Biweekly vs Monthly Mortgage Payments

What's actually happening

A "biweekly" mortgage charges half the monthly payment every two weeks. There are 52 weeks in a year, so 26 biweekly payments per year = 13 monthly equivalents. You're paying one extra month per year — straight to principal — without it feeling like extra.

That single extra payment compounds dramatically because of how amortization works. The extra principal shrinks the balance, which shrinks future interest, which lets more of each future payment go to principal. The cycle accelerates the payoff.

The catch your lender doesn't mention

Most mortgage servicers don't actually accept biweekly payments. They hold each half-payment until they have a full one, then apply it. The "biweekly program" they sell you (often with a $300+ enrollment fee) just does the math for you — you can replicate it for free by sending an extra 1/12 of your payment each month, or by making one full extra payment each year.

Other ways to get the same result

• Extra 1/12 each month. Take your monthly payment, divide by 12, add that to each month. Mathematically identical to biweekly.
• One extra payment per year. Send a full payment in addition to your regular 12. Same payoff savings, easier to remember.
• Recast. Lump-sum extra payment + ask the servicer to "recast" — they recalculate your monthly with the new balance over the original term. Lowers the payment instead of shortening the term.

When biweekly isn't worth bothering with

• You'll move or refinance in <5 years (you won't be on the loan long enough to capture the savings).
• Your servicer charges a fee for biweekly enrollment (it usually isn't worth it).
• You'd rather put the extra payments toward a higher-return investment.