Mortgage Payoff Calculator

Using the mortgage payoff estimate

An extra mortgage payment can reduce the balance before later interest is charged. This tool estimates the payoff-time and interest effect of adding a constant amount to each month's principal-and-interest installment. It starts from the current balance and years remaining, rather than the home's price. The result helps compare recurring overpayments with the scheduled loan, while leaving taxes, insurance and other ownership expenses outside the repayment calculation.

Step-by-step inputs

1. Current loan balance. Use remaining principal from your statement. Do not enter the home's market value or include future interest as though it were already owed. Starting example: $300,000 .
2. Interest rate. Enter the fixed annual rate on the loan being repaid. A changing-rate mortgage needs updated scenarios rather than one lifetime assumption. Starting example: 6.5 %.
3. Years remaining. Use years remaining, not years already paid. The calculator reconstructs the baseline payment from this balance and term. Starting example: 25 .
4. Extra payment per month. Enter additional principal every month, on top of the modeled required installment. It is not the total payment including escrow. Starting example: $200 .

Worked example with the starting values

Using the starting inputs, the estimate is New payoff time: 20.3 years.

The regular payment is calculated from current principal, rate and remaining term. The extra amount is added to that payment to shorten the payoff calculation. Interest saved compares the scheduled loan with the constant-extra scenario; it is not a reduction in property tax or insurance.

Paid off in 20 yr 3 mo — 58 months sooner

Monthly payment (principal & interest)

$2,026

Interest without extra payments

$309,712

Interest with extra payments

$240,826

Interest saved

$68,886

Compare extra payment per month scenarios

All other inputs stay at their starting values. These are modeled comparisons, not quotes, predictions or individual recommendations.

Make a useful comparison

Choose an extra amount you can sustain without missing required payments or using emergency reserves. Paying principal sooner reduces loan interest, but also turns accessible cash into home equity. That money may not be easy to recover when an unexpected bill arrives.

Ask the servicer how to designate an overpayment as principal. An amount applied to a future installment or held temporarily can behave differently from the prompt principal reduction assumed here. Review the following statement to see how it was credited.

Compare several extra-payment levels before choosing a goal. A modest repeatable amount may be more practical than an aggressive schedule that relies on every future month being inexpensive. Recalculate after a large lump sum or a refinance changes the balance.

Common mistakes to avoid

• Do not treat an escrow payment as additional principal. Taxes and insurance remain payable even after the mortgage is cleared.
• The model does not include prepayment penalties, changing rates or missed payments. Check the loan contract and servicing terms before acting.
• The payoff time is a mathematical estimate, not a dated payoff quote. Final interest and small installment adjustments depend on the lender's payment timing.