Updated on 2026-08-14

features/send/impl/src/main/java/com/tangem/features/send/send/confirm/model/SendConfirmModel.kt

@@ -515,6 +515,13 @@ internal class SendConfirmModel @Inject constructor(
                     feeCryptoCurrencyStatus = getCurrencyStatusForFeePayment(),
                 ),
             )
+            val balance = cryptoCurrencyStatus.value.amount.orZero()
+            val feeValue = confirmData.fee?.amount?.value.orZero()
+            val isTotalSendingMoreThanBalance = confirmData.enteredAmount.orZero() + feeValue > balance
+            val isFeeSubtractedFromAmount = isAmountSubtractAvailable && isTotalSendingMoreThanBalance
+            // Fee alone can't be covered by the balance → nothing can be sent, footer must show $0.
+            val isFeeExceedingBalance = isAmountSubtractAvailable && feeValue > balance
+
             _uiState.update { state ->
                 state.copy(
                     confirmUM = SendConfirmationNotificationsTransformerV2(
@@ -524,6 +531,8 @@ internal class SendConfirmModel @Inject constructor(
                         cryptoCurrency = cryptoCurrencyStatus.currency,
                         appCurrency = appCurrency,
                         analyticsCategoryName = params.analyticsCategoryName,
+                        isFeeSubtractedFromAmount = isFeeSubtractedFromAmount,
+                        isFeeExceedingBalance = isFeeExceedingBalance,
                     ).transform(uiState.value.confirmUM),
                 )
             }

features/send/impl/src/main/java/com/tangem/features/send/send/confirm/model/transformers/SendConfirmationNotificationsTransformerV2.kt

@@ -21,7 +21,9 @@ import com.tangem.features.send.common.ui.state.ConfirmUM
 import com.tangem.features.send.impl.R
 import com.tangem.utils.transformer.Transformer
 import kotlinx.collections.immutable.toPersistentList
+import java.math.BigDecimal
 
+@Suppress("LongParameterList")
 internal class SendConfirmationNotificationsTransformerV2(
     private val feeSelectorUM: FeeSelectorUM,
     private val amountUM: AmountState,
@@ -29,6 +31,8 @@ internal class SendConfirmationNotificationsTransformerV2(
     private val cryptoCurrency: CryptoCurrency,
     private val appCurrency: AppCurrency,
     private val analyticsCategoryName: String,
+    private val isFeeSubtractedFromAmount: Boolean,
+    private val isFeeExceedingBalance: Boolean,
 ) : Transformer<ConfirmUM> {
     override fun transform(prevState: ConfirmUM): ConfirmUM {
         val state = prevState as? ConfirmUM.Content ?: return prevState
@@ -73,10 +77,14 @@ internal class SendConfirmationNotificationsTransformerV2(
 
         val isFeeConvertibleToFiat = feeSelectorUM.feeExtraInfo.isFeeConvertibleToFiat
 
-        val fiatSendingValue = if (isFeeConvertibleToFiat) {
-            fiatFeeValue?.let { fiatAmountValue?.plus(it) }
-        } else {
-            fiatAmountValue
+        val fiatSendingValue = when {
+            !isFeeConvertibleToFiat -> fiatAmountValue
+            // Fee alone exceeds the balance → the transaction can't go through, nothing is sent.
+            isFeeExceedingBalance -> BigDecimal.ZERO
+            // When the fee is subtracted from the amount, the entered amount is the gross that already
+            // includes the fee, so it must not be added again — that double-counts it.
+            isFeeSubtractedFromAmount -> fiatAmountValue
+            else -> fiatFeeValue?.let { fiatAmountValue?.plus(it) }
         }
 
         val fiatSending = fiatSendingValue.format {