Mortgage Payoff Calculator: Extra Payment Savings Tool
Mortgage Payoff Calculator: See What Extra Payments Really Save You
Table of Contents
Try the Mortgage Payoff Calculator
| Year | Original Balance | Balance With Extra Payment |
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How Extra Mortgage Payments Work
Every mortgage payment splits between interest and principal. Early in the loan, most of each payment goes to interest. Any extra amount you add, above your required payment, goes straight to principal — which lowers the balance interest is calculated on for every payment after that.
Because interest compounds on a shrinking balance, small extra payments made early in the loan have an outsized effect compared to the same extra amount made later. This is why even a modest extra monthly payment can remove years from a 30-year mortgage.
Things to Check Before You Pay Extra
Confirm with your loan servicer that extra payments are applied directly to principal and not held as a credit toward next month's payment. Also check whether your loan carries a prepayment penalty, and weigh extra payments against other priorities like an emergency fund or higher-interest debt, which often deserve attention first.
Example: $300,000 at 6.5%
A $300,000 mortgage at 6.5% over 30 years normally costs roughly $382,000 in total interest. Adding just $200 extra a month can cut close to 6 years off the loan and save tens of thousands of dollars in interest. Run your own numbers in the calculator above to see your exact figures.
How to Use This Calculator (Checklist)
- Enter your current loan balance, interest rate, and remaining term
- Enter an extra amount you can add to your payment each month
- Compare the original payoff date against the new payoff date with extra payments
- Check the total interest saved to see if the extra payment is worth it for you
- Confirm with your loan servicer that extra payments are applied directly to principal
Glossary
- APR (Annual Percentage Rate)
- The yearly cost of the loan expressed as a percentage, including certain fees.
- PMI (Private Mortgage Insurance)
- Insurance many lenders require when your down payment is below 20% of the home's value.
- LTV (Loan-to-Value Ratio)
- Your loan balance divided by the home's current value, used to assess lending risk.
- ARM (Adjustable-Rate Mortgage)
- A mortgage whose interest rate can change periodically after an initial fixed period.
- HOA (Homeowners Association)
- An organization that manages shared community costs and rules, separate from your mortgage payment.
Frequently Asked Questions
How much does one extra mortgage payment a year save?
On a typical 30-year loan, one extra full payment a year can cut roughly four to six years off the loan and save tens of thousands in interest, depending on the balance and rate.
Is it better to pay extra toward principal or refinance?
Extra principal payments make sense if your current rate is already low and you want to shorten the term without new closing costs. Refinancing makes more sense if today's rates are meaningfully lower than yours.
Do extra payments always go toward principal?
Not automatically. Many lenders apply extra payments to future interest or fees unless you specifically mark the payment as "apply to principal," so confirm this with your servicer.
Will paying off my mortgage early hurt my taxes?
You'll lose some mortgage interest deduction value as your balance shrinks, but for most homeowners the interest saved is larger than the tax deduction given up.
Is there a penalty for paying off a mortgage early?
Most modern mortgages don't carry prepayment penalties, but older loans or certain non-conforming loans sometimes do. Check your loan documents or ask your servicer before making large extra payments.
