Why 26 half-payments beat 12 full ones
A month is a little longer than four weeks — so while a monthly schedule produces 12 payments a year, a every-two-weeks schedule produces 26 half-payments, which is 13 full payments. That extra payment isn’t spread thin: it hits your principal directly. And since every dollar of principal you remove stops accruing interest for the whole remaining life of the loan, the effect compounds year after year.
This calculator simulates both schedules period by period with your real numbers: the monthly schedule at your current payment, and a biweekly schedule at exactly half that amount every two weeks. The difference in payoff date and total interest is shown above.
The free do-it-yourself alternative
You don’t need a special program to capture these savings. Two equivalent options most servicers support at no cost:
- Pay 1/12 extra each month. Divide your monthly payment by 12 and add that amount as an extra principal payment. Same math as biweekly, one transaction per month.
- Make one extra payment per year. A tax refund or bonus applied once a year to principal achieves nearly identical results.
Whichever route you choose, tell your servicer the extra amount is an additional principal payment — otherwise some will hold it as a prepayment of next month’s bill, which saves you nothing.
When biweekly payments are the wrong tool
Biweekly payments raise your annual outlay by about 8%. If your budget is tight, if you carry higher-interest debt (credit cards, personal loans), or if you haven’t maxed an employer 401(k) match, those dollars almost certainly work harder elsewhere. And if your goal is a lower monthly payment rather than a faster payoff, what you want is a mortgage recast instead.
Frequently asked questions
How do biweekly mortgage payments work?
Instead of one full payment per month, you pay half your monthly payment every two weeks. Because a year has 52 weeks, that adds up to 26 half-payments — the equivalent of 13 full monthly payments per year instead of 12. That one extra payment goes straight to principal, which shortens the loan and cuts total interest.
How much does paying biweekly actually save?
On a typical 30-year loan it removes roughly 4 to 6 years from the term and saves tens of thousands of dollars in interest, depending on your rate and balance. Use the calculator above with your own numbers — the higher your rate, the bigger the savings.
Should I use my lender’s biweekly payment program?
Be careful: some lenders and third-party services charge enrollment or per-transaction fees for biweekly plans, and some simply hold your half-payments until month-end, which eliminates most of the benefit. You can get the same result for free by paying 1/12 of your monthly payment as an extra principal payment each month.
Do biweekly payments lower my monthly payment?
No — the opposite trade. Your payoff date moves earlier and total interest drops, but you pay slightly more per year (13 monthly payments instead of 12). If you want a lower payment instead, look at a mortgage recast.
Is there a prepayment penalty for paying biweekly?
Most U.S. mortgages originated after 2014 have no prepayment penalty, but check your loan documents or ask your servicer before starting. Also confirm extra amounts are applied to principal, not held for the next payment.