Do Biweekly Mortgage Payments Actually Save Money?
Quick answer
Paying half your mortgage payment every two weeks means 26 payments a year instead of 12 monthly ones. That's the same as 13 monthly payments, not 12, because 52 weeks divided by 2 is 26. On a $320,000 loan at 6.25% over 30 years, switching to biweekly saves $86,491.41 in interest and clears the loan about 5 years 8 months early. Simply paying 1/12 extra every month, with no special schedule, gets almost the same result: $85,619.55 saved, finishing one month later.
Biweekly mortgage payments are often sold as a clever trick, but what makes them work is plain arithmetic. A year has 52 weeks, and 52 divided by 2 is 26, not 24. So paying half your monthly payment every two weeks quietly adds one extra monthly payment each year.
This guide works out exactly what that extra payment is worth on a real loan, and compares it with simply paying a little more each month, which gives you the same benefit without any special payment schedule.
Why 26 payments a year isn't the same as 24
A monthly schedule means 12 payments a year. A biweekly schedule means one payment every 14 days, and 365 days divided by 14 is about 26.07, so in practice most years get 26 payments. Each one is half the normal monthly amount, so 24 of those 26 cover the 12 months just as before. The other 2 half-payments add up to one full extra monthly payment that the calendar slips in.
On a $320,000 loan at 6.25% over 30 years, the normal monthly payment is $1,970.30. Biweekly payments of half that, $985.15, come to $25,614.02 over the 26 payments in a year. That's $1,970.42 more than the $23,643.60 you'd pay with 12 monthly payments, which is, to within a few cents, one extra monthly payment.
What the extra payment is worth
Run the full biweekly schedule on the same $320,000 loan and the payoff moves from 30 years to about 24 years 4 months, 5 years 8 months sooner. Total interest falls from $389,306.21 to $302,814.80, a saving of $86,491.41.
You can try it on your own loan with the Mortgage Payoff Calculator. It models this exact biweekly schedule (26 half-payments a year, not a shortcut) side by side with paying extra each month or making a lump sum payment.
The do-it-yourself version gets almost the same result for free
Since the whole effect comes from paying roughly one extra monthly payment a year, you can spread that amount evenly instead. Adding 1/12 of your payment every month ($164.19 in this example) gives almost exactly the same outcome without a biweekly schedule: the loan is paid off in 293 months instead of 292, with $303,686.66 of interest instead of $302,814.80. The difference, $85,619.55 saved against $86,491.41, is under $900 on an interest bill of nearly $390,000.
True biweekly keeps a tiny edge because of timing rather than size. Paying a little off the balance every two weeks means interest is worked out on a slightly smaller balance a bit sooner. It's worth a small amount, but it isn't the main story.
- A do-it-yourself plan of 1/12 extra needs no sign-up, no special programme and no help from your servicer. You simply pay a little more with your normal monthly payment.
- Some mortgage servicers offer a formal biweekly programme, and some of them charge a setup or per-payment fee. Check before you sign up, because a fee can easily wipe out the small advantage over doing it yourself for free.
- Paying extra in either form only helps if your loan accepts extra principal payments without a prepayment penalty, so check your loan terms first.
Frequently Asked Questions
Do I need my lender to set up a biweekly program?
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No. You can get almost all of the benefit yourself by adding a little to your regular monthly payment (roughly 1/12 of it). As this guide shows, that comes within about $900 of true biweekly on a $320,000 loan, with no sign-up and no fees.
Why does biweekly save slightly more than the do-it-yourself version?
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Because paying part of the balance every two weeks brings it down a little sooner than one larger payment once a month, so slightly less interest builds up. The difference is real but small next to the main saving, which comes from the extra payment itself.
Does my mortgage servicer charge for biweekly payments?
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Some do, for a formal biweekly programme, so check with yours. Since paying a little extra each month gets almost the same result without any programme or fee, it's worth comparing the numbers before you pay to sign up.
Is there a downside to paying off a mortgage faster?
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The main one is that money you put into the mortgage isn't available for other goals or emergencies any more. Whether that's worth it also depends on your mortgage rate compared with what else you could do with the money.