Mortgage Extra Payment Calculator

See how an extra monthly principal payment changes mortgage payoff time and interest cost.

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Withremaining at% foryears, what if I pay an extraper month?

Assumes a fixed-rate mortgage, unchanged required principal-and-interest payment and all extra money applied directly to principal.

New payoff time
Principal + interest only
Regular payment
With extra
Interest saved
Time saved

How extra mortgage payments work

Extra principal reduces the outstanding balance sooner. Because later interest is calculated on a smaller balance, the accelerated schedule can save interest and shorten the mortgage term.

Escrow is excludedProperty tax, insurance, HOA fees and other escrow items do not reduce mortgage principal, so they are not included in this payoff model.

Check how your lender applies extra payments

Confirm that additional money is credited to principal and check for any prepayment restrictions or fees. Real mortgage servicing rules can differ from this standard amortization model.

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Common questions

Does the extra payment change my required payment?

No. This model keeps the scheduled principal-and-interest payment unchanged and adds your extra amount on top.

Does this include taxes and insurance?

No. Those costs are separate from principal-and-interest amortization.

What if my mortgage has a prepayment penalty?

The calculator does not include penalties. Review your loan terms before making an early-payoff decision.