One extra payment per year typically saves 4 to 7 years of payments and $40,000 to $100,000 in interest, depending on your loan balance, interest rate, and how far into the loan you are

The exact savings depend on three things: how much you still owe, what your interest rate is, and how many years remain on your loan. A borrower with a $300,000 loan at 6% interest with 25 years left will see different savings than someone with $150,000 at 4% with 10 years left. The earlier you make the extra payment, the more interest you avoid—because that payment goes straight to principal, and future interest accrues on a smaller balance.

One extra payment does not mean one extra payment total. It means making 13 payments in a year instead of 12, which you can do by paying one full monthly payment extra once per year, or by adding one-twelfth of your monthly payment to every regular payment. The math works the same either way.

Key Takeaways

  • One extra payment per year reduces your loan term by roughly 4 to 7 years and saves $40,000 to $100,000 in interest on a typical 30-year mortgage, though the exact amount depends on your balance, rate, and years remaining.
  • The extra payment must go to principal, not escrow or taxes—confirm with your lender that the payment is applied correctly before you send it.
  • Making the extra payment early in the loan saves more interest than making it late, because interest compounds on a smaller remaining balance.
  • You can make one lump-sum extra payment once per year, or add one-twelfth of your monthly payment to each regular payment; both methods produce the same result.
  • Some lenders charge a fee for extra payments or require you to request that the payment go to principal; check your loan documents or call your servicer before you start.

How the savings change across different loan scenarios

A $300,000 mortgage at 6% over 30 years costs roughly $215,000 in total interest. If you make one extra payment per year starting in year one, you pay off the loan in about 24 years instead of 30, and pay roughly $155,000 in interest—a savings of about $60,000. But if you wait until year 15 to start making extra payments, the savings drop to roughly $20,000 to $25,000, because half the interest has already accrued on the full balance.

A smaller loan or higher interest rate changes the math. A $150,000 mortgage at 4% over 30 years costs roughly $72,000 in total interest. One extra payment per year saves about $15,000 to $18,000 in interest and shortens the loan by roughly 3 to 4 years. A $400,000 mortgage at 7% over 30 years costs roughly $300,000 in total interest; one extra payment per year saves roughly $80,000 to $100,000 and shortens the loan by 5 to 7 years.

The pattern is consistent: the earlier you start, the larger the balance you are working with, and the higher your interest rate, the more one extra payment saves. But even late in the loan, an extra payment still reduces the number of months you owe money.

Why the extra payment goes to principal, not interest

When you make a regular monthly payment, your lender splits it between interest and principal. Early in the loan, most of the payment covers interest; late in the loan, most covers principal. An extra payment, by contrast, typically goes entirely to principal because the regular payment already covers that month's interest.

This is why you must confirm with your lender that the extra payment is applied to principal. Some servicers will apply it to your next month's payment instead, which does nothing for your payoff date. Others may hold it in escrow or apply it to taxes and insurance. Call your lender or log into your account and specify that the extra payment should reduce your principal balance immediately.

If your lender charges a fee for extra payments or requires a written request, that fee usually costs $25 to $50 per transaction. For most borrowers, the interest savings far outweigh the fee, but it is worth asking before you start.

The timing difference between one lump sum and monthly additions

You can make one extra payment all at once—say, in December—or you can add one-twelfth of your monthly payment to every regular payment throughout the year. The total amount is the same, but the timing affects how much interest you save.

If your monthly payment is $1,800, one-twelfth is $150. Adding $150 to each of your 12 payments means you pay down principal gradually throughout the year, which saves slightly more interest than making one $1,800 lump-sum payment in December. The difference is usually $100 to $300 per year—real money, but small compared to the total savings from the extra payment itself.

The practical choice depends on your cash flow. If you have $1,800 available in December, make a lump-sum payment. If you can only spare $150 per month, add it to each payment. Either way, you are ahead of where you would be making only 12 payments per year.

What happens to your monthly payment and loan term

Making extra payments does not lower your monthly payment. Your regular payment stays the same for the life of the loan (assuming a fixed-rate mortgage). The extra payment simply shortens how long you owe the money and reduces the total interest you pay.

If you make one extra payment per year for 30 years, you will pay off a 30-year loan in roughly 23 to 24 years. You will have made roughly 276 to 288 payments instead of 360. The lender will send you a final statement showing the loan is paid in full, and you stop making payments.

Some borrowers ask whether they can lower their monthly payment instead of shortening the loan. That requires refinancing, which is a separate transaction and usually involves closing costs and a new application. Refinancing makes sense if interest rates have dropped significantly, but it is not the same as making extra payments.

Risks and limits to watch for

Some mortgages include a prepayment penalty—a fee charged if you pay off the loan early or pay more than a certain amount per year. These are rare on modern mortgages but common on older loans or subprime mortgages from the 2000s. Check your loan documents for language about "prepayment penalty" or "early payoff fee." If you have one, the penalty may outweigh the interest savings from extra payments.

Adjustable-rate mortgages (ARMs) can make extra payments less predictable in their benefit. If your interest rate is set to increase in a few years, the interest savings from an extra payment today are real, but you may want to wait and see what your new rate will be before committing to a strategy.

If you are behind on your mortgage or in forbearance, do not make extra payments. Contact your lender first to understand your options and get current before you start paying down principal ahead of schedule.

How to set up extra payments with your lender

Log into your mortgage servicer's website or call the customer service number on your statement. Look for an option to make an extra payment or a payment above your regular amount. Some servicers let you schedule recurring extra payments (like $150 added to each payment); others require you to submit each extra payment individually.

When you submit the payment, confirm that it is labeled as going to principal. If the website does not make this clear, call and speak to a representative. Ask them to note in your account that all extra payments should reduce your principal balance, not be held or applied elsewhere.

Keep a record of each extra payment—the date, amount, and confirmation number. Your annual mortgage statement should show the reduced principal balance. If it does not, contact the servicer and ask for a correction.

Frequently Asked Questions

Can I make extra payments if I have an adjustable-rate mortgage?

Yes, but the benefit is harder to predict. If your rate is about to increase, the interest savings from an extra payment today are real, but you may want to wait until after the rate adjustment to see what your new payment will be. Once you know the new rate, extra payments still work the same way—they reduce principal and shorten the loan.

What if I can only afford an extra payment every few years, not every year?

Any extra payment saves interest and shortens the loan. One extra payment every three years saves less than one per year, but it still reduces your total interest and payoff date. The math scales: more extra payments mean more savings, but even one extra payment every few years is better than none.

Does making extra payments hurt my credit score?

No. Paying down your mortgage faster does not lower your credit score. It may slightly reduce your credit utilization ratio if you have other debts, but the effect is minimal and positive overall. On-time payments and lower debt are both good for your score.

Can I get the interest savings back if I sell the house before the loan is paid off?

No. If you sell before the loan is paid in full, you pay off the remaining balance from the sale proceeds. The interest you saved by making extra payments is gone—you do not get a refund. Extra payments make sense if you plan to stay in the home long enough to benefit from the shortened loan term.

What if my lender says they cannot apply extra payments to principal?

This is rare but possible with some servicers. Ask them in writing what options you have to pay down principal faster. If they refuse, you may be able to refinance with a different lender that allows extra payments without restrictions. Document their refusal in case you need it later.