# Mortgage Payoff Calculator

> Free mortgage payoff calculator: enter your loan, rate, term and extra monthly payment to see your payoff date, total interest and how much extra payments save you.

See what an extra payment each month does to your mortgage: the payoff date, the total interest with and without it, and exactly how much you save.

*Interactive tool: enter your values at https://toollantern.win/mortgage-payoff-calculator/ and results update instantly in your browser.*

## What this calculator does

This mortgage payoff calculator simulates your loan month by month. Enter the loan amount, the annual interest rate, the original term and any extra amount you pay toward the principal each month. It then shows your payoff date, how long the loan really lasts, the total interest you will pay, and how much interest the extra payments save compared with making only the minimum payment.

## How the math works

Your regular monthly payment comes from the standard amortization formula:

- **Monthly payment** = P × i ÷ (1 − (1 + i)−n), where P is the loan amount, i is the monthly rate (APR ÷ 12) and n is the number of months.

- Each month, the interest charge is the remaining balance × i, and everything above that reduces the principal.

- An extra payment goes straight to principal, which shrinks the next month's interest charge. The effect compounds: every extra dollar kills future interest on itself.

## Worked example

A **$400,000** loan at **6.5%** over **30 years** has a standard payment of about **$2,528 a month** and costs about **$510,000 in total interest**. Add an extra **$300 a month** and the loan is paid off in about **269 months (roughly 22.5 years)**, with total interest of about **$361,000**. That is roughly **$149,600 less interest** and about **7.5 years** off the loan, from $300 a month.

## Why extra payments are so powerful

In the early years of a 30-year loan, most of your payment is interest. Cutting the principal early removes interest charges from every remaining month at once. That is why even a modest extra payment, started early and kept up, can shave years off a mortgage. Lump sums (a bonus, a tax refund) work the same way: applied to principal, they skip you forward on the amortization schedule.

## Limitations

This is an estimate. It assumes a fixed rate, no prepayment penalty, no escrow changes, and that every extra dollar goes to principal (confirm with your servicer that it is applied that way). It does not model refinancing, adjustable rates, or the opportunity cost of investing the extra money instead. Always check your loan documents for prepayment terms.

## Frequently asked questions
### Does making extra mortgage payments actually save money?

Yes. Extra payments go directly to principal, which reduces the interest charged every following month. Even $100 to $300 extra a month can save tens of thousands in interest and cut years off a 30-year loan.

### Should I make extra mortgage payments or invest the money instead?

It depends on the math and your risk tolerance. Paying down a 6 to 7 percent mortgage is a guaranteed return at that rate. Investing may return more over decades but carries risk. Many people split the difference: extra principal payments plus retirement contributions.

### Do extra payments reduce my required monthly payment?

No, not on a standard fixed-rate mortgage. Your required payment stays the same; the loan simply ends sooner. Some lenders offer a recast (re-amortization) for a lump sum, which does lower the payment.

### Is there a penalty for paying off my mortgage early?

Most modern US mortgages have no prepayment penalty, but some loans do, especially certain non-qualified or investment-property loans. Check your loan documents or ask your servicer before making large extra payments.

### What happens after I pay off my mortgage?

You own the home free and clear, the lien is released, and you stop paying principal and interest (you still owe property taxes and insurance). Many lenders require you to keep escrow funded through the payoff.

### Is this calculator's estimate exact?

It is very close for fixed-rate loans, but it is still an estimate. Servicers round payments, escrow changes yearly, and rate adjustments on ARMs change the picture. Use it for planning, then confirm figures with your lender.

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Interactive version: https://toollantern.win/mortgage-payoff-calculator/