Do Biweekly Mortgage Payments Save Money? (2026)

Where the extra payment comes from

The trick is in the calendar. A month is a bit longer than four weeks, so paying every two weeks squeezes in an extra half payment twice a year without it ever feeling like more.

26 half payments × ½ = 13 full payments a year

That 13th payment is pure extra principal, and because it lands every year, its effect compounds over the life of the loan.

A worked example

Worked example: $360,000 loan at 6.5 percent, 30 years

Monthly payment$2,275
Standard total interest (30 years)$459,160
Effect of one extra payment a yearloan clears in ~24.2 years
Total interest with the 13th payment$354,453
Interest saved≈ $104,708
Time saved≈ 5.8 years

The same loan finishes almost six years early and saves over 100,000 dollars in interest, just from restructuring how often you pay.

Before you set it up

A few cautions make the difference between saving money and wasting it:

Avoid paid enrollment plans. Some servicers or third parties charge a setup or per payment fee for biweekly programs. You can get the identical result for free by simply paying one twelfth extra each month, or making one extra payment a year yourself.
Confirm the extra goes to principal. The savings only happen if the servicer applies the additional money to principal rather than holding it for the next due date.
Check for prepayment penalties. Rare on modern mortgages, but worth a look.

The simplest free version: add one twelfth of your payment to each monthly check and label it extra principal. Same result, no middleman.

Frequently asked questions

How do biweekly payments save money?

Paying half your mortgage every two weeks results in 26 half payments a year, which equals 13 full payments instead of 12. That extra payment reduces principal, so you pay interest on a smaller balance and clear the loan years early.

Can I just make one extra payment a year instead?

Yes, and it produces nearly the same result for free. Adding one twelfth of your payment to each monthly bill, or sending one full extra payment once a year, mimics a biweekly plan without any enrollment fee.

Do biweekly payment programs cost anything?

Some servicers or third party services charge setup or transaction fees to run a biweekly plan. Those fees are unnecessary. You can achieve the identical payoff by overpaying principal yourself, so avoid paid programs.

Will my lender apply the extra to principal automatically?

Not always. Confirm with your servicer that additional funds are applied to principal immediately rather than parked toward the next scheduled payment, otherwise the interest savings do not happen.