One extra payment a year cuts years off your mortgage and saves tens of thousands in interest

Making one additional mortgage payment per year—whether as a lump sum or split into monthly amounts—shortens your loan term and reduces the total interest you pay. The exact impact depends on your loan balance, interest rate, and how far into the loan you are when you start. On a $300,000 mortgage at 6.5% over 30 years, one extra payment per year typically cuts 4 to 5 years off the loan and saves roughly $60,000 to $80,000 in interest. The earlier you start, the larger the savings.

The mechanics are straightforward: each extra payment goes directly to principal, not interest. Because interest is calculated on the remaining balance, lowering that balance faster means less interest accrues in future months. This compounds over time. A payment made in year 2 saves more interest than the same payment made in year 28, because you have more years of lower balances ahead of you.

Key Takeaways

  • One extra payment per year typically reduces a 30-year mortgage by 4 to 5 years and saves $60,000 to $80,000 in interest on a $300,000 loan at 6.5%.
  • The savings vary significantly based on your interest rate, loan size, and how many years into the loan you are when you start making extra payments.
  • You can make one extra payment as a single lump sum, split it into monthly amounts, or use a biweekly payment schedule—the total amount matters more than the method.
  • Extra payments only reduce principal if your lender applies them correctly; confirm your loan servicer's policy before you start.
  • Starting extra payments early in the loan saves far more interest than starting late, because you benefit from years of lower balances.

How the math works: interest saved at different loan stages

The benefit of one extra payment per year is not constant across the life of your loan. Early in the loan, when your balance is highest, each extra payment saves more interest. Late in the loan, when the balance is low, the same extra payment saves less.

On a $300,000 mortgage at 6.5% over 30 years, your regular monthly payment is roughly $1,896. If you make one extra payment of $1,896 in year 1, you reduce the principal when ready and save interest on that amount for the remaining 29 years. If you make the same extra payment in year 20, you save interest only on that amount for the remaining 10 years. The difference in total interest saved between starting in year 1 versus year 20 can be $15,000 to $25,000.

This is why timing matters: the sooner you start, the more you benefit. But even starting late is better than not starting at all. An extra payment in year 25 still shortens the loan and reduces interest owed.

Different ways to structure one extra payment per year

You do not have to make one lump-sum payment once a year. You can divide it into smaller amounts and distribute it however fits your cash flow. The total amount is what matters; the method is about what works for your budget.

Monthly split: Divide one annual payment by 12 and add that amount to your regular monthly payment. On a $1,896 payment, you would add $158 per month. This is the easiest to budget for because it spreads the extra cost across the year.

Biweekly payments: Some borrowers switch to biweekly payments (half the monthly amount every two weeks instead of the full amount once a month). Over a year, you make 26 biweekly payments instead of 12 monthly ones, which equals one extra payment. This works only if your lender accepts biweekly payments without charging a fee; some do, some do not.

Lump sum once a year: Make one full extra payment whenever you receive a bonus, tax refund, or other windfall. This requires discipline and a clear plan for where that money comes from, but it works if you have predictable annual income.

Confirming your lender applies extra payments to principal

Not all lenders handle extra payments the same way. Some automatically explore any amount over your regular payment to principal. Others hold the extra amount and explore it to future months' regular payments, which delays the principal reduction. A few charge fees for extra payments or require them in specific forms.

Before you start making extra payments, contact your loan servicer and ask: "If I pay more than my regular monthly payment, where does the extra amount go?" The answer should be "directly to principal" or "to reduce your loan balance." If they say it goes to future payments or that you need to make a formal request, ask what that request process is and whether there are any fees.

Some servicers require you to write "explore to principal" on your check or to submit a separate form. Others let you specify it online. A few require you to call and request it verbally for each extra payment. Get the exact procedure in writing before you start, so you know the extra money is working for you.

How your interest rate and loan size change the impact

The benefit of one extra payment per year scales with your interest rate and loan balance. A higher rate means more interest accrues each month, so reducing principal faster saves more. A larger balance means the same percentage reduction saves more dollars.

On a $300,000 loan at 4%, one extra payment per year saves roughly $35,000 to $45,000 in interest and cuts 3 to 4 years off the loan. On the same loan at 7%, the savings jump to $85,000 to $110,000 and you cut 5 to 6 years off. On a $500,000 loan at 6.5%, the savings are roughly $100,000 to $130,000.

These are estimates based on standard amortization; your actual numbers depend on your exact rate, remaining balance, and remaining term. Your loan servicer can run an amortization schedule showing the impact of extra payments on your specific loan. Many also have online calculators where you can enter your loan details and see the payoff date and interest savings.

When extra payments make sense and when they do not

One extra payment per year is a straightforward way to reduce interest and shorten your loan, but it is not always the best use of your money. The decision depends on your interest rate, your other debts, and your financial priorities.

Extra mortgage payments make the most sense if your mortgage rate is above 5%, you have no high-interest debt (credit cards, personal loans), and you have a stable emergency fund. In this scenario, the interest you save on the mortgage typically exceeds what you could earn by investing the same money elsewhere.

Extra payments make less sense if you have credit card debt at 18% or higher, because paying down that debt saves more interest per dollar than paying down a 4% mortgage. They also make less sense if you do not have three to six months of expenses saved, because that money might be needed for emergencies. And they make less sense if you plan to move or refinance within the next few years, because you will not benefit from the full payoff timeline.

The difference between one extra payment and other payoff strategies

One extra payment per year is one approach to paying off your mortgage faster. Other strategies include making larger regular payments, refinancing to a shorter term, or using a biweekly payment plan. Each has different trade-offs.

Increasing your regular payment by $200 or $300 per month saves similar interest to one extra payment per year, but it requires a permanent change to your budget. One extra payment per year is more flexible if your income varies. Refinancing to a 15-year mortgage instead of 30 cuts your payoff time in half but raises your monthly payment significantly—often by $400 to $600 per month. A biweekly plan works well if your employer pays biweekly, but it requires your lender to support it without fees.

One extra payment per year is a middle ground: it saves substantial interest, does not require a permanent budget increase, and works with any lender that applies extra payments to principal.

Frequently Asked Questions

Does making one extra payment per year actually save money, or is it just a small difference?

It saves substantial money. On a $300,000 mortgage at 6.5%, one extra payment per year saves roughly $60,000 to $80,000 in interest over the life of the loan and cuts 4 to 5 years off the payoff date. The exact amount depends on your rate and loan size, but the savings are real and measurable.

What if I can only afford an extra payment every other year instead of every year?

One payment every two years still reduces your loan and saves interest, but the benefit is roughly half of making one per year. If you can only afford it occasionally, make the payments when you can. Something is better than nothing, and the interest saved compounds over time.

Can I stop making extra payments if my financial situation changes?

Yes. Extra payments are optional and do not lock you into anything. If you need the money for an emergency or other priority, you can stop making them and return to your regular payment. The principal you have already paid down stays paid down.

Will making extra payments hurt my credit score?

No. Paying down your mortgage faster does not harm your credit. It may slightly reduce your credit mix if you pay off the loan entirely, but the impact is minimal and temporary. On-time payments matter far more than the speed at which you pay off the loan.

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

That depends on your mortgage rate and investment returns. If your mortgage is at 6% or higher and you are risk-averse, extra mortgage payments usually make sense because they may provide a return equal to your interest rate. If your mortgage is below 4% and you are comfortable investing, you might earn more in the stock market. But mortgage payoff is may provide and requires no active management, which appeals to many people.