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Home CalculatorsMortgage Extra Payment Calculator

Mortgage Extra Payment Calculator with clear assumptions.

Compare a standard amortization schedule with an accelerated payment plan.

How the estimate works

Two monthly amortization simulations compare the scheduled payment with the scheduled payment plus extra principal.

Important limitation

Confirm the servicer applies extra payments to principal and check for prepayment restrictions. Results are estimates only and are not financial, lending, legal, tax, or investment advice.

Assumptions and review

Formula review: July 29, 2026. This tool uses only the editable values shown above and does not pull live rates, prices, balances, or account data.

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Frequently asked questions

How does the mortgage extra payment calculator work?

Two monthly amortization simulations compare the scheduled payment with the scheduled payment plus extra principal.

Is this mortgage extra payment calculator exact?

No. It is a planning estimate based on the values you enter. Actual rates, fees, timing, taxes, and provider rules can change the result.

Can I change the assumptions?

Yes. Every displayed input is editable so you can compare scenarios instead of relying on a hidden default.