diff --git a/src/qt/forms/sendcoinsentry.ui b/src/qt/forms/sendcoinsentry.ui
index 74e25f87a..8e136521c 100644
--- a/src/qt/forms/sendcoinsentry.ui
+++ b/src/qt/forms/sendcoinsentry.ui
@@ -1,1276 +1,1283 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
  <class>SendCoinsEntry</class>
  <widget class="QStackedWidget" name="SendCoinsEntry">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>729</width>
     <height>150</height>
    </rect>
   </property>
   <property name="focusPolicy">
    <enum>Qt::TabFocus</enum>
   </property>
   <property name="autoFillBackground">
    <bool>false</bool>
   </property>
   <widget class="QFrame" name="SendCoins">
    <property name="toolTip">
     <string>This is a normal payment.</string>
    </property>
    <property name="frameShape">
     <enum>QFrame::NoFrame</enum>
    </property>
    <layout class="QGridLayout" name="gridLayout">
     <property name="topMargin">
      <number>8</number>
     </property>
     <property name="bottomMargin">
      <number>4</number>
     </property>
     <property name="horizontalSpacing">
      <number>12</number>
     </property>
     <property name="verticalSpacing">
      <number>8</number>
     </property>
     <item row="0" column="0">
      <widget class="QLabel" name="payToLabel">
       <property name="text">
        <string>Pay &amp;To:</string>
       </property>
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
       <property name="buddy">
        <cstring>payTo</cstring>
       </property>
      </widget>
     </item>
     <item row="0" column="1">
      <layout class="QHBoxLayout" name="payToLayout">
       <property name="spacing">
        <number>0</number>
       </property>
       <item>
        <widget class="QValidatedLineEdit" name="payTo">
         <property name="toolTip">
          <string>The Bitcoin address to send the payment to</string>
         </property>
        </widget>
       </item>
       <item>
        <widget class="QToolButton" name="addressBookButton">
         <property name="toolTip">
          <string>Choose previously used address</string>
         </property>
         <property name="text">
          <string/>
         </property>
         <property name="icon">
          <iconset resource="../bitcoin.qrc">
           <normaloff>:/icons/address-book</normaloff>:/icons/address-book</iconset>
         </property>
         <property name="iconSize">
          <size>
           <width>22</width>
           <height>22</height>
          </size>
         </property>
         <property name="shortcut">
          <string>Alt+A</string>
         </property>
        </widget>
       </item>
       <item>
        <widget class="QToolButton" name="pasteButton">
         <property name="toolTip">
          <string>Paste address from clipboard</string>
         </property>
         <property name="text">
          <string/>
         </property>
         <property name="icon">
          <iconset resource="../bitcoin.qrc">
           <normaloff>:/icons/editpaste</normaloff>:/icons/editpaste</iconset>
         </property>
         <property name="iconSize">
          <size>
           <width>22</width>
           <height>22</height>
          </size>
         </property>
         <property name="shortcut">
          <string>Alt+P</string>
         </property>
        </widget>
       </item>
       <item>
        <widget class="QToolButton" name="deleteButton">
         <property name="toolTip">
          <string>Remove this entry</string>
         </property>
         <property name="text">
          <string/>
         </property>
         <property name="icon">
          <iconset resource="../bitcoin.qrc">
           <normaloff>:/icons/remove</normaloff>:/icons/remove</iconset>
         </property>
         <property name="iconSize">
          <size>
           <width>22</width>
           <height>22</height>
          </size>
         </property>
        </widget>
       </item>
      </layout>
     </item>
     <item row="1" column="0">
      <widget class="QLabel" name="labellLabel">
       <property name="text">
        <string>&amp;Label:</string>
       </property>
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
       <property name="buddy">
        <cstring>addAsLabel</cstring>
       </property>
      </widget>
     </item>
     <item row="1" column="1">
      <widget class="QLineEdit" name="addAsLabel">
       <property name="toolTip">
        <string>Enter a label for this address to add it to the list of used addresses</string>
       </property>
      </widget>
     </item>
     <item row="2" column="0">
      <widget class="QLabel" name="amountLabel">
       <property name="text">
        <string>A&amp;mount:</string>
       </property>
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
       <property name="buddy">
        <cstring>payAmount</cstring>
       </property>
      </widget>
     </item>
     <item row="2" column="1">
-     <layout class="QHBoxLayout" name="horizontalLayoutAmount" stretch="0,1">
+     <layout class="QHBoxLayout" name="horizontalLayoutAmount" stretch="0,1,0">
       <item>
        <widget class="BitcoinAmountField" name="payAmount"/>
       </item>
       <item>
        <widget class="QCheckBox" name="checkboxSubtractFeeFromAmount">
         <property name="toolTip">
          <string>The fee will be deducted from the amount being sent. The recipient will receive less bitcoins than you enter in the amount field. If multiple recipients are selected, the fee is split equally.</string>
         </property>
         <property name="text">
          <string>S&amp;ubtract fee from amount</string>
         </property>
        </widget>
       </item>
+      <item>
+       <widget class="QPushButton" name="useAvailableBalanceButton">
+        <property name="text">
+         <string>Use available balance</string>
+        </property>
+       </widget>
+      </item>
      </layout>
     </item>
     <item row="3" column="0">
      <widget class="QLabel" name="messageLabel">
       <property name="text">
        <string>Message:</string>
       </property>
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
      </widget>
     </item>
     <item row="3" column="1">
      <widget class="QLabel" name="messageTextLabel">
       <property name="toolTip">
        <string/>
       </property>
       <property name="textFormat">
        <enum>Qt::PlainText</enum>
       </property>
      </widget>
     </item>
     <item row="4" column="0" colspan="2">
      <widget class="Line" name="line">
       <property name="orientation">
        <enum>Qt::Horizontal</enum>
       </property>
      </widget>
     </item>
    </layout>
   </widget>
   <widget class="QFrame" name="SendCoins_UnauthenticatedPaymentRequest">
    <property name="palette">
     <palette>
      <active>
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      </disabled>
     </palette>
    </property>
    <property name="toolTip">
     <string>This is an unauthenticated payment request.</string>
    </property>
    <property name="autoFillBackground">
     <bool>true</bool>
    </property>
    <property name="frameShape">
     <enum>QFrame::NoFrame</enum>
    </property>
    <layout class="QGridLayout" name="gridLayout_is">
     <property name="spacing">
      <number>12</number>
     </property>
     <item row="0" column="0">
      <widget class="QLabel" name="payToLabel_is">
       <property name="text">
        <string>Pay To:</string>
       </property>
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
      </widget>
     </item>
     <item row="0" column="1">
      <layout class="QHBoxLayout" name="payToLayout_is">
       <property name="spacing">
        <number>0</number>
       </property>
       <item>
        <widget class="QLabel" name="payTo_is"/>
       </item>
       <item>
        <widget class="QToolButton" name="deleteButton_is">
         <property name="toolTip">
          <string>Remove this entry</string>
         </property>
         <property name="text">
          <string/>
         </property>
         <property name="icon">
          <iconset resource="../bitcoin.qrc">
           <normaloff>:/icons/remove</normaloff>:/icons/remove</iconset>
         </property>
        </widget>
       </item>
      </layout>
     </item>
     <item row="1" column="0">
      <widget class="QLabel" name="memoLabel_is">
       <property name="text">
        <string>Memo:</string>
       </property>
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
      </widget>
     </item>
     <item row="1" column="1">
      <widget class="QLabel" name="memoTextLabel_is">
       <property name="textFormat">
        <enum>Qt::PlainText</enum>
       </property>
      </widget>
     </item>
     <item row="2" column="0">
      <widget class="QLabel" name="amountLabel_is">
       <property name="text">
        <string>A&amp;mount:</string>
       </property>
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
       <property name="buddy">
        <cstring>payAmount_is</cstring>
       </property>
      </widget>
     </item>
     <item row="2" column="1">
      <widget class="BitcoinAmountField" name="payAmount_is">
       <property name="acceptDrops">
        <bool>false</bool>
       </property>
      </widget>
     </item>
    </layout>
   </widget>
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        </brush>
       </colorrole>
      </active>
      <inactive>
       <colorrole role="WindowText">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>0</red>
          <green>0</green>
          <blue>0</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Button">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>140</red>
          <green>232</green>
          <blue>119</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Light">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>230</red>
          <green>255</green>
          <blue>224</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Midlight">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>185</red>
          <green>243</green>
          <blue>171</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Dark">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>70</red>
          <green>116</green>
          <blue>59</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Mid">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>93</red>
          <green>155</green>
          <blue>79</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Text">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>0</red>
          <green>0</green>
          <blue>0</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="BrightText">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>155</red>
          <green>255</green>
          <blue>147</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="ButtonText">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>0</red>
          <green>0</green>
          <blue>0</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Base">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>119</red>
          <green>255</green>
          <blue>233</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Window">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>140</red>
          <green>232</green>
          <blue>119</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Shadow">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>0</red>
          <green>0</green>
          <blue>0</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="AlternateBase">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>197</red>
          <green>243</green>
          <blue>187</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="NoRole">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>125</red>
          <green>194</green>
          <blue>122</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="ToolTipBase">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>255</red>
          <green>255</green>
          <blue>220</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="ToolTipText">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>0</red>
          <green>0</green>
          <blue>0</blue>
         </color>
        </brush>
       </colorrole>
      </inactive>
      <disabled>
       <colorrole role="WindowText">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>70</red>
          <green>116</green>
          <blue>59</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Button">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>140</red>
          <green>232</green>
          <blue>119</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Light">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>230</red>
          <green>255</green>
          <blue>224</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Midlight">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>185</red>
          <green>243</green>
          <blue>171</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Dark">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>70</red>
          <green>116</green>
          <blue>59</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Mid">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>93</red>
          <green>155</green>
          <blue>79</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Text">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>70</red>
          <green>116</green>
          <blue>59</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="BrightText">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>155</red>
          <green>255</green>
          <blue>147</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="ButtonText">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>70</red>
          <green>116</green>
          <blue>59</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Base">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>140</red>
          <green>232</green>
          <blue>119</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Window">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>140</red>
          <green>232</green>
          <blue>119</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="Shadow">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>0</red>
          <green>0</green>
          <blue>0</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="AlternateBase">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>140</red>
          <green>232</green>
          <blue>119</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="NoRole">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>125</red>
          <green>194</green>
          <blue>122</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="ToolTipBase">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>255</red>
          <green>255</green>
          <blue>220</blue>
         </color>
        </brush>
       </colorrole>
       <colorrole role="ToolTipText">
        <brush brushstyle="SolidPattern">
         <color alpha="255">
          <red>0</red>
          <green>0</green>
          <blue>0</blue>
         </color>
        </brush>
       </colorrole>
      </disabled>
     </palette>
    </property>
    <property name="toolTip">
     <string>This is an authenticated payment request.</string>
    </property>
    <property name="autoFillBackground">
     <bool>true</bool>
    </property>
    <property name="frameShape">
     <enum>QFrame::NoFrame</enum>
    </property>
    <layout class="QGridLayout" name="gridLayout_s">
     <property name="spacing">
      <number>12</number>
     </property>
     <item row="0" column="0">
      <widget class="QLabel" name="payToLabel_s">
       <property name="text">
        <string>Pay To:</string>
       </property>
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
      </widget>
     </item>
     <item row="0" column="1">
      <layout class="QHBoxLayout" name="payToLayout_s">
       <property name="spacing">
        <number>0</number>
       </property>
       <item>
        <widget class="QLabel" name="payTo_s">
         <property name="textFormat">
          <enum>Qt::PlainText</enum>
         </property>
        </widget>
       </item>
       <item>
        <widget class="QToolButton" name="deleteButton_s">
         <property name="toolTip">
          <string>Remove this entry</string>
         </property>
         <property name="text">
          <string/>
         </property>
         <property name="icon">
          <iconset resource="../bitcoin.qrc">
           <normaloff>:/icons/remove</normaloff>:/icons/remove</iconset>
         </property>
        </widget>
       </item>
      </layout>
     </item>
     <item row="1" column="0">
      <widget class="QLabel" name="memoLabel_s">
       <property name="text">
        <string>Memo:</string>
       </property>
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
      </widget>
     </item>
     <item row="1" column="1">
      <widget class="QLabel" name="memoTextLabel_s">
       <property name="textFormat">
        <enum>Qt::PlainText</enum>
       </property>
      </widget>
     </item>
     <item row="2" column="0">
      <widget class="QLabel" name="amountLabel_s">
       <property name="text">
        <string>A&amp;mount:</string>
       </property>
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
       <property name="buddy">
        <cstring>payAmount_s</cstring>
       </property>
      </widget>
     </item>
     <item row="2" column="1">
      <widget class="BitcoinAmountField" name="payAmount_s">
       <property name="acceptDrops">
        <bool>false</bool>
       </property>
      </widget>
     </item>
    </layout>
   </widget>
  </widget>
  <customwidgets>
   <customwidget>
    <class>QValidatedLineEdit</class>
    <extends>QLineEdit</extends>
    <header>qvalidatedlineedit.h</header>
   </customwidget>
   <customwidget>
    <class>BitcoinAmountField</class>
    <extends>QLineEdit</extends>
    <header>bitcoinamountfield.h</header>
    <container>1</container>
   </customwidget>
  </customwidgets>
  <tabstops>
   <tabstop>payTo</tabstop>
   <tabstop>addressBookButton</tabstop>
   <tabstop>pasteButton</tabstop>
   <tabstop>deleteButton</tabstop>
   <tabstop>addAsLabel</tabstop>
   <tabstop>payAmount</tabstop>
   <tabstop>payAmount_is</tabstop>
   <tabstop>deleteButton_is</tabstop>
   <tabstop>payAmount_s</tabstop>
   <tabstop>deleteButton_s</tabstop>
  </tabstops>
  <resources>
   <include location="../bitcoin.qrc"/>
  </resources>
  <connections/>
 </ui>
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 659848ac7..23ba782f4 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -1,972 +1,999 @@
 // Copyright (c) 2011-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "sendcoinsdialog.h"
 #include "ui_sendcoinsdialog.h"
 
 #include "addresstablemodel.h"
 #include "bitcoinunits.h"
 #include "clientmodel.h"
 #include "coincontroldialog.h"
 #include "guiutil.h"
 #include "optionsmodel.h"
 #include "platformstyle.h"
 #include "sendcoinsentry.h"
 #include "walletmodel.h"
 
 #include "chainparams.h"
 #include "dstencode.h"
 #include "txmempool.h"
 #include "ui_interface.h"
 #include "validation.h" // mempool and minRelayTxFee
 #include "wallet/coincontrol.h"
 #include "wallet/wallet.h"
 
 #include <QMessageBox>
 #include <QScrollBar>
 #include <QSettings>
 #include <QTextDocument>
 #include <QTimer>
 
 #define SEND_CONFIRM_DELAY 3
 
 SendCoinsDialog::SendCoinsDialog(const PlatformStyle *_platformStyle,
                                  QWidget *parent)
     : QDialog(parent), ui(new Ui::SendCoinsDialog), clientModel(0), model(0),
       fNewRecipientAllowed(true), fFeeMinimized(true),
       platformStyle(_platformStyle) {
     ui->setupUi(this);
 
     if (!_platformStyle->getImagesOnButtons()) {
         ui->addButton->setIcon(QIcon());
         ui->clearButton->setIcon(QIcon());
         ui->sendButton->setIcon(QIcon());
     } else {
         ui->addButton->setIcon(_platformStyle->SingleColorIcon(":/icons/add"));
         ui->clearButton->setIcon(
             _platformStyle->SingleColorIcon(":/icons/remove"));
         ui->sendButton->setIcon(
             _platformStyle->SingleColorIcon(":/icons/send"));
     }
 
     GUIUtil::setupAddressWidget(ui->lineEditCoinControlChange, this);
 
     addEntry();
 
     connect(ui->addButton, SIGNAL(clicked()), this, SLOT(addEntry()));
     connect(ui->clearButton, SIGNAL(clicked()), this, SLOT(clear()));
 
     // Coin Control
     connect(ui->pushButtonCoinControl, SIGNAL(clicked()), this,
             SLOT(coinControlButtonClicked()));
     connect(ui->checkBoxCoinControlChange, SIGNAL(stateChanged(int)), this,
             SLOT(coinControlChangeChecked(int)));
     connect(ui->lineEditCoinControlChange, SIGNAL(textEdited(const QString &)),
             this, SLOT(coinControlChangeEdited(const QString &)));
 
     // Coin Control: clipboard actions
     QAction *clipboardQuantityAction = new QAction(tr("Copy quantity"), this);
     QAction *clipboardAmountAction = new QAction(tr("Copy amount"), this);
     QAction *clipboardFeeAction = new QAction(tr("Copy fee"), this);
     QAction *clipboardAfterFeeAction = new QAction(tr("Copy after fee"), this);
     QAction *clipboardBytesAction = new QAction(tr("Copy bytes"), this);
     QAction *clipboardLowOutputAction = new QAction(tr("Copy dust"), this);
     QAction *clipboardChangeAction = new QAction(tr("Copy change"), this);
     connect(clipboardQuantityAction, SIGNAL(triggered()), this,
             SLOT(coinControlClipboardQuantity()));
     connect(clipboardAmountAction, SIGNAL(triggered()), this,
             SLOT(coinControlClipboardAmount()));
     connect(clipboardFeeAction, SIGNAL(triggered()), this,
             SLOT(coinControlClipboardFee()));
     connect(clipboardAfterFeeAction, SIGNAL(triggered()), this,
             SLOT(coinControlClipboardAfterFee()));
     connect(clipboardBytesAction, SIGNAL(triggered()), this,
             SLOT(coinControlClipboardBytes()));
     connect(clipboardLowOutputAction, SIGNAL(triggered()), this,
             SLOT(coinControlClipboardLowOutput()));
     connect(clipboardChangeAction, SIGNAL(triggered()), this,
             SLOT(coinControlClipboardChange()));
     ui->labelCoinControlQuantity->addAction(clipboardQuantityAction);
     ui->labelCoinControlAmount->addAction(clipboardAmountAction);
     ui->labelCoinControlFee->addAction(clipboardFeeAction);
     ui->labelCoinControlAfterFee->addAction(clipboardAfterFeeAction);
     ui->labelCoinControlBytes->addAction(clipboardBytesAction);
     ui->labelCoinControlLowOutput->addAction(clipboardLowOutputAction);
     ui->labelCoinControlChange->addAction(clipboardChangeAction);
 
     // init transaction fee section
     QSettings settings;
     if (!settings.contains("fFeeSectionMinimized"))
         settings.setValue("fFeeSectionMinimized", true);
     // compatibility
     if (!settings.contains("nFeeRadio") &&
         settings.contains("nTransactionFee") &&
         settings.value("nTransactionFee").toLongLong() > 0) {
         // custom
         settings.setValue("nFeeRadio", 1);
     }
     if (!settings.contains("nFeeRadio")) {
         // recommended
         settings.setValue("nFeeRadio", 0);
     }
     // compatibility
     if (!settings.contains("nCustomFeeRadio") &&
         settings.contains("nTransactionFee") &&
         settings.value("nTransactionFee").toLongLong() > 0) {
         // total at least
         settings.setValue("nCustomFeeRadio", 1);
     }
     if (!settings.contains("nCustomFeeRadio")) {
         // per kilobyte
         settings.setValue("nCustomFeeRadio", 0);
     }
     if (!settings.contains("nSmartFeeSliderPosition"))
         settings.setValue("nSmartFeeSliderPosition", 0);
     if (!settings.contains("nTransactionFee"))
         settings.setValue("nTransactionFee",
                           qint64(DEFAULT_TRANSACTION_FEE / SATOSHI));
     if (!settings.contains("fPayOnlyMinFee"))
         settings.setValue("fPayOnlyMinFee", false);
     ui->groupFee->setId(ui->radioSmartFee, 0);
     ui->groupFee->setId(ui->radioCustomFee, 1);
     ui->groupFee
         ->button(
             std::max<int>(0, std::min(1, settings.value("nFeeRadio").toInt())))
         ->setChecked(true);
     ui->groupCustomFee->setId(ui->radioCustomPerKilobyte, 0);
     ui->groupCustomFee->setId(ui->radioCustomAtLeast, 1);
     ui->groupCustomFee
         ->button(std::max<int>(
             0, std::min(1, settings.value("nCustomFeeRadio").toInt())))
         ->setChecked(true);
     ui->customFee->setValue(
         int64_t(settings.value("nTransactionFee").toLongLong()) * SATOSHI);
     ui->checkBoxMinimumFee->setChecked(
         settings.value("fPayOnlyMinFee").toBool());
     minimizeFeeSection(settings.value("fFeeSectionMinimized").toBool());
 }
 
 void SendCoinsDialog::setClientModel(ClientModel *_clientModel) {
     this->clientModel = _clientModel;
 
     if (_clientModel) {
         connect(_clientModel,
                 SIGNAL(numBlocksChanged(int, QDateTime, double, bool)), this,
                 SLOT(updateSmartFeeLabel()));
     }
 }
 
 void SendCoinsDialog::setModel(WalletModel *_model) {
     this->model = _model;
 
     if (_model && _model->getOptionsModel()) {
         for (int i = 0; i < ui->entries->count(); ++i) {
             SendCoinsEntry *entry = qobject_cast<SendCoinsEntry *>(
                 ui->entries->itemAt(i)->widget());
             if (entry) {
                 entry->setModel(_model);
             }
         }
 
         setBalance(_model->getBalance(), _model->getUnconfirmedBalance(),
                    _model->getImmatureBalance(), _model->getWatchBalance(),
                    _model->getWatchUnconfirmedBalance(),
                    _model->getWatchImmatureBalance());
         connect(_model, SIGNAL(balanceChanged(Amount, Amount, Amount, Amount,
                                               Amount, Amount)),
                 this, SLOT(setBalance(Amount, Amount, Amount, Amount, Amount,
                                       Amount)));
         connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)),
                 this, SLOT(updateDisplayUnit()));
         updateDisplayUnit();
 
         // Coin Control
         connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)),
                 this, SLOT(coinControlUpdateLabels()));
         connect(_model->getOptionsModel(),
                 SIGNAL(coinControlFeaturesChanged(bool)), this,
                 SLOT(coinControlFeatureChanged(bool)));
         ui->frameCoinControl->setVisible(
             _model->getOptionsModel()->getCoinControlFeatures());
         coinControlUpdateLabels();
 
         // fee section
         connect(ui->sliderSmartFee, SIGNAL(valueChanged(int)), this,
                 SLOT(updateSmartFeeLabel()));
         connect(ui->sliderSmartFee, SIGNAL(valueChanged(int)), this,
                 SLOT(updateGlobalFeeVariables()));
         connect(ui->sliderSmartFee, SIGNAL(valueChanged(int)), this,
                 SLOT(coinControlUpdateLabels()));
         connect(ui->groupFee, SIGNAL(buttonClicked(int)), this,
                 SLOT(updateFeeSectionControls()));
         connect(ui->groupFee, SIGNAL(buttonClicked(int)), this,
                 SLOT(updateGlobalFeeVariables()));
         connect(ui->groupFee, SIGNAL(buttonClicked(int)), this,
                 SLOT(coinControlUpdateLabels()));
         connect(ui->groupCustomFee, SIGNAL(buttonClicked(int)), this,
                 SLOT(updateGlobalFeeVariables()));
         connect(ui->groupCustomFee, SIGNAL(buttonClicked(int)), this,
                 SLOT(coinControlUpdateLabels()));
         connect(ui->customFee, SIGNAL(valueChanged()), this,
                 SLOT(updateGlobalFeeVariables()));
         connect(ui->customFee, SIGNAL(valueChanged()), this,
                 SLOT(coinControlUpdateLabels()));
         connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this,
                 SLOT(setMinimumFee()));
         connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this,
                 SLOT(updateFeeSectionControls()));
         connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this,
                 SLOT(updateGlobalFeeVariables()));
         connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this,
                 SLOT(coinControlUpdateLabels()));
         ui->customFee->setSingleStep(CWallet::GetRequiredFee(1000));
         updateFeeSectionControls();
         updateMinFeeLabel();
         updateSmartFeeLabel();
         updateGlobalFeeVariables();
 
         // set the smartfee-sliders default value (wallets default conf.target
         // or last stored value)
         QSettings settings;
         if (settings.value("nSmartFeeSliderPosition").toInt() == 0)
             ui->sliderSmartFee->setValue(ui->sliderSmartFee->maximum() -
                                          model->getDefaultConfirmTarget() + 2);
         else
             ui->sliderSmartFee->setValue(
                 settings.value("nSmartFeeSliderPosition").toInt());
     }
 }
 
 SendCoinsDialog::~SendCoinsDialog() {
     QSettings settings;
     settings.setValue("fFeeSectionMinimized", fFeeMinimized);
     settings.setValue("nFeeRadio", ui->groupFee->checkedId());
     settings.setValue("nCustomFeeRadio", ui->groupCustomFee->checkedId());
     settings.setValue("nSmartFeeSliderPosition", ui->sliderSmartFee->value());
     settings.setValue("nTransactionFee",
                       qint64(ui->customFee->value() / SATOSHI));
     settings.setValue("fPayOnlyMinFee", ui->checkBoxMinimumFee->isChecked());
 
     delete ui;
 }
 
 void SendCoinsDialog::on_sendButton_clicked() {
     if (!model || !model->getOptionsModel()) return;
 
     QList<SendCoinsRecipient> recipients;
     bool valid = true;
 
     for (int i = 0; i < ui->entries->count(); ++i) {
         SendCoinsEntry *entry =
             qobject_cast<SendCoinsEntry *>(ui->entries->itemAt(i)->widget());
         if (entry) {
             if (entry->validate()) {
                 recipients.append(entry->getValue());
             } else {
                 valid = false;
             }
         }
     }
 
     if (!valid || recipients.isEmpty()) {
         return;
     }
 
     fNewRecipientAllowed = false;
     WalletModel::UnlockContext ctx(model->requestUnlock());
     if (!ctx.isValid()) {
         // Unlock wallet was cancelled
         fNewRecipientAllowed = true;
         return;
     }
 
     // prepare transaction for getting txFee earlier
     WalletModelTransaction currentTransaction(recipients);
     WalletModel::SendCoinsReturn prepareStatus;
 
     // Always use a CCoinControl instance, use the CoinControlDialog instance if
     // CoinControl has been enabled
     CCoinControl ctrl;
     if (model->getOptionsModel()->getCoinControlFeatures())
         ctrl = *CoinControlDialog::coinControl;
     if (ui->radioSmartFee->isChecked())
         ctrl.nConfirmTarget =
             ui->sliderSmartFee->maximum() - ui->sliderSmartFee->value() + 2;
     else
         ctrl.nConfirmTarget = 0;
 
     prepareStatus = model->prepareTransaction(currentTransaction, &ctrl);
 
     // process prepareStatus and on error generate message shown to user
     processSendCoinsReturn(
         prepareStatus,
         BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(),
                                      currentTransaction.getTransactionFee()));
 
     if (prepareStatus.status != WalletModel::OK) {
         fNewRecipientAllowed = true;
         return;
     }
 
     Amount txFee = currentTransaction.getTransactionFee();
 
     // Format confirmation message
     QStringList formatted;
     for (const SendCoinsRecipient &rcp : currentTransaction.getRecipients()) {
         // generate bold amount string
         QString amount =
             "<b>" + BitcoinUnits::formatHtmlWithUnit(
                         model->getOptionsModel()->getDisplayUnit(), rcp.amount);
         amount.append("</b>");
         // generate monospace address string
         QString address =
             "<span style='font-family: monospace;'>" + rcp.address;
         address.append("</span>");
 
         QString recipientElement;
 
         // normal payment
         if (!rcp.paymentRequest.IsInitialized()) {
             if (rcp.label.length() > 0) {
                 // label with address
                 recipientElement =
                     tr("%1 to %2").arg(amount, GUIUtil::HtmlEscape(rcp.label));
                 recipientElement.append(QString(" (%1)").arg(address));
             } else {
                 // just address
                 recipientElement = tr("%1 to %2").arg(amount, address);
             }
         } else if (!rcp.authenticatedMerchant.isEmpty()) {
             // authenticated payment request
             recipientElement =
                 tr("%1 to %2")
                     .arg(amount,
                          GUIUtil::HtmlEscape(rcp.authenticatedMerchant));
         } else {
             // unauthenticated payment request
             recipientElement = tr("%1 to %2").arg(amount, address);
         }
 
         formatted.append(recipientElement);
     }
 
     QString questionString = tr("Are you sure you want to send?");
     questionString.append("<br /><br />%1");
 
     if (txFee > Amount::zero()) {
         // append fee string if a fee is required
         questionString.append("<hr /><span style='color:#aa0000;'>");
         questionString.append(BitcoinUnits::formatHtmlWithUnit(
             model->getOptionsModel()->getDisplayUnit(), txFee));
         questionString.append("</span> ");
         questionString.append(tr("added as transaction fee"));
 
         // append transaction size
         questionString.append(
             " (" + QString::number(
                        (double)currentTransaction.getTransactionSize() / 1000) +
             " kB)");
     }
 
     // add total amount in all subdivision units
     questionString.append("<hr />");
     Amount totalAmount = currentTransaction.getTotalTransactionAmount() + txFee;
     QStringList alternativeUnits;
     for (BitcoinUnits::Unit u : BitcoinUnits::availableUnits()) {
         if (u != model->getOptionsModel()->getDisplayUnit())
             alternativeUnits.append(
                 BitcoinUnits::formatHtmlWithUnit(u, totalAmount));
     }
     questionString.append(
         tr("Total Amount %1")
             .arg(BitcoinUnits::formatHtmlWithUnit(
                 model->getOptionsModel()->getDisplayUnit(), totalAmount)));
     questionString.append(
         QString("<span style='font-size:10pt;font-weight:normal;'><br "
                 "/>(=%2)</span>")
             .arg(alternativeUnits.join(" " + tr("or") + "<br />")));
 
     SendConfirmationDialog confirmationDialog(
         tr("Confirm send coins"), questionString.arg(formatted.join("<br />")),
         SEND_CONFIRM_DELAY, this);
     confirmationDialog.exec();
     QMessageBox::StandardButton retval =
         (QMessageBox::StandardButton)confirmationDialog.result();
 
     if (retval != QMessageBox::Yes) {
         fNewRecipientAllowed = true;
         return;
     }
 
     // now send the prepared transaction
     WalletModel::SendCoinsReturn sendStatus =
         model->sendCoins(currentTransaction);
     // process sendStatus and on error generate message shown to user
     processSendCoinsReturn(sendStatus);
 
     if (sendStatus.status == WalletModel::OK) {
         accept();
         CoinControlDialog::coinControl->UnSelectAll();
         coinControlUpdateLabels();
     }
     fNewRecipientAllowed = true;
 }
 
 void SendCoinsDialog::clear() {
     // Remove entries until only one left
     while (ui->entries->count()) {
         ui->entries->takeAt(0)->widget()->deleteLater();
     }
     addEntry();
 
     updateTabsAndLabels();
 }
 
 void SendCoinsDialog::reject() {
     clear();
 }
 
 void SendCoinsDialog::accept() {
     clear();
 }
 
 SendCoinsEntry *SendCoinsDialog::addEntry() {
     SendCoinsEntry *entry = new SendCoinsEntry(platformStyle, this);
     entry->setModel(model);
     ui->entries->addWidget(entry);
     connect(entry, SIGNAL(removeEntry(SendCoinsEntry *)), this,
             SLOT(removeEntry(SendCoinsEntry *)));
+    connect(entry, SIGNAL(useAvailableBalance(SendCoinsEntry *)), this,
+            SLOT(useAvailableBalance(SendCoinsEntry *)));
     connect(entry, SIGNAL(payAmountChanged()), this,
             SLOT(coinControlUpdateLabels()));
     connect(entry, SIGNAL(subtractFeeFromAmountChanged()), this,
             SLOT(coinControlUpdateLabels()));
 
     // Focus the field, so that entry can start immediately
     entry->clear();
     entry->setFocus();
     ui->scrollAreaWidgetContents->resize(
         ui->scrollAreaWidgetContents->sizeHint());
     qApp->processEvents();
     QScrollBar *bar = ui->scrollArea->verticalScrollBar();
     if (bar) bar->setSliderPosition(bar->maximum());
 
     updateTabsAndLabels();
     return entry;
 }
 
 void SendCoinsDialog::updateTabsAndLabels() {
     setupTabChain(0);
     coinControlUpdateLabels();
 }
 
 void SendCoinsDialog::removeEntry(SendCoinsEntry *entry) {
     entry->hide();
 
     // If the last entry is about to be removed add an empty one
     if (ui->entries->count() == 1) addEntry();
 
     entry->deleteLater();
 
     updateTabsAndLabels();
 }
 
 QWidget *SendCoinsDialog::setupTabChain(QWidget *prev) {
     for (int i = 0; i < ui->entries->count(); ++i) {
         SendCoinsEntry *entry =
             qobject_cast<SendCoinsEntry *>(ui->entries->itemAt(i)->widget());
         if (entry) {
             prev = entry->setupTabChain(prev);
         }
     }
     QWidget::setTabOrder(prev, ui->sendButton);
     QWidget::setTabOrder(ui->sendButton, ui->clearButton);
     QWidget::setTabOrder(ui->clearButton, ui->addButton);
     return ui->addButton;
 }
 
 void SendCoinsDialog::setAddress(const QString &address) {
     SendCoinsEntry *entry = 0;
     // Replace the first entry if it is still unused
     if (ui->entries->count() == 1) {
         SendCoinsEntry *first =
             qobject_cast<SendCoinsEntry *>(ui->entries->itemAt(0)->widget());
         if (first->isClear()) {
             entry = first;
         }
     }
     if (!entry) {
         entry = addEntry();
     }
 
     entry->setAddress(address);
 }
 
 void SendCoinsDialog::pasteEntry(const SendCoinsRecipient &rv) {
     if (!fNewRecipientAllowed) return;
 
     SendCoinsEntry *entry = 0;
     // Replace the first entry if it is still unused
     if (ui->entries->count() == 1) {
         SendCoinsEntry *first =
             qobject_cast<SendCoinsEntry *>(ui->entries->itemAt(0)->widget());
         if (first->isClear()) {
             entry = first;
         }
     }
     if (!entry) {
         entry = addEntry();
     }
 
     entry->setValue(rv);
     updateTabsAndLabels();
 }
 
 bool SendCoinsDialog::handlePaymentRequest(const SendCoinsRecipient &rv) {
     // Just paste the entry, all pre-checks are done in paymentserver.cpp.
     pasteEntry(rv);
     return true;
 }
 
 void SendCoinsDialog::setBalance(const Amount balance,
                                  const Amount unconfirmedBalance,
                                  const Amount immatureBalance,
                                  const Amount watchBalance,
                                  const Amount watchUnconfirmedBalance,
                                  const Amount watchImmatureBalance) {
     Q_UNUSED(unconfirmedBalance);
     Q_UNUSED(immatureBalance);
     Q_UNUSED(watchBalance);
     Q_UNUSED(watchUnconfirmedBalance);
     Q_UNUSED(watchImmatureBalance);
 
     if (model && model->getOptionsModel()) {
         ui->labelBalance->setText(BitcoinUnits::formatWithUnit(
             model->getOptionsModel()->getDisplayUnit(), balance));
     }
 }
 
 void SendCoinsDialog::updateDisplayUnit() {
     setBalance(model->getBalance(), Amount::zero(), Amount::zero(),
                Amount::zero(), Amount::zero(), Amount::zero());
     ui->customFee->setDisplayUnit(model->getOptionsModel()->getDisplayUnit());
     updateMinFeeLabel();
     updateSmartFeeLabel();
 }
 
 void SendCoinsDialog::processSendCoinsReturn(
     const WalletModel::SendCoinsReturn &sendCoinsReturn,
     const QString &msgArg) {
     QPair<QString, CClientUIInterface::MessageBoxFlags> msgParams;
     // Default to a warning message, override if error message is needed
     msgParams.second = CClientUIInterface::MSG_WARNING;
 
     // This comment is specific to SendCoinsDialog usage of
     // WalletModel::SendCoinsReturn.
     // WalletModel::TransactionCommitFailed is used only in
     // WalletModel::sendCoins() all others are used only in
     // WalletModel::prepareTransaction()
     switch (sendCoinsReturn.status) {
         case WalletModel::InvalidAddress:
             msgParams.first =
                 tr("The recipient address is not valid. Please recheck.");
             break;
         case WalletModel::InvalidAmount:
             msgParams.first = tr("The amount to pay must be larger than 0.");
             break;
         case WalletModel::AmountExceedsBalance:
             msgParams.first = tr("The amount exceeds your balance.");
             break;
         case WalletModel::AmountWithFeeExceedsBalance:
             msgParams.first = tr("The total exceeds your balance when the %1 "
                                  "transaction fee is included.")
                                   .arg(msgArg);
             break;
         case WalletModel::DuplicateAddress:
             msgParams.first = tr("Duplicate address found: addresses should "
                                  "only be used once each.");
             break;
         case WalletModel::TransactionCreationFailed:
             msgParams.first = tr("Transaction creation failed!");
             msgParams.second = CClientUIInterface::MSG_ERROR;
             break;
         case WalletModel::TransactionCommitFailed:
             msgParams.first =
                 tr("The transaction was rejected with the following reason: %1")
                     .arg(sendCoinsReturn.reasonCommitFailed);
             msgParams.second = CClientUIInterface::MSG_ERROR;
             break;
         case WalletModel::AbsurdFee:
             msgParams.first =
                 tr("A fee higher than %1 is considered an absurdly high fee.")
                     .arg(BitcoinUnits::formatWithUnit(
                         model->getOptionsModel()->getDisplayUnit(), maxTxFee));
             break;
         case WalletModel::PaymentRequestExpired:
             msgParams.first = tr("Payment request expired.");
             msgParams.second = CClientUIInterface::MSG_ERROR;
             break;
         // included to prevent a compiler warning.
         case WalletModel::OK:
         default:
             return;
     }
 
     Q_EMIT message(tr("Send Coins"), msgParams.first, msgParams.second);
 }
 
 void SendCoinsDialog::minimizeFeeSection(bool fMinimize) {
     ui->labelFeeMinimized->setVisible(fMinimize);
     ui->buttonChooseFee->setVisible(fMinimize);
     ui->buttonMinimizeFee->setVisible(!fMinimize);
     ui->frameFeeSelection->setVisible(!fMinimize);
     ui->horizontalLayoutSmartFee->setContentsMargins(0, (fMinimize ? 0 : 6), 0,
                                                      0);
     fFeeMinimized = fMinimize;
 }
 
 void SendCoinsDialog::on_buttonChooseFee_clicked() {
     minimizeFeeSection(false);
 }
 
 void SendCoinsDialog::on_buttonMinimizeFee_clicked() {
     updateFeeMinimizedLabel();
     minimizeFeeSection(true);
 }
 
+void SendCoinsDialog::useAvailableBalance(SendCoinsEntry *entry) {
+    // Get CCoinControl instance if CoinControl is enabled or create a new one.
+    CCoinControl coin_control;
+    if (model->getOptionsModel()->getCoinControlFeatures()) {
+        coin_control = *CoinControlDialog::coinControl;
+    }
+
+    // Calculate available amount to send.
+    Amount amount = model->getBalance(&coin_control);
+    for (int i = 0; i < ui->entries->count(); ++i) {
+        SendCoinsEntry *e =
+            qobject_cast<SendCoinsEntry *>(ui->entries->itemAt(i)->widget());
+        if (e && !e->isHidden() && e != entry) {
+            amount -= e->getValue().amount;
+        }
+    }
+
+    if (amount > Amount::zero()) {
+        entry->checkSubtractFeeFromAmount();
+        entry->setAmount(amount);
+    } else {
+        entry->setAmount(Amount::zero());
+    }
+}
+
 void SendCoinsDialog::setMinimumFee() {
     ui->radioCustomPerKilobyte->setChecked(true);
     ui->customFee->setValue(CWallet::GetRequiredFee(1000));
 }
 
 void SendCoinsDialog::updateFeeSectionControls() {
     ui->sliderSmartFee->setEnabled(ui->radioSmartFee->isChecked());
     ui->labelSmartFee->setEnabled(ui->radioSmartFee->isChecked());
     ui->labelSmartFee2->setEnabled(ui->radioSmartFee->isChecked());
     ui->labelSmartFee3->setEnabled(ui->radioSmartFee->isChecked());
     ui->labelFeeEstimation->setEnabled(ui->radioSmartFee->isChecked());
     ui->labelSmartFeeNormal->setEnabled(ui->radioSmartFee->isChecked());
     ui->labelSmartFeeFast->setEnabled(ui->radioSmartFee->isChecked());
     ui->confirmationTargetLabel->setEnabled(ui->radioSmartFee->isChecked());
     ui->checkBoxMinimumFee->setEnabled(ui->radioCustomFee->isChecked());
     ui->labelMinFeeWarning->setEnabled(ui->radioCustomFee->isChecked());
     ui->radioCustomPerKilobyte->setEnabled(
         ui->radioCustomFee->isChecked() &&
         !ui->checkBoxMinimumFee->isChecked());
     ui->radioCustomAtLeast->setEnabled(
         ui->radioCustomFee->isChecked() &&
         !ui->checkBoxMinimumFee->isChecked() &&
         CoinControlDialog::coinControl->HasSelected());
     ui->customFee->setEnabled(ui->radioCustomFee->isChecked() &&
                               !ui->checkBoxMinimumFee->isChecked());
 }
 
 void SendCoinsDialog::updateGlobalFeeVariables() {
     if (ui->radioSmartFee->isChecked()) {
         int nConfirmTarget =
             ui->sliderSmartFee->maximum() - ui->sliderSmartFee->value() + 2;
         payTxFee = CFeeRate(Amount::zero());
 
         // set nMinimumTotalFee to 0 to not accidentally pay a custom fee
         CoinControlDialog::coinControl->nMinimumTotalFee = Amount::zero();
 
         // show the estimated required time for confirmation
         ui->confirmationTargetLabel->setText(
             GUIUtil::formatDurationStr(
                 nConfirmTarget *
                 model->getChainParams().GetConsensus().nPowTargetSpacing) +
             " / " + tr("%n block(s)", "", nConfirmTarget));
     } else {
         payTxFee = CFeeRate(Amount(ui->customFee->value()));
 
         // if user has selected to set a minimum absolute fee, pass the value to
         // coincontrol
         // set nMinimumTotalFee to 0 in case of user has selected that the fee
         // is per KB
         CoinControlDialog::coinControl->nMinimumTotalFee =
             ui->radioCustomAtLeast->isChecked() ? ui->customFee->value()
                                                 : Amount::zero();
     }
 }
 
 void SendCoinsDialog::updateFeeMinimizedLabel() {
     if (!model || !model->getOptionsModel()) return;
 
     if (ui->radioSmartFee->isChecked())
         ui->labelFeeMinimized->setText(ui->labelSmartFee->text());
     else {
         ui->labelFeeMinimized->setText(
             BitcoinUnits::formatWithUnit(
                 model->getOptionsModel()->getDisplayUnit(),
                 ui->customFee->value()) +
             ((ui->radioCustomPerKilobyte->isChecked()) ? "/kB" : ""));
     }
 }
 
 void SendCoinsDialog::updateMinFeeLabel() {
     if (model && model->getOptionsModel())
         ui->checkBoxMinimumFee->setText(
             tr("Pay only the required fee of %1")
                 .arg(BitcoinUnits::formatWithUnit(
                          model->getOptionsModel()->getDisplayUnit(),
                          CWallet::GetRequiredFee(1000)) +
                      "/kB"));
 }
 
 void SendCoinsDialog::updateSmartFeeLabel() {
     if (!model || !model->getOptionsModel()) return;
 
     int nBlocksToConfirm =
         ui->sliderSmartFee->maximum() - ui->sliderSmartFee->value() + 2;
     int estimateFoundAtBlocks = nBlocksToConfirm;
     CFeeRate feeRate =
         mempool.estimateSmartFee(nBlocksToConfirm, &estimateFoundAtBlocks);
     // not enough data => minfee
     if (feeRate <= CFeeRate(Amount::zero())) {
         ui->labelSmartFee->setText(
             BitcoinUnits::formatWithUnit(
                 model->getOptionsModel()->getDisplayUnit(),
                 std::max(CWallet::fallbackFee.GetFeePerK(),
                          CWallet::GetRequiredFee(1000))) +
             "/kB");
         // (Smart fee not initialized yet. This usually takes a few blocks...)
         ui->labelSmartFee2->show();
         ui->labelFeeEstimation->setText("");
     } else {
         ui->labelSmartFee->setText(
             BitcoinUnits::formatWithUnit(
                 model->getOptionsModel()->getDisplayUnit(),
                 std::max(feeRate.GetFeePerK(), CWallet::GetRequiredFee(1000))) +
             "/kB");
         ui->labelSmartFee2->hide();
         ui->labelFeeEstimation->setText(
             tr("Estimated to begin confirmation within %n block(s).", "",
                estimateFoundAtBlocks));
     }
 
     updateFeeMinimizedLabel();
 }
 
 // Coin Control: copy label "Quantity" to clipboard
 void SendCoinsDialog::coinControlClipboardQuantity() {
     GUIUtil::setClipboard(ui->labelCoinControlQuantity->text());
 }
 
 // Coin Control: copy label "Amount" to clipboard
 void SendCoinsDialog::coinControlClipboardAmount() {
     GUIUtil::setClipboard(ui->labelCoinControlAmount->text().left(
         ui->labelCoinControlAmount->text().indexOf(" ")));
 }
 
 // Coin Control: copy label "Fee" to clipboard
 void SendCoinsDialog::coinControlClipboardFee() {
     GUIUtil::setClipboard(
         ui->labelCoinControlFee->text()
             .left(ui->labelCoinControlFee->text().indexOf(" "))
             .replace(ASYMP_UTF8, ""));
 }
 
 // Coin Control: copy label "After fee" to clipboard
 void SendCoinsDialog::coinControlClipboardAfterFee() {
     GUIUtil::setClipboard(
         ui->labelCoinControlAfterFee->text()
             .left(ui->labelCoinControlAfterFee->text().indexOf(" "))
             .replace(ASYMP_UTF8, ""));
 }
 
 // Coin Control: copy label "Bytes" to clipboard
 void SendCoinsDialog::coinControlClipboardBytes() {
     GUIUtil::setClipboard(
         ui->labelCoinControlBytes->text().replace(ASYMP_UTF8, ""));
 }
 
 // Coin Control: copy label "Dust" to clipboard
 void SendCoinsDialog::coinControlClipboardLowOutput() {
     GUIUtil::setClipboard(ui->labelCoinControlLowOutput->text());
 }
 
 // Coin Control: copy label "Change" to clipboard
 void SendCoinsDialog::coinControlClipboardChange() {
     GUIUtil::setClipboard(
         ui->labelCoinControlChange->text()
             .left(ui->labelCoinControlChange->text().indexOf(" "))
             .replace(ASYMP_UTF8, ""));
 }
 
 // Coin Control: settings menu - coin control enabled/disabled by user
 void SendCoinsDialog::coinControlFeatureChanged(bool checked) {
     ui->frameCoinControl->setVisible(checked);
 
     // coin control features disabled
     if (!checked && model) CoinControlDialog::coinControl->SetNull();
 
     // make sure we set back the confirmation target
     updateGlobalFeeVariables();
     coinControlUpdateLabels();
 }
 
 // Coin Control: button inputs -> show actual coin control dialog
 void SendCoinsDialog::coinControlButtonClicked() {
     CoinControlDialog dlg(platformStyle);
     dlg.setModel(model);
     dlg.exec();
     coinControlUpdateLabels();
 }
 
 // Coin Control: checkbox custom change address
 void SendCoinsDialog::coinControlChangeChecked(int state) {
     if (state == Qt::Unchecked) {
         CoinControlDialog::coinControl->destChange = CNoDestination();
         ui->labelCoinControlChangeLabel->clear();
     } else {
         // use this to re-validate an already entered address
         coinControlChangeEdited(ui->lineEditCoinControlChange->text());
     }
 
     ui->lineEditCoinControlChange->setEnabled((state == Qt::Checked));
 }
 
 // Coin Control: custom change address changed
 void SendCoinsDialog::coinControlChangeEdited(const QString &text) {
     if (model && model->getAddressTableModel()) {
         // Default to no change address until verified
         CoinControlDialog::coinControl->destChange = CNoDestination();
         ui->labelCoinControlChangeLabel->setStyleSheet("QLabel{color:red;}");
 
         const CTxDestination dest =
             DecodeDestination(text.toStdString(), model->getChainParams());
 
         if (text.isEmpty()) {
             // Nothing entered
             ui->labelCoinControlChangeLabel->setText("");
         } else if (!IsValidDestination(dest)) {
             // Invalid address
             ui->labelCoinControlChangeLabel->setText(
                 tr("Warning: Invalid Bitcoin address"));
         } else {
             // Valid address
             if (!model->IsSpendable(dest)) {
                 ui->labelCoinControlChangeLabel->setText(
                     tr("Warning: Unknown change address"));
 
                 // confirmation dialog
                 QMessageBox::StandardButton btnRetVal = QMessageBox::question(
                     this, tr("Confirm custom change address"),
                     tr("The address you selected for change is not part of "
                        "this wallet. Any or all funds in your wallet may be "
                        "sent to this address. Are you sure?"),
                     QMessageBox::Yes | QMessageBox::Cancel,
                     QMessageBox::Cancel);
 
                 if (btnRetVal == QMessageBox::Yes)
                     CoinControlDialog::coinControl->destChange = dest;
                 else {
                     ui->lineEditCoinControlChange->setText("");
                     ui->labelCoinControlChangeLabel->setStyleSheet(
                         "QLabel{color:black;}");
                     ui->labelCoinControlChangeLabel->setText("");
                 }
             } else {
                 // Known change address
                 ui->labelCoinControlChangeLabel->setStyleSheet(
                     "QLabel{color:black;}");
 
                 // Query label
                 QString associatedLabel =
                     model->getAddressTableModel()->labelForAddress(text);
                 if (!associatedLabel.isEmpty())
                     ui->labelCoinControlChangeLabel->setText(associatedLabel);
                 else
                     ui->labelCoinControlChangeLabel->setText(tr("(no label)"));
 
                 CoinControlDialog::coinControl->destChange = dest;
             }
         }
     }
 }
 
 // Coin Control: update labels
 void SendCoinsDialog::coinControlUpdateLabels() {
     if (!model || !model->getOptionsModel()) return;
 
     if (model->getOptionsModel()->getCoinControlFeatures()) {
         // enable minimum absolute fee UI controls
         ui->radioCustomAtLeast->setVisible(true);
 
         // only enable the feature if inputs are selected
         ui->radioCustomAtLeast->setEnabled(
             ui->radioCustomFee->isChecked() &&
             !ui->checkBoxMinimumFee->isChecked() &&
             CoinControlDialog::coinControl->HasSelected());
     } else {
         // in case coin control is disabled (=default), hide minimum absolute
         // fee UI controls
         ui->radioCustomAtLeast->setVisible(false);
         return;
     }
 
     // set pay amounts
     CoinControlDialog::payAmounts.clear();
     CoinControlDialog::fSubtractFeeFromAmount = false;
     for (int i = 0; i < ui->entries->count(); ++i) {
         SendCoinsEntry *entry =
             qobject_cast<SendCoinsEntry *>(ui->entries->itemAt(i)->widget());
         if (entry && !entry->isHidden()) {
             SendCoinsRecipient rcp = entry->getValue();
             CoinControlDialog::payAmounts.append(rcp.amount);
             if (rcp.fSubtractFeeFromAmount)
                 CoinControlDialog::fSubtractFeeFromAmount = true;
         }
     }
 
     if (CoinControlDialog::coinControl->HasSelected()) {
         // actual coin control calculation
         CoinControlDialog::updateLabels(model, this);
 
         // show coin control stats
         ui->labelCoinControlAutomaticallySelected->hide();
         ui->widgetCoinControl->show();
     } else {
         // hide coin control stats
         ui->labelCoinControlAutomaticallySelected->show();
         ui->widgetCoinControl->hide();
         ui->labelCoinControlInsuffFunds->hide();
     }
 }
 
 SendConfirmationDialog::SendConfirmationDialog(const QString &title,
                                                const QString &text,
                                                int _secDelay, QWidget *parent)
     : QMessageBox(QMessageBox::Question, title, text,
                   QMessageBox::Yes | QMessageBox::Cancel, parent),
       secDelay(_secDelay) {
     setDefaultButton(QMessageBox::Cancel);
     yesButton = button(QMessageBox::Yes);
     updateYesButton();
     connect(&countDownTimer, SIGNAL(timeout()), this, SLOT(countDown()));
 }
 
 int SendConfirmationDialog::exec() {
     updateYesButton();
     countDownTimer.start(1000);
     return QMessageBox::exec();
 }
 
 void SendConfirmationDialog::countDown() {
     secDelay--;
     updateYesButton();
 
     if (secDelay <= 0) {
         countDownTimer.stop();
     }
 }
 
 void SendConfirmationDialog::updateYesButton() {
     if (secDelay > 0) {
         yesButton->setEnabled(false);
         yesButton->setText(tr("Yes") + " (" + QString::number(secDelay) + ")");
     } else {
         yesButton->setEnabled(true);
         yesButton->setText(tr("Yes"));
     }
 }
diff --git a/src/qt/sendcoinsdialog.h b/src/qt/sendcoinsdialog.h
index edbfbeda2..866d8eb0b 100644
--- a/src/qt/sendcoinsdialog.h
+++ b/src/qt/sendcoinsdialog.h
@@ -1,128 +1,129 @@
 // Copyright (c) 2011-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_QT_SENDCOINSDIALOG_H
 #define BITCOIN_QT_SENDCOINSDIALOG_H
 
 #include "walletmodel.h"
 
 #include <QDialog>
 #include <QMessageBox>
 #include <QString>
 #include <QTimer>
 
 class ClientModel;
 class OptionsModel;
 class PlatformStyle;
 class SendCoinsEntry;
 class SendCoinsRecipient;
 
 namespace Ui {
 class SendCoinsDialog;
 }
 
 QT_BEGIN_NAMESPACE
 class QUrl;
 QT_END_NAMESPACE
 
 /** Dialog for sending bitcoins */
 class SendCoinsDialog : public QDialog {
     Q_OBJECT
 
 public:
     explicit SendCoinsDialog(const PlatformStyle *platformStyle,
                              QWidget *parent = 0);
     ~SendCoinsDialog();
 
     void setClientModel(ClientModel *clientModel);
     void setModel(WalletModel *model);
 
     /**
      * Set up the tab chain manually, as Qt messes up the tab chain by default
      * in some cases (issue
      * https://bugreports.qt-project.org/browse/QTBUG-10907).
      */
     QWidget *setupTabChain(QWidget *prev);
 
     void setAddress(const QString &address);
     void pasteEntry(const SendCoinsRecipient &rv);
     bool handlePaymentRequest(const SendCoinsRecipient &recipient);
 
 public Q_SLOTS:
     void clear();
     void reject() override;
     void accept() override;
     SendCoinsEntry *addEntry();
     void updateTabsAndLabels();
     void setBalance(const Amount balance, const Amount unconfirmedBalance,
                     const Amount immatureBalance, const Amount watchOnlyBalance,
                     const Amount watchUnconfBalance,
                     const Amount watchImmatureBalance);
 
 private:
     Ui::SendCoinsDialog *ui;
     ClientModel *clientModel;
     WalletModel *model;
     bool fNewRecipientAllowed;
     bool fFeeMinimized;
     const PlatformStyle *platformStyle;
 
     // Process WalletModel::SendCoinsReturn and generate a pair consisting of a
     // message and message flags for use in Q_EMIT message().
     // Additional parameter msgArg can be used via .arg(msgArg).
     void
     processSendCoinsReturn(const WalletModel::SendCoinsReturn &sendCoinsReturn,
                            const QString &msgArg = QString());
     void minimizeFeeSection(bool fMinimize);
     void updateFeeMinimizedLabel();
 
 private Q_SLOTS:
     void on_sendButton_clicked();
     void on_buttonChooseFee_clicked();
     void on_buttonMinimizeFee_clicked();
     void removeEntry(SendCoinsEntry *entry);
+    void useAvailableBalance(SendCoinsEntry *entry);
     void updateDisplayUnit();
     void coinControlFeatureChanged(bool);
     void coinControlButtonClicked();
     void coinControlChangeChecked(int);
     void coinControlChangeEdited(const QString &);
     void coinControlUpdateLabels();
     void coinControlClipboardQuantity();
     void coinControlClipboardAmount();
     void coinControlClipboardFee();
     void coinControlClipboardAfterFee();
     void coinControlClipboardBytes();
     void coinControlClipboardLowOutput();
     void coinControlClipboardChange();
     void setMinimumFee();
     void updateFeeSectionControls();
     void updateMinFeeLabel();
     void updateSmartFeeLabel();
     void updateGlobalFeeVariables();
 
 Q_SIGNALS:
     // Fired when a message should be reported to the user
     void message(const QString &title, const QString &message,
                  unsigned int style);
 };
 
 class SendConfirmationDialog : public QMessageBox {
     Q_OBJECT
 
 public:
     SendConfirmationDialog(const QString &title, const QString &text,
                            int secDelay = 0, QWidget *parent = 0);
     int exec();
 
 private Q_SLOTS:
     void countDown();
     void updateYesButton();
 
 private:
     QAbstractButton *yesButton;
     QTimer countDownTimer;
     int secDelay;
 };
 
 #endif // BITCOIN_QT_SENDCOINSDIALOG_H
diff --git a/src/qt/sendcoinsentry.cpp b/src/qt/sendcoinsentry.cpp
index 9bf0b124e..b67f691ec 100644
--- a/src/qt/sendcoinsentry.cpp
+++ b/src/qt/sendcoinsentry.cpp
@@ -1,262 +1,280 @@
 // Copyright (c) 2011-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "sendcoinsentry.h"
 #include "ui_sendcoinsentry.h"
 
 #include "addressbookpage.h"
 #include "addresstablemodel.h"
 #include "config.h"
 #include "guiutil.h"
 #include "optionsmodel.h"
 #include "platformstyle.h"
 #include "walletmodel.h"
 
 #include <QApplication>
 #include <QClipboard>
 
 SendCoinsEntry::SendCoinsEntry(const PlatformStyle *_platformStyle,
                                QWidget *parent)
     : QStackedWidget(parent), ui(new Ui::SendCoinsEntry), model(0),
       platformStyle(_platformStyle) {
     ui->setupUi(this);
 
     ui->addressBookButton->setIcon(
         platformStyle->SingleColorIcon(":/icons/address-book"));
     ui->pasteButton->setIcon(
         platformStyle->SingleColorIcon(":/icons/editpaste"));
     ui->deleteButton->setIcon(platformStyle->SingleColorIcon(":/icons/remove"));
     ui->deleteButton_is->setIcon(
         platformStyle->SingleColorIcon(":/icons/remove"));
     ui->deleteButton_s->setIcon(
         platformStyle->SingleColorIcon(":/icons/remove"));
 
     ui->messageTextLabel->setToolTip(
         tr("A message that was attached to the %1 URI which will be"
            " stored with the transaction for your reference. Note: "
            "This message will not be sent over the Bitcoin network.")
             .arg(GUIUtil::bitcoinURIScheme(GetConfig())));
 
     setCurrentWidget(ui->SendCoins);
 
     if (platformStyle->getUseExtraSpacing()) ui->payToLayout->setSpacing(4);
 #if QT_VERSION >= 0x040700
     ui->addAsLabel->setPlaceholderText(
         tr("Enter a label for this address to add it to your address book"));
 #endif
 
     // normal bitcoin address field
     GUIUtil::setupAddressWidget(ui->payTo, this);
     // just a label for displaying bitcoin address(es)
     ui->payTo_is->setFont(GUIUtil::fixedPitchFont());
 
     // Connect signals
     connect(ui->payAmount, SIGNAL(valueChanged()), this,
             SIGNAL(payAmountChanged()));
     connect(ui->checkboxSubtractFeeFromAmount, SIGNAL(toggled(bool)), this,
             SIGNAL(subtractFeeFromAmountChanged()));
     connect(ui->deleteButton, SIGNAL(clicked()), this, SLOT(deleteClicked()));
     connect(ui->deleteButton_is, SIGNAL(clicked()), this,
             SLOT(deleteClicked()));
     connect(ui->deleteButton_s, SIGNAL(clicked()), this, SLOT(deleteClicked()));
+    connect(ui->useAvailableBalanceButton, SIGNAL(clicked()), this,
+            SLOT(useAvailableBalanceClicked()));
 }
 
 SendCoinsEntry::~SendCoinsEntry() {
     delete ui;
 }
 
 void SendCoinsEntry::on_pasteButton_clicked() {
     // Paste text from clipboard into recipient field
     ui->payTo->setText(QApplication::clipboard()->text());
 }
 
 void SendCoinsEntry::on_addressBookButton_clicked() {
     if (!model) return;
     AddressBookPage dlg(platformStyle, AddressBookPage::ForSelection,
                         AddressBookPage::SendingTab, this);
     dlg.setModel(model->getAddressTableModel());
     if (dlg.exec()) {
         ui->payTo->setText(dlg.getReturnValue());
         ui->payAmount->setFocus();
     }
 }
 
 void SendCoinsEntry::on_payTo_textChanged(const QString &address) {
     updateLabel(address);
 }
 
 void SendCoinsEntry::setModel(WalletModel *_model) {
     this->model = _model;
 
     if (_model && _model->getOptionsModel())
         connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)),
                 this, SLOT(updateDisplayUnit()));
 
     clear();
 }
 
 void SendCoinsEntry::clear() {
     // clear UI elements for normal payment
     ui->payTo->clear();
     ui->addAsLabel->clear();
     ui->payAmount->clear();
     ui->checkboxSubtractFeeFromAmount->setCheckState(Qt::Unchecked);
     ui->messageTextLabel->clear();
     ui->messageTextLabel->hide();
     ui->messageLabel->hide();
     // clear UI elements for unauthenticated payment request
     ui->payTo_is->clear();
     ui->memoTextLabel_is->clear();
     ui->payAmount_is->clear();
     // clear UI elements for authenticated payment request
     ui->payTo_s->clear();
     ui->memoTextLabel_s->clear();
     ui->payAmount_s->clear();
 
     // update the display unit, to not use the default ("BCH")
     updateDisplayUnit();
 }
 
+void SendCoinsEntry::checkSubtractFeeFromAmount() {
+    ui->checkboxSubtractFeeFromAmount->setChecked(true);
+}
+
 void SendCoinsEntry::deleteClicked() {
     Q_EMIT removeEntry(this);
 }
 
+void SendCoinsEntry::useAvailableBalanceClicked() {
+    Q_EMIT useAvailableBalance(this);
+}
+
 bool SendCoinsEntry::validate() {
-    if (!model) return false;
+    if (!model) {
+        return false;
+    }
 
     // Check input validity
     bool retval = true;
 
     // Skip checks for payment request
-    if (recipient.paymentRequest.IsInitialized()) return retval;
+    if (recipient.paymentRequest.IsInitialized()) {
+        return retval;
+    }
 
     if (!model->validateAddress(ui->payTo->text())) {
         ui->payTo->setValid(false);
         retval = false;
     }
 
     if (!ui->payAmount->validate()) {
         retval = false;
     }
 
     // Sending a zero amount is invalid
     if (ui->payAmount->value(0) <= Amount::zero()) {
         ui->payAmount->setValid(false);
         retval = false;
     }
 
     // Reject dust outputs:
     if (retval && GUIUtil::isDust(ui->payTo->text(), ui->payAmount->value(),
                                   model->getChainParams())) {
         ui->payAmount->setValid(false);
         retval = false;
     }
 
     return retval;
 }
 
 SendCoinsRecipient SendCoinsEntry::getValue() {
     // Payment request
     if (recipient.paymentRequest.IsInitialized()) return recipient;
 
     // Normal payment
     recipient.address = ui->payTo->text();
     recipient.label = ui->addAsLabel->text();
     recipient.amount = ui->payAmount->value();
     recipient.message = ui->messageTextLabel->text();
     recipient.fSubtractFeeFromAmount =
         (ui->checkboxSubtractFeeFromAmount->checkState() == Qt::Checked);
 
     return recipient;
 }
 
 QWidget *SendCoinsEntry::setupTabChain(QWidget *prev) {
     QWidget::setTabOrder(prev, ui->payTo);
     QWidget::setTabOrder(ui->payTo, ui->addAsLabel);
     QWidget *w = ui->payAmount->setupTabChain(ui->addAsLabel);
     QWidget::setTabOrder(w, ui->checkboxSubtractFeeFromAmount);
     QWidget::setTabOrder(ui->checkboxSubtractFeeFromAmount,
                          ui->addressBookButton);
     QWidget::setTabOrder(ui->addressBookButton, ui->pasteButton);
     QWidget::setTabOrder(ui->pasteButton, ui->deleteButton);
     return ui->deleteButton;
 }
 
 void SendCoinsEntry::setValue(const SendCoinsRecipient &value) {
     recipient = value;
 
     if (recipient.paymentRequest.IsInitialized()) // payment request
     {
         if (recipient.authenticatedMerchant.isEmpty()) // unauthenticated
         {
             ui->payTo_is->setText(recipient.address);
             ui->memoTextLabel_is->setText(recipient.message);
             ui->payAmount_is->setValue(recipient.amount);
             ui->payAmount_is->setReadOnly(true);
             setCurrentWidget(ui->SendCoins_UnauthenticatedPaymentRequest);
         } else // authenticated
         {
             ui->payTo_s->setText(recipient.authenticatedMerchant);
             ui->memoTextLabel_s->setText(recipient.message);
             ui->payAmount_s->setValue(recipient.amount);
             ui->payAmount_s->setReadOnly(true);
             setCurrentWidget(ui->SendCoins_AuthenticatedPaymentRequest);
         }
     } else // normal payment
     {
         // message
         ui->messageTextLabel->setText(recipient.message);
         ui->messageTextLabel->setVisible(!recipient.message.isEmpty());
         ui->messageLabel->setVisible(!recipient.message.isEmpty());
 
         ui->addAsLabel->clear();
         ui->payTo->setText(
             recipient.address);         // this may set a label from addressbook
         if (!recipient.label.isEmpty()) // if a label had been set from the
                                         // addressbook, don't overwrite with an
                                         // empty label
             ui->addAsLabel->setText(recipient.label);
         ui->payAmount->setValue(recipient.amount);
     }
 }
 
 void SendCoinsEntry::setAddress(const QString &address) {
     ui->payTo->setText(address);
     ui->payAmount->setFocus();
 }
 
+void SendCoinsEntry::setAmount(const Amount amount) {
+    ui->payAmount->setValue(amount);
+}
+
 bool SendCoinsEntry::isClear() {
     return ui->payTo->text().isEmpty() && ui->payTo_is->text().isEmpty() &&
            ui->payTo_s->text().isEmpty();
 }
 
 void SendCoinsEntry::setFocus() {
     ui->payTo->setFocus();
 }
 
 void SendCoinsEntry::updateDisplayUnit() {
     if (model && model->getOptionsModel()) {
         // Update payAmount with the current unit
         ui->payAmount->setDisplayUnit(
             model->getOptionsModel()->getDisplayUnit());
         ui->payAmount_is->setDisplayUnit(
             model->getOptionsModel()->getDisplayUnit());
         ui->payAmount_s->setDisplayUnit(
             model->getOptionsModel()->getDisplayUnit());
     }
 }
 
 bool SendCoinsEntry::updateLabel(const QString &address) {
     if (!model) return false;
 
     // Fill in label from address book, if address has an associated label
     QString associatedLabel =
         model->getAddressTableModel()->labelForAddress(address);
     if (!associatedLabel.isEmpty()) {
         ui->addAsLabel->setText(associatedLabel);
         return true;
     }
 
     return false;
 }
diff --git a/src/qt/sendcoinsentry.h b/src/qt/sendcoinsentry.h
index f7a2cf602..d9c8017fc 100644
--- a/src/qt/sendcoinsentry.h
+++ b/src/qt/sendcoinsentry.h
@@ -1,74 +1,78 @@
 // Copyright (c) 2011-2015 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_QT_SENDCOINSENTRY_H
 #define BITCOIN_QT_SENDCOINSENTRY_H
 
 #include "walletmodel.h"
 
 #include <QStackedWidget>
 
 class WalletModel;
 class PlatformStyle;
 
 namespace Ui {
 class SendCoinsEntry;
 }
 
 /**
  * A single entry in the dialog for sending bitcoins.
  * Stacked widget, with different UIs for payment requests
  * with a strong payee identity.
  */
 class SendCoinsEntry : public QStackedWidget {
     Q_OBJECT
 
 public:
     explicit SendCoinsEntry(const PlatformStyle *platformStyle,
                             QWidget *parent = 0);
     ~SendCoinsEntry();
 
     void setModel(WalletModel *model);
     bool validate();
     SendCoinsRecipient getValue();
 
     /** Return whether the entry is still empty and unedited */
     bool isClear();
 
     void setValue(const SendCoinsRecipient &value);
     void setAddress(const QString &address);
+    void setAmount(const Amount amount);
 
     /** Set up the tab chain manually, as Qt messes up the tab chain by default
      * in some cases
      *  (issue https://bugreports.qt-project.org/browse/QTBUG-10907).
      */
     QWidget *setupTabChain(QWidget *prev);
 
     void setFocus();
 
 public Q_SLOTS:
     void clear();
+    void checkSubtractFeeFromAmount();
 
 Q_SIGNALS:
     void removeEntry(SendCoinsEntry *entry);
+    void useAvailableBalance(SendCoinsEntry *entry);
     void payAmountChanged();
     void subtractFeeFromAmountChanged();
 
 private Q_SLOTS:
     void deleteClicked();
+    void useAvailableBalanceClicked();
     void on_payTo_textChanged(const QString &address);
     void on_addressBookButton_clicked();
     void on_pasteButton_clicked();
     void updateDisplayUnit();
 
 private:
     SendCoinsRecipient recipient;
     Ui::SendCoinsEntry *ui;
     WalletModel *model;
     const PlatformStyle *platformStyle;
 
     bool updateLabel(const QString &address);
 };
 
 #endif // BITCOIN_QT_SENDCOINSENTRY_H