diff --git a/web/cashtab/src/hooks/__tests__/migrations.test.js b/web/cashtab/src/hooks/__tests__/migrations.test.js
--- a/web/cashtab/src/hooks/__tests__/migrations.test.js
+++ b/web/cashtab/src/hooks/__tests__/migrations.test.js
@@ -89,4 +89,30 @@
             new BigNumber(testAmountInSatoshis),
         );
     });
+    it(`BigNumber version of remainder variable is equivalent to Math.floor version`, () => {
+        const { toSmallestDenomination } = useBCH();
+
+        // Test case for sending 0.12345678 BCHA
+        let satoshisToSendTest = toSmallestDenomination(
+            new BigNumber('0.12345678'),
+        );
+        // Assume total BCHA available in utxos is 500 sats higher than 0.123456578 BCHA
+        let originalAmountTest = satoshisToSendTest.plus(500);
+        // Assume 229 byte tx fee
+        let txFeeTest = 229;
+
+        expect(
+            Math.floor(
+                originalAmountTest.minus(satoshisToSendTest).minus(txFeeTest),
+            ),
+        ).toStrictEqual(
+            parseInt(
+                originalAmountTest.minus(satoshisToSendTest).minus(txFeeTest),
+            ),
+        );
+    });
+    it(`Using parseInt on a BigNumber returns output type required for Transaction Builder`, () => {
+        const remainder = new BigNumber('12345678');
+        expect(parseInt(remainder)).toStrictEqual(12345678);
+    });
 });
diff --git a/web/cashtab/src/hooks/useBCH.js b/web/cashtab/src/hooks/useBCH.js
--- a/web/cashtab/src/hooks/useBCH.js
+++ b/web/cashtab/src/hooks/useBCH.js
@@ -493,10 +493,9 @@
             }
 
             // amount to send back to the remainder address.
-            const remainder = Math.floor(
-                originalAmount.minus(satoshisToSend).minus(txFee),
-            );
-            if (remainder < 0) {
+            const remainder = originalAmount.minus(satoshisToSend).minus(txFee);
+
+            if (remainder.lt(0)) {
                 const error = new Error(`Insufficient funds`);
                 error.code = SEND_BCH_ERRORS.INSUFFICIENT_FUNDS;
                 throw error;
@@ -507,17 +506,20 @@
             }
 
             // add output w/ address and amount to send
-
             transactionBuilder.addOutput(
                 BCH.Address.toCashAddress(destinationAddress),
                 parseInt(toSmallestDenomination(value)),
             );
 
             if (
-                remainder >=
-                parseFloat(toSmallestDenomination(new BigNumber(currency.dust)))
+                remainder.gte(
+                    toSmallestDenomination(new BigNumber(currency.dust)),
+                )
             ) {
-                transactionBuilder.addOutput(REMAINDER_ADDR, remainder);
+                transactionBuilder.addOutput(
+                    REMAINDER_ADDR,
+                    parseInt(remainder),
+                );
             }
 
             // Sign the transactions with the HD node.