Quick answer: Paying half your mortgage payment every two weeks means 26 half-payments a year — the equivalent of 13 monthly payments instead of 12. That one extra payment a year, applied to principal, pays your loan off about 4–6 years early and saves tens of thousands in interest. Check "Show biweekly payment plan" below to see your numbers.
The biweekly trick works because of the calendar. There are 52 weeks in a year, so paying every two weeks produces 26 payments. At half your monthly amount, that adds up to 13 full monthly payments a year rather than 12 — and the extra one goes straight to principal.
You do not need a special loan to benefit. The calculator below shows your biweekly amount, your new payoff date, and the interest you would save.
Tip: check "Show biweekly payment plan" beneath the breakdown to see your biweekly amount, new payoff time, and total interest saved.
Mortgage payment calculator
P&I, tax, insurance, PMI & HOA — by loan type, all in one place
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How biweekly payments work
A standard mortgage is paid monthly — 12 payments a year. With a biweekly plan, you pay half the monthly amount every two weeks. Because the year has 26 two-week periods, you make 26 half-payments, which equals 13 full payments. That 13th payment, applied entirely to principal, is what accelerates the loan.
On a $320,000 loan at 6.85% over 30 years, switching to biweekly typically pays the loan off roughly 5–6 years early and saves well over $100,000 in interest — for the cost of about one extra payment per year.
Biweekly vs. just paying a little extra
Here is the key insight most biweekly pitches leave out: biweekly is just an automated way to make one extra payment a year. You can get the identical result by dividing one monthly payment by 12 and adding that to each monthly payment yourself — no new schedule required.
Watch for third-party biweekly "services." Some companies charge setup fees ($100–$400) and monthly fees to manage biweekly payments for you. There is no reason to pay this. Either ask your servicer to set up true biweekly payments for free, or simply add 1/12 of a payment to your monthly amount yourself — see our extra-payment calculator.
Should you set up biweekly payments?
Biweekly works best if:
- You are paid every two weeks, so the payments line up with your income.
- You want automatic, set-and-forget acceleration without thinking about it.
- Your servicer offers true biweekly (applying each half-payment as it arrives, not holding them).
It is less useful if your lender simply holds each half until the full monthly payment is assembled — that captures only the once-a-year extra payment, not the small interest savings from paying earlier each cycle. Always confirm how your servicer applies the payments.
Biweekly and your amortization
Because biweekly adds principal faster, it reshapes your amortization schedule — you cross into "more principal than interest" sooner and build equity faster, which can also help you drop PMI earlier on a conventional loan.
Biweekly vs. refinancing to a 15-year loan
Both strategies pay your mortgage off faster, but they work very differently. A 15-year mortgage usually carries a lower interest rate than a 30-year, so it saves even more interest — but it locks you into a much higher required monthly payment. If your income dips, you're still obligated to make it.
A biweekly plan on a 30-year loan is voluntary acceleration: you get a faster payoff and big interest savings, but your required payment stays at the lower 30-year amount. If money gets tight, you can pause the extra and revert to monthly payments with no penalty. For borrowers who want flexibility, biweekly (or simply paying extra principal) on a 30-year loan offers most of the benefit of a 15-year without the rigid commitment.
A $320,000 biweekly example, year by year
On a $320,000 loan at 6.85% over 30 years, the standard monthly payment is about $2,097. Split into biweekly halves of roughly $1,048 every two weeks, you make the equivalent of one extra payment each year. The result: you build 20% equity noticeably sooner (helpful for dropping PMI), cross the halfway point on your balance years ahead of schedule, and reach a zero balance around year 24–25 instead of year 30 — saving well over $100,000 in interest. Toggle the biweekly option above to see the exact figures for your loan.
Frequently asked questions
- CFPB — What is a biweekly mortgage? — federal explainer, including a warning about third-party biweekly payment fees.
- CFPB — Owning a home — official guidance on accelerating mortgage payoff.
- IRS Publication 936 — Home Mortgage Interest — reference for how mortgage interest works.
- FRED — 30-Year Fixed Mortgage Average — rate series used for the savings examples.
Last reviewed: June 1, 2026. See our data sources and editorial methodology for how we research every article.