What one extra payment does to your mortgage

Making one extra mortgage payment per year shortens your loan by several years and cuts the total interest you pay over the life of the mortgage. The exact savings depend on your interest rate, loan term, and how far into the loan you are when you start, but the math is straightforward: more principal paid down means less interest charged on the remaining balance.

The most common way to do this is to pay one-twelfth of your monthly payment every two weeks instead of paying the full amount once a month. Over a year, you end up making 26 half-payments, which equals 13 full payments instead of 12. Some people instead make a lump-sum payment once a year, or add a set amount to their regular monthly payment.

The catch is that this only works if your lender allows it without penalty. Some mortgages charge a prepayment penalty if you pay off principal faster than the schedule requires. Before you start, check your loan documents or call your lender to confirm there is no penalty for early payoff.

Key Takeaways

  • One extra payment per year typically shortens a 30-year mortgage by 4 to 6 years, depending on your interest rate and how soon you start.
  • The biweekly payment method (paying half your monthly payment every two weeks) is the easiest way to make this happen automatically.
  • You must confirm your lender allows prepayment without penalty before you start, because some mortgages charge fees for paying off principal early.
  • The higher your interest rate, the more interest you save by making extra payments, so this strategy works better on older mortgages or mortgages with rates above 5 percent.
  • Extra payments reduce the total interest paid but do not lower your monthly payment unless you refinance or modify the loan.

How the biweekly payment method works

The biweekly method divides your monthly payment by two and charges that amount every two weeks. If your monthly payment is $1,200, you pay $600 every 14 days. Since there are 26 two-week periods in a year, you pay $600 × 26 = $15,600 annually instead of $1,200 × 12 = $14,400.

That extra $1,200 goes straight to principal. Your lender applies it to the next payment cycle, reducing the balance faster and cutting years off the loan. The benefit compounds over time because you are paying interest on a smaller balance each month.

Some lenders offer biweekly payment programs directly through their servicing department. Others do not, so you may need to make the payments yourself by setting up a separate arrangement or using online bill pay. If your lender does not support biweekly payments, you can achieve the same result by adding one-twelfth of your monthly payment to each regular payment, or by making one lump-sum payment of one month's payment once a year.

The real savings: time and interest

The time saved depends on your loan term and interest rate. On a $300,000 mortgage at 6 percent interest over 30 years, making one extra payment per year typically cuts the loan down to about 24 to 25 years. At 4 percent, the reduction is smaller—roughly 26 to 27 years instead of 30. At 7 percent, you might reach payoff in 22 to 23 years.

Interest savings are larger at higher rates. On that same $300,000 loan at 6 percent, one extra payment per year saves roughly $40,000 to $50,000 in total interest. At 4 percent, the savings might be $20,000 to $30,000. At 7 percent, you could save $60,000 or more. These figures shift based on when you start making extra payments—starting early in the loan saves more interest than starting halfway through.

The trade-off is that your monthly payment stays the same. You are not reducing what you owe each month; you are just paying off the loan faster overall. If you need to lower your monthly payment, extra payments will not help—you would need to refinance instead.

When extra payments make financial sense

Extra mortgage payments are most valuable when your interest rate is high and you have the cash available without cutting into emergency savings or other financial goals. If your rate is 5 percent or higher, the interest you save usually outweighs other uses for that money. If your rate is 3 percent or lower, the math is weaker—you might earn more by investing the money elsewhere or keeping it liquid.

Extra payments also make more sense early in the loan, when most of your payment goes to interest. In the first five years of a 30-year mortgage, 80 to 90 percent of each payment is interest. By year 20, that flips—most of your payment goes to principal. Making extra payments in year 25 saves less interest than making them in year 5.

Consider your other financial priorities first. If you have high-interest debt (credit cards, car loans), no emergency fund, or are not saving for retirement, those should come before extra mortgage payments. If you have stable income, an emergency fund covering three to six months of expenses, and are on track with retirement savings, then extra mortgage payments become a reasonable option.

Prepayment penalties and lender restrictions

Before you make any extra payments, read your mortgage note or call your lender to check for a prepayment penalty clause. This clause allows the lender to charge you a fee if you pay off the loan faster than scheduled. Penalties are less common now than they were before 2008, but they still exist on some mortgages, especially those sold to investors or those with adjustable rates.

Penalties typically apply only during the first three to five years of the loan and are usually calculated as either a percentage of the loan balance (often 1 to 3 percent) or as a set number of months of interest. A $300,000 loan with a 2 percent penalty costs $6,000 if you trigger it. Some lenders allow you to pay a certain amount extra per year (often 10 to 20 percent of the annual payment) without penalty, but anything beyond that triggers the fee.

If your loan does have a penalty, you may still benefit from extra payments after the penalty period ends. For example, if the penalty expires in year 5, you could start making extra payments in year 6 and still save years of interest.

Alternatives to one extra payment per year

If making one full extra payment feels like too much at once, you can spread it across the year. Adding $100 per month to your regular payment achieves the same result as one lump-sum payment if your monthly payment is $1,200. This method is easier to budget for and works just as well.

Another option is to make extra payments only when you have the cash—a bonus, tax refund, or inheritance. This is less predictable but still reduces your loan term and interest. Even sporadic extra payments add up over time.

If you want to shorten your loan without changing your payment behavior, refinancing to a shorter term (15 years instead of 30) is another route. This raises your monthly payment but guarantees you will pay off the loan faster. Refinancing makes sense if rates have dropped since you took out your original loan, but it involves closing costs and a new application process.

Frequently Asked Questions

Will making extra payments hurt my credit score?

No. Paying down your mortgage faster does not hurt your credit. In fact, it may help slightly by lowering your overall debt-to-income ratio. Your credit score is based on payment history, credit mix, and amounts owed—paying early does not damage any of these factors.

Can I stop making extra payments if I need the money later?

Yes. Extra payments are voluntary, and you can stop at any time. Your regular monthly payment stays the same whether you make extra payments or not. If you hit a financial rough patch, you simply return to paying only the scheduled amount each month.

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

This depends on your interest rate and investment returns. If your mortgage rate is 6 percent and you could earn 8 percent in the stock market, investing might give you better returns. If your rate is 7 percent and you are unsure about investment returns, paying down the mortgage is a may provide "return" equal to your interest rate. Consider your risk tolerance and time horizon before deciding.

Do extra payments lower my monthly payment amount?

No. Extra payments shorten the loan term but do not change your monthly payment. You will still owe the same amount each month until the loan is paid off. If you want a lower monthly payment, you would need to refinance the mortgage.

What if I make extra payments and then need to sell the house?

You simply pay off the remaining balance at closing. The extra payments you made reduce what you owe, so you walk away with more equity. There is no penalty or clawback for paying off early when you sell.