Biweekly payments
Half the monthly amount every 2 weeks — 26 payments per year, equal to 13 monthly. Saves interest only if the servicer applies each partial to principal.
Reviewed May 2026.
Biweekly payments are a popular accelerated-payoff schedule. Half your normal monthly payment goes out every 2 weeks. Because there are 52 weeks in a year, that's 26 biweekly payments — equal to 13 monthly-equivalent payments instead of 12. The extra payment per year goes entirely to principal, accelerating payoff and saving interest.
The critical caveat: the math only works if your servicer applies each partial payment to principal as it arrives. Most servicers default to holding partials in a 'suspense account' until the full monthly amount accumulates, then applying it as a single payment. That neutralizes the benefit. Verify with your servicer in writing before switching schedules.
Weekly payments work the same way mathematically: 52 × (M/4) = 13M per year, identical to biweekly. The difference in lifetime interest is typically under $100 on a 30-year loan.
The DIY workaround that bypasses servicer cooperation: split your monthly payment into 12 portions and add 1/12 of it to each monthly payment as 'extra principal.' Same effect, no scheduling change, no fee, no servicer dependence.
PayoffMath angle. Biweekly is the same as paying one extra full monthly payment per year — when the servicer applies the partials correctly. The DIY version (one extra payment a year, or 1/12 extra each month) replicates the math without a setup fee and without depending on the servicer's habit.
Why it matters. Most articles treat 'biweekly = 4–6 years off your mortgage' as automatic. It isn't. The savings only show up if every partial payment lands on principal the day it arrives — and many servicers default to holding partials in a suspense account, which neutralizes the benefit entirely.
Common mistake. Paying a third party $300–500 to enroll in a biweekly program when the free DIY version produces the same payoff date. The fee adds nothing the schedule can't deliver on its own.
Try the biweekly payment calculator → — compare true biweekly, the free DIY workaround, and a vendor-fee program side by side on your specific loan.
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Sources and review
Reviewed May 2026. Glossary entries are plain-language definitions, not legal definitions. For account-specific rules, your loan documents control.
Definition by James L. Wu. Plain-language gloss, not a legal definition. For terms that show up in your loan paperwork, the governing language is in your loan documents. See the editorial policy for sourcing.