diff --git a/cashtab/src/transactions/__tests__/index.test.js b/cashtab/src/transactions/__tests__/index.test.js
--- a/cashtab/src/transactions/__tests__/index.test.js
+++ b/cashtab/src/transactions/__tests__/index.test.js
@@ -1,11 +1,16 @@
 // Copyright (c) 2023 The Bitcoin developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
-import { sendXec, getMultisendTargetOutputs } from 'transactions';
+import {
+    sendXec,
+    getMultisendTargetOutputs,
+    ignoreUnspendableUtxos,
+} from 'transactions';
 import { MockChronikClient } from '../../../../apps/mock-chronik-client';
 import {
     sendXecVectors,
     getMultisendTargetOutputsVectors,
+    ignoreUnspendableUtxosVectors,
 } from '../fixtures/vectors';
 
 describe('Improved Cashtab transaction broadcasting function', () => {
@@ -75,3 +80,23 @@
         });
     });
 });
+
+describe('Ignore unspendable coinbase utxos', () => {
+    // Unit test for each vector in fixtures for the ignoreUnspendableUtxos case
+    const { expectedReturns } = ignoreUnspendableUtxosVectors;
+
+    // Successfully built and broadcast txs
+    expectedReturns.forEach(async formedOutput => {
+        const {
+            description,
+            unfilteredUtxos,
+            chaintipBlockheight,
+            spendableUtxos,
+        } = formedOutput;
+        it(`ignoreUnspendableUtxos: ${description}`, () => {
+            expect(
+                ignoreUnspendableUtxos(unfilteredUtxos, chaintipBlockheight),
+            ).toStrictEqual(spendableUtxos);
+        });
+    });
+});
diff --git a/cashtab/src/transactions/fixtures/vectors.js b/cashtab/src/transactions/fixtures/vectors.js
--- a/cashtab/src/transactions/fixtures/vectors.js
+++ b/cashtab/src/transactions/fixtures/vectors.js
@@ -398,3 +398,72 @@
         },
     ],
 };
+
+export const ignoreUnspendableUtxosVectors = {
+    expectedReturns: [
+        {
+            description: 'Array with no coinbase utxos returned unchanged',
+            chaintipBlockheight: 800000,
+            unfilteredUtxos: [
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: false, blockHeight: 800000 },
+            ],
+            spendableUtxos: [
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: false, blockHeight: 800000 },
+            ],
+        },
+        {
+            description:
+                'Array with immature coinbase utxo returned without immature coinbase utxo',
+            chaintipBlockheight: 800000,
+            unfilteredUtxos: [
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: true, blockHeight: 800000 },
+            ],
+            spendableUtxos: [
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: false, blockHeight: 800000 },
+            ],
+        },
+        {
+            description:
+                'Array with some immature coinbase utxos and some mature coinbase utxos returned without immature coinbase utxo',
+            chaintipBlockheight: 800000,
+            unfilteredUtxos: [
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: true, blockHeight: 799900 }, // just mature
+                { isCoinbase: true, blockHeight: 800000 }, // immature
+                { isCoinbase: true, blockHeight: 799901 }, // immature
+                { isCoinbase: true, blockHeight: 799999 }, // immature
+            ],
+            spendableUtxos: [
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: true, blockHeight: 799900 }, // just mature
+            ],
+        },
+        {
+            description:
+                'If blockheight is zero, all coinbase utxos are removed',
+            chaintipBlockheight: 0,
+            unfilteredUtxos: [
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: true, blockHeight: 800000 },
+                { isCoinbase: true, blockHeight: 800000 },
+                { isCoinbase: true, blockHeight: 800000 },
+            ],
+            spendableUtxos: [
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: false, blockHeight: 800000 },
+                { isCoinbase: false, blockHeight: 800000 },
+            ],
+        },
+    ],
+};
diff --git a/cashtab/src/transactions/index.js b/cashtab/src/transactions/index.js
--- a/cashtab/src/transactions/index.js
+++ b/cashtab/src/transactions/index.js
@@ -57,6 +57,9 @@
     // Use only eCash utxos
     const utxos = wallet.state.nonSlpUtxos;
 
+    // Ignore immature coinbase utxos
+    // TODO implement ignoreUnspendableUtxos here
+
     let { inputs, outputs } = coinSelect(utxos, targetOutputs, feeRate);
 
     // Initialize TransactionBuilder
@@ -130,3 +133,25 @@
     }
     return targetOutputs;
 };
+
+/**
+ * Ignore coinbase utxos that do not have enough confirmations to be spendable
+ * TODO cache blockheight so you can ignore only unspendable coinbase utxos
+ * @param {array} unfilteredUtxos an array of chronik utxo objects
+ * @returns {array} an array of utxos without coinbase utxos
+ */
+export const ignoreUnspendableUtxos = (
+    unfilteredUtxos,
+    chaintipBlockheight,
+) => {
+    const COINBASE_REQUIRED_CONFS_TO_SPEND = 100;
+    return unfilteredUtxos.filter(unfilteredUtxo => {
+        return (
+            unfilteredUtxo.isCoinbase === false ||
+            (unfilteredUtxo.isCoinbase === true &&
+                chaintipBlockheight >=
+                    unfilteredUtxo.blockHeight +
+                        COINBASE_REQUIRED_CONFS_TO_SPEND)
+        );
+    });
+};