Biweekly vs Bimonthly Mortgage Payment Calculator 2027
Compare biweekly (26 payments/year) vs bimonthly (24 payments/year) mortgage strategies — biweekly = 1 extra payment annually, shaves 4-7 years off 30-year loan.
Biweekly vs Bimonthly Difference
BIWEEKLY = every 14 days = 26 half-payments = 13 monthly equivalents per year (one extra). BIMONTHLY = twice per month (1st & 15th) = 24 half-payments = 12 monthly equivalents (no extra).
Why Biweekly Saves Money
The extra annual payment goes 100% to principal. On a $350k 30-year at 6.5%, biweekly cuts ~5 years off term and saves ~$60k interest. Effect compounds because lower balance = less interest.
Lender vs DIY Biweekly
Lender biweekly programs charge $300-$500 setup fee. You can DIY by paying 1/12 extra monthly OR making 1 extra payment annually — same effect, zero fee. Confirm payment applies to PRINCIPAL.
Prepayment Penalty Check
Most modern US mortgages have NO prepayment penalty (banned for QM loans). Some non-QM, jumbo, or older loans have penalties for 2-5 years. Read your note carefully.
Source: cfpb.gov mortgage prepayment guide. Last updated: May 2026.
Frequently Asked Questions
Does the lender hold my half-payment?
Lender programs hold first half-payment for 2 weeks and apply both halves on the monthly due date. So no true biweekly interest savings beyond the extra annual payment.
What if I have 401k match instead?
401k match (typ 50-100% return immediately) almost always beats 6.5% mortgage savings. Max match first, then biweekly mortgage with leftover cash.
Is biweekly worth it on a 15-year loan?
Less impact since you're already paying down principal fast. Cuts about 2 years off a 15-year vs 5 years off a 30-year. Math still positive.