8 years and 6 months earlier
21 years and 6 months
Instead of 30 years
Mortgage Payoff Calculator
Mortgage Extra Payments Calculator
See how extra principal payments could shorten your mortgage payoff timeline and reduce interest. Compare monthly, annual, one-time, or combined extra-payment strategies against your original loan schedule.
Last reviewed: September 1, 2026
Mortgage Extra Payments Calculator
See how extra principal payments can shorten your mortgage and reduce interest.
Tip: Compare multiple extra-payment amounts. Even a modest recurring payment can make a meaningful difference over time.
You’ll Pay Off Your Loan
Save
$52,756
in estimated interest
Could refinancing make sense?
Compare Your Refinance Options
You have estimated the potential costs and savings. Continue to explore refinance options for your mortgage scenario.
Calculator results are estimates. Actual refinance savings, rates, closing costs, eligibility, and loan terms depend on lender and borrower qualifications.
Loan Summary Comparison
| Comparison | No Extra Payments | With Extra Payments | Difference |
|---|---|---|---|
| Payoff Time | 30 years | 21 years and 6 months | 8 years and 6 months earlier |
| Total Payments | $364,813 | $312,058 | -$52,756 |
| Total Interest | $164,813 | $112,058 | -$52,756 |
Payoff Time
Total Payments
Total Interest
Balance Over Time
Compare the original payoff path with your accelerated payoff plan.
Regular Monthly P&I
$1,013.37
New Payoff Date
March 2048
Time Saved
8 years and 6 months
Interest Saved
$52,756
What Your Results Mean
By adding $200.00 each month, the mortgage is projected to be paid off in 21 years and 6 months, around March 2048. That is 8 years and 6 months earlier and may save approximately $52,755.51 in interest compared with the original payment schedule.
Shorter Loan Term
Extra principal reduces the balance sooner, which can move your payoff date forward.
Lower Interest Cost
Paying principal down earlier leaves less balance on which future interest can accrue.
Faster Equity Growth
A larger share of your payments goes toward principal, helping build home equity sooner.
Annual Amortization Schedule
Review annual principal, interest, extra payments, and remaining balance.
Monthly Amortization Schedule
See how each scheduled and extra payment changes your principal and balance.
Compare Refinance Rates
See Current Refinance Options
Extra principal can shorten your current mortgage. You can also compare refinance offers if you are evaluating whether a different rate or loan structure may better fit your payoff plan.
How extra mortgage payments work
An extra mortgage payment is money paid in addition to your required scheduled payment and applied to principal. Reducing principal earlier lowers the balance used to calculate future interest, which can shorten the payoff period and reduce total interest over the remaining life of the loan.
The effect depends on your current loan balance, interest rate, remaining term, when the extra payment is made, and how consistently additional principal is paid. A recurring monthly amount can create a different result from a one-time lump sum made several years from now, even when the total extra dollars are similar.
What this extra payments calculator compares
The calculator runs two amortization scenarios. The first follows the original scheduled principal-and-interest payment with no extra principal. The second applies the extra-payment strategy you enter and recalculates the remaining balance month by month.
Original mortgage schedule
Accelerated schedule
Uses the scheduled monthly principal-and-interest payment through the original payoff date.
Adds the monthly, annual, one-time, or combined principal payments you specify and estimates the earlier payoff date and interest saved.
Why paying principal earlier can save interest
On a typical fixed-rate mortgage, each scheduled payment includes interest based on the outstanding principal balance and a principal portion that reduces that balance. When additional money is applied directly to principal, the balance falls faster. Future interest is then calculated on a smaller amount.
Basic relationship
Lower principal balance → less future interest → faster payoff
This does not normally reduce the contractual monthly payment unless the loan is formally recast or refinanced. Instead, the same scheduled payment reaches a zero balance sooner because more principal has already been removed.
Monthly, annual, and one-time extra payments
Recurring monthly extra
A fixed amount added every month can steadily reduce the balance throughout the year.
Annual extra payment
A yearly principal payment can fit households that receive a predictable bonus, refund, or other annual cash flow.
One-time lump sum
A single principal payment reduces the balance from the month it is applied, lowering interest that would otherwise accrue afterward.
Combination strategy
The calculator can combine recurring monthly, annual, and one-time payments so you can model a more realistic payoff plan.
Does making one extra mortgage payment per year help?
It can. One common strategy is to contribute the equivalent of one additional scheduled payment toward principal each year. The exact impact depends on the loan balance, rate, remaining term, and when the extra principal is posted. The calculator's annual-payment option lets you test the dollar amount and posting month instead of relying on a generic rule of thumb.
If you are considering a biweekly strategy, remember that 26 half payments are equivalent to 13 full monthly payments over a year. Whether a servicer accepts or holds partial payments can vary, so confirm how your servicer handles biweekly remittances before assuming they will be applied immediately.
Extra payments vs. mortgage recasting
Extra principal and a mortgage recast are related but different. Sending extra principal reduces your balance. A recast, when available, generally recalculates the required monthly principal-and-interest payment using the lower balance and the loan's remaining term while keeping the existing interest rate.
Without a recast, extra principal usually does not change the required scheduled payment. Its primary modeled benefits are a lower balance, less interest, and an earlier payoff.
Extra payments vs. refinancing
Extra payments keep the existing mortgage and reduce its balance. Refinancing replaces the existing loan with a new one and can change the interest rate, loan term, payment, and closing costs. The two strategies therefore solve different problems.
A homeowner with a competitive current rate may prefer to keep the loan and accelerate principal. Someone who can materially improve the rate or needs a different loan structure may want to compare refinancing after accounting for closing costs and the expected time needed to recover them.
Before making large extra mortgage payments
1
Confirm the payment will be applied to principal
Check your servicer's payment instructions and verify that additional funds are credited as principal rather than treated as an early future payment.
2
Review your loan for prepayment restrictions
Mortgage terms vary. Check the note and servicing information before making unusually large or accelerated payments.
3
Keep adequate liquidity
Money sent to mortgage principal becomes home equity and is generally less liquid than cash held in an emergency reserve.
4
Compare other uses for the money
Consider other debts, cash reserves, retirement contributions, investment objectives, and near-term expenses before committing additional cash to the mortgage.
5
Recheck the payoff plan when circumstances change
A change in income, interest rates, housing plans, or other financial priorities may change how much extra principal you want to pay.
How to read your calculator results
Focus first on the new payoff date, the amount of time saved, and the estimated interest saved. Then use the loan-summary comparison and balance chart to see how quickly the accelerated scenario separates from the original schedule.
The amortization tables provide more detail about scheduled principal, extra principal, interest, and ending balance. They are especially useful when testing an annual or one-time payment because you can see when the balance changes and how the interest path responds.
Frequently asked questions
Do extra mortgage payments automatically lower my monthly payment?
Usually no. Extra principal generally reduces the balance and can shorten the payoff period, while the contractual monthly principal-and-interest payment stays the same unless the loan is recast, refinanced, or otherwise modified.
Should I make extra payments monthly or as a lump sum?
Earlier principal reduction generally has more time to reduce future interest, but the best schedule depends on when cash is available and how much liquidity you want to preserve. The calculator lets you compare both approaches.
Can I combine monthly and annual extra payments?
Yes. Use the combination option to model recurring monthly extra principal together with an annual payment and, if desired, a one-time lump sum.
Do extra principal payments change property taxes or homeowners insurance?
No. Extra principal changes the mortgage balance, not the underlying property-tax bill or insurance premium. Escrow collections can still change when taxes, premiums, or servicing requirements change.
Can extra payments eliminate PMI sooner?
Reducing principal can lower the loan-to-value ratio faster, but mortgage-insurance cancellation rules depend on the loan type, applicable requirements, property value, and servicer procedures. Confirm the rules for your specific mortgage.
What if my servicer does not apply the extra money to principal?
Review the servicer's payment instructions and account history. Extra-payment benefits depend on the additional amount actually reducing principal when intended.
Methodology and related tools
Calculator results are estimates for educational and planning purposes. They assume the entered fixed interest rate, scheduled on-time payments, and the extra-principal pattern selected in the calculator. Actual servicing practices, fees, payment timing, loan modifications, and prepayment terms can change real-world results.