HOME BUYING, EQUITY, AND BORROWING
Estimate mortgage payoff time and interest savings when you add the same extra principal payment each month.
Your result
Enter your values and select Calculate. Your result stays on this device.
The scheduled fixed-rate payment is calculated first. The selected extra amount is then added to every monthly payment and applied to the remaining principal in this estimate.
Uses a fixed rate, no fees, no prepayment penalty, and one constant extra payment. Your servicer may apply payments differently or require payment instructions.
An extra payment can reduce principal sooner, which may reduce later interest. This page makes that trade-off visible without assuming that your servicer will change the payment due date or apply an overpayment automatically.
Use case
Estimate mortgage payoff time and interest savings when you add the same extra principal payment each month. The stated formula, assumptions, and result limits remain visible so the calculation can be checked in context.
Use a clear mortgage payoff calculator scenario with values you can verify before relying on the result.
Build a reliable scenario
Mortgage Payoff Calculator helps you check a specific home & mortgages question with figures that apply to you. Estimate mortgage payoff time and interest savings when you add the same extra principal payment each month. Estimate mortgage payoff time and interest savings when you add the same extra principal payment each month. The stated formula, assumptions, and result limits remain visible so the calculation can be checked in context. Use a clear mortgage payoff calculator scenario with values you can verify before relying on the result. The page keeps the method and limits visible so the result can be understood, compared, and checked instead of treated as an unexplained answer.
Prepare Current mortgage balance, Interest rate, Remaining loan term and Extra monthly principal payment. Enter the balance and remaining term shown by your loan servicer. Use the note rate from your current mortgage statement. Enter only the extra amount you expect to send consistently each month. Compare the estimated payoff time and interest with the scheduled payment. Keep units, dates, currency, and time periods consistent.
The stated method is: The scheduled fixed-rate payment is calculated first. The selected extra amount is then added to every monthly payment and applied to the remaining principal in this estimate. Change one assumption at a time to see which input drives the result, then compare scenarios on the same basis.
Uses a fixed rate, no fees, no prepayment penalty, and one constant extra payment. Your servicer may apply payments differently or require payment instructions. Planning estimate only. Confirm prepayment rules and principal-payment instructions with your loan servicer before changing payments.
Source and update
Last reviewed: 2026-08-08
Consumer Financial Protection Bureau mortgage guidanceNot automatically. Loan servicers can have specific instructions for principal-only payments, and a payment can be treated as an early next payment unless you follow their process.
No. It estimates principal and interest repayment. Escrow, property tax, homeowners insurance, PMI, HOA dues, and fees are not part of the payoff schedule.
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