Money calculators · Updated September 3, 2026
Mortgage Payoff Calculator
Add an extra monthly amount or a one-time lump sum to your mortgage and see the new payoff date and the interest you never pay.
| Principal and interest payment | $2,097.78 |
| Time left on the current schedule | 27 years |
| Time left with extra payments | 21 years 8 months |
| Interest remaining, current schedule | $359,679 |
| Interest remaining, with extra payments | $277,136 |
Balance with extra payments
| Year | Principal paid | Interest paid | Balance |
|---|---|---|---|
| 5 | $9,045 | $18,529 | $280,109 |
| 10 | $12,507 | $15,066 | $224,946 |
| 15 | $17,295 | $10,278 | $148,666 |
| 20 | $23,916 | $3,657 | $43,186 |
| 22 | $17,668 | $428 | $0 |
How the payoff is calculated
scheduled payment = balance × r ÷ (1 − (1 + r)^−months), r = rate ÷ 12
each month: interest = balance × r
principal = payment + extra − interest
balance = balance − principal − (lump sum, month 1 only)Both schedules (with and without extra payments) are simulated month by month; the savings are the difference in total interest and in months to zero. Escrow for taxes and insurance is excluded because it does not affect the loan balance.
Frequently asked questions
How much does an extra $200 a month save on a mortgage?
On a $2,097.78-a-month balance of $320,000 at 6.5% with 27 years left, $200 extra each month pays the loan off 5 years 4 months sooner and saves about $82,544 in interest. Enter your own loan above.
Is it better to pay extra monthly or make one lump sum?
Dollar for dollar, earlier is better: a lump sum today saves more interest than the same amount spread over years, because interest accrues on the outstanding balance every month. The calculator lets you combine both.
Should I pay off my mortgage early or invest?
Paying down a 6.5% mortgage is a guaranteed 6.5% pre-tax return with no risk. If you expect to earn more than that elsewhere after tax, investing may win; many people split the difference. Keep an emergency fund first and check for prepayment penalties.
Do extra payments change my monthly payment?
No. Your scheduled payment stays the same; extra principal shortens the term. To lower the payment instead, look at a mortgage recast.
Do I need to tell my lender to apply extra payments to principal?
Yes. Mark extra amounts "apply to principal" so they are not treated as a prepayment of next month's installment. The CFPB explains the difference.
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Sources and updates
Figures are for tax year 2026 and were checked against the sources below on . Rates change every January; we review every data file at the start of each year and whenever a state announces a mid-year change.
This calculator gives estimates for information only and is not tax, legal or financial advice. Your employer's payroll system, local taxes, benefits and year-to-date wages can change the exact amounts on your pay stub. See how we calculate.