Free Calculator

Extra Mortgage Payment Calculator

See how extra monthly payments or a lump-sum payment can reduce mortgage interest and shorten your loan payoff time.

Updated May 2026

Loan Details

$
%

Extra Payments

$
$

Applied to principal at loan start

Payment Comparison

StandardWith Extra PaymentsSavings
Monthly Payment$1,896$2,096+$200/mo
Total Interest$382,633$279,185$103,449
Total Cost$682,633$579,185$103,449
Payoff DateJanuary 2055February 20486y 11m earlier

Amortization Summary

YearStandard BalanceExtra Pmt BalanceBalance Saved
Year 1$296,647$294,174$2,473
Year 2$293,069$287,958$5,111
Year 3$289,252$281,325$7,926
Year 4$285,179$274,249$10,930
Year 5$280,833$266,698$14,135
Year 6$276,196$258,642$17,554
Year 7$271,249$250,046$21,203
Year 8$265,970$240,875$25,095
Year 9$260,338$231,089$29,249
Year 10$254,328$220,648$33,681

Interest Saved

$103,449

by making extra payments

Pay off 6 years, 11 months earlier

Payoff Dates

Regular payoff date

January 2055

Standard

New payoff date

February 2048

With Extra

Time Saved

6

Years Saved

83

Months Saved

Total Interest Comparison

Standard loan total interest

$382,633

New total interest

$279,185

You save$103,449

See How Extra Payments Change Your Mortgage

Compare refinancing options to potentially lower your rate and save even more.

Compare Refinance Options

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How Extra Mortgage Payments Work

Extra Payments Go to Principal

When you make an extra payment, it is applied directly to your loan principal — not interest. This reduces your balance faster, which means less interest accrues each month.

Compounding Savings Effect

Each extra payment reduces your balance, which reduces next month's interest charge. This creates a compounding effect — the savings grow over time, not just in the final years.

Lump Sum vs. Monthly Extra

A one-time lump sum payment (like a tax refund) makes an immediate large impact. Monthly extra payments build savings consistently. Both strategies are effective — combining them is even better.

Check for Prepayment Penalties

Most modern mortgages allow extra payments without penalty. However, some loans — especially older ones — may have prepayment penalties. Check your loan documents before making large extra payments.

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Frequently Asked Questions

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