An extra mortgage payment cuts years off your loan and saves thousands in interest, but only if your lender allows it and you have the cash without sacrificing other financial needs.

Making one additional full mortgage payment per year — or paying extra toward principal each month — reduces the total interest you pay and shortens your loan term. A 30-year mortgage at 6% interest, for example, becomes roughly a 24-year mortgage if you add one full payment annually. The catch is that not all lenders accept extra payments without penalty, and not all borrowers should prioritize this over building emergency savings or paying down higher-interest debt.

Before you send extra money to your lender, you need to know three things: whether your loan allows it, whether it actually goes toward principal, and whether you can afford it without creating financial strain elsewhere.

Key Takeaways

  • Check your promissory note or call your lender to confirm your loan has no prepayment penalty and that extra payments go directly to principal, not into escrow or next month's payment.
  • Paying one extra full payment per year can reduce a 30-year mortgage to roughly 24 years and save tens of thousands in interest, depending on your rate and loan balance.
  • Extra payments only make financial sense if you have already built an emergency fund, paid off credit cards, and can afford them without cutting into other savings.
  • You must instruct your lender in writing to apply extra payments to principal; many lenders default to holding the money or applying it to your next scheduled payment instead.

Check for prepayment penalties and confirm where the money goes

Some mortgages, particularly older loans or those with adjustable rates, include a prepayment penalty — a fee charged if you pay off the loan early or pay significantly more than required. These penalties typically expire after three to five years, but you need to know whether yours exists before sending extra money.

Pull out your promissory note (the document you signed at closing) or call your lender's customer service line and ask directly: "Does my loan have a prepayment penalty?" If the answer is yes, ask when it expires. If it is no, ask the second question: "If I send extra money, where does it go?" Many lenders will apply extra payments to your next scheduled payment, hold them in escrow, or put them toward property taxes and insurance instead of reducing your principal balance. You need written confirmation that extra payments go directly to principal.

Request this confirmation in writing — email works — so you have a record. When you make the payment, include a note with the check or online payment stating "Apply this amount to principal only" or "Do not apply to next month's payment." Some lenders require a separate form; ask for it by name.

Understand the real savings from extra payments

The benefit of extra payments depends on your interest rate, how much extra you pay, and how long you stay in the home. A borrower with a $300,000 mortgage at 6% interest over 30 years pays roughly $215,000 in total interest. Adding one extra $1,800 payment per year reduces that interest to about $155,000 — a savings of $60,000 — and shortens the loan to about 24 years.

At a lower rate, say 3.5%, the same extra payment saves roughly $35,000 in interest. At a higher rate, say 7%, it saves roughly $85,000. The higher your rate, the more you save. The longer you stay in the home, the more you benefit; if you sell in five years, you may save only a few thousand dollars in interest, which may not justify the opportunity cost of that money elsewhere.

Use a mortgage calculator that shows total interest paid to compare your scenario. Enter your loan amount, rate, and term, then run it again with an extra annual payment or monthly extra amount. The difference is your actual savings — not a projection, but a concrete number for your specific loan.

Decide whether extra payments fit your financial priorities

Extra mortgage payments make sense only after you have handled higher-priority financial needs. If you carry credit card debt at 18% interest, paying that down first saves you more money than paying extra on a 5% mortgage. If you have no emergency fund, an extra mortgage payment leaves you vulnerable to a job loss or major repair.

Ask yourself these questions in order: Do I have three to six months of living expenses in a savings account? Have I paid off credit cards and other high-interest debt? Am I contributing enough to retirement savings to get my employer match? Only after answering yes to all three should you consider extra mortgage payments.

If you have money left over after those priorities and want to accelerate your mortgage payoff, extra payments are a reasonable choice. But if you are stretching to make them, or if they prevent you from saving for a new roof or car replacement, they are not worth the risk.

The difference between one extra payment per year and monthly extra amounts

You can make an extra mortgage payment once per year (often called a "13th payment" strategy), or you can add a small amount to your regular monthly payment. Both reduce principal and interest, but they work differently.

One extra full payment per year saves the most interest because that lump sum immediately reduces your principal balance, and you stop paying interest on that amount for the remaining loan term. Monthly extra amounts are smaller and easier to budget for, but they accumulate more slowly. A $150 extra payment each month totals $1,800 per year, which is close to one full payment, but the timing means you save slightly less interest because the money enters the account gradually.

Choose whichever fits your cash flow. If you receive a bonus or tax refund, a lump-sum extra payment is simple. If you prefer steady monthly discipline, add to your regular payment. The key is consistency and confirming with your lender that the money goes to principal.

How to set up extra payments with your lender

Contact your lender and ask how they accept extra principal payments. Some allow you to pay online through your account portal with a note attached. Others require a separate form or a phone call to set up. A few still require a check with a written instruction.

Once you know the method, make your first extra payment and then verify it posted correctly. Log into your account or call and confirm that the payment reduced your principal balance, not your next payment date. If it did not, contact the lender immediately and ask them to correct it. Do not assume it will be applied correctly the second time if the first payment went to the wrong place.

If you set up automatic extra payments, review your account quarterly to make sure they are still being applied to principal. Lender systems change, and a payment that was correctly applied one month may be mishandled the next.

When extra payments do not make sense

Do not make extra mortgage payments if you are underwater on your loan (owe more than the home is worth), if you plan to sell within five years, or if you are struggling to meet other financial obligations. Extra payments lock money into your home equity, which you cannot access without refinancing or a home equity loan. If you need liquidity, that money is harder to reach.

If you have a very low interest rate — below 3% — the opportunity cost of extra payments may be high. Money invested in a diversified portfolio historically returns more than the interest you save on a low-rate mortgage. This is not a may provide, but it is worth considering if you have a strong risk tolerance and a long time horizon.

If your mortgage is an adjustable-rate loan that will reset to a higher rate soon, focus on refinancing or building cash reserves instead. An extra payment now may not help if your payment doubles in two years.

Frequently Asked Questions

Will making extra payments hurt my credit score?

No. Extra payments reduce your loan balance and show responsible payment behavior. They do not negatively affect your credit. Your score may actually improve slightly over time because your debt-to-income ratio improves.

Can I get the extra money back if I need it?

No. Once you pay extra principal, that money is part of your home equity and cannot be withdrawn without refinancing, taking out a home equity loan, or selling the home. This is why you should only make extra payments if you are certain you will not need that cash.

What if my lender applies my extra payment to the wrong place?

Call immediately and ask them to correct it. Request written confirmation that the payment has been reapplied to principal. If they refuse or make repeated errors, file a complaint with the Consumer Financial Protection Bureau (CFPB) or your state's banking regulator.

Does paying extra on my mortgage affect my taxes?

No. Only the interest portion of your mortgage payment is tax-deductible, and extra principal payments do not generate interest. Paying extra does not change your tax situation.

Should I make extra payments if I have a 15-year mortgage instead of a 30-year?

Probably not. A 15-year mortgage already builds equity quickly and costs far less in total interest than a 30-year loan. The money you would use for extra payments is usually better spent on retirement savings or other financial goals.