Biweekly vs Monthly Mortgage Payments: Save Years and Thousands
Paying biweekly produces 13 monthly payments a year. See how much interest it saves and whether a DIY extra payment beats it.
Paying half your mortgage every two weeks produces 26 half-payments — 13 full payments a year — which typically cuts 4–5 years and tens of thousands in interest off a 30-year loan.
What you'll walk away with
Skim these first — then dig into the details below.
- 1Biweekly means half your monthly payment every two weeks — 13 full payments per year.
- 2On a mid-size mortgage that can cut 4–5 years and tens of thousands in interest.
- 3The DIY version: divide your payment by 12 and add that to each monthly payment.
- 4Confirm your servicer applies extra funds to principal immediately, not as a held prepayment.
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Biweekly payments are the least painful way to pay a mortgage off early. Because there are 26 two-week periods in a year, you make one extra full payment without ever writing a large check.
It works especially well if you are paid every two weeks, since the cash flow lines up naturally.
The math
The savings come entirely from that thirteenth payment going straight to principal.
- 26 half-payments per year equals 13 full payments instead of 12.
- The extra payment reduces principal, so all future interest is calculated on a smaller balance.
- On a $350,000 loan at 7%, the extra roughly $2,300 per year compounds into major savings.
- The earlier you start, the larger the effect — see amortization explained.
Biweekly vs the DIY method
You can capture nearly all of the benefit without changing your payment schedule at all.
- 1
Divide your monthly payment by 12.
- 2
Add that amount to every monthly payment, labeled principal only.
- 3
Keep your normal single monthly due date and autopay setup.
- 4
Increase the extra amount whenever your income rises.
Watch out for these
A few servicer details can erase the benefit.
- Third-party biweekly programs may charge setup and per-transaction fees for something you can do free.
- Some servicers hold the half-payment until the full amount arrives, delaying the principal credit.
- Extra funds may be applied as a prepaid future payment rather than to principal unless you specify.
- Confirm there is no prepayment penalty on your loan.
Should you pay extra at all?
Extra principal is a guaranteed return equal to your mortgage rate — sometimes that is the best use of the money, sometimes not.
- Pay extra if your rate is high and you value a guaranteed, risk-free return.
- Invest instead if your rate is low and you have decades of horizon.
- Always finish the emergency fund and clear high-interest debt first.
- If rates have fallen, compare paying extra against refinancing using the refinance calculator.
Disclaimer: This page includes AI-assisted educational content reviewed for general accuracy. It is not personalized financial, tax, or legal advice. Verify numbers with a qualified professional and our editorial standards.
Continue reading
Related guides that deepen the same decision.
Amortization Schedule Explained: How Loan Payments Really Work
Amortization spreads a loan into equal payments, but early payments are mostly interest and late payments are mostly principal — which is why extra principal early saves the most.
ReadReal EstateHow to Calculate Your Mortgage Payment (Formula + Examples)
Your monthly principal and interest come from the standard amortization formula — but budget for PITI, which adds property taxes, insurance, and PMI to that number.
ReadReal EstateWhen To Refinance Your Mortgage: Rules, Math and Break-Even (2026)
Refinance when the rate drop saves enough monthly to recoup your closing costs before you plan to move — usually a 0.75–1% drop with a break-even under 2–3 years.
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