Do Biweekly Mortgage Payments Really Save Money?
October 21, 2026
Paying half of your monthly mortgage payment every two weeks means 26 half-payments a year, which equals 13 full monthly payments instead of 12. That one extra payment goes straight to principal. On a $300,000, 30-year loan at 6.5%, the biweekly schedule pays the loan off in about 24.2 years instead of 30 and saves roughly $88,000 in interest.
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At 6.5% for 30 years, the monthly principal-and-interest payment is about $1,896. Over 360 payments the total interest is roughly $382,600. Splitting that payment in half and paying $948 every two weeks sends an extra $1,896 toward principal each year.
Modeled with interest accruing every two weeks, the loan is cleared after about 628 payments, roughly 24.2 years, with total interest near $294,500. That saves about $88,000 and cuts almost six years off the term.
| Schedule | Payment | Payoff time | Total interest |
|---|---|---|---|
| Monthly | $1,896 per month | 30 years | about $382,600 |
| Biweekly | $948 every two weeks | about 24.2 years | about $294,500 |
| Monthly + $200 extra | $2,096 per month | about 23.1 years | about $279,200 |
Where the Savings Actually Come From
Biweekly payments are not a special type of loan. The savings come from paying one extra monthly payment a year, earlier and in smaller pieces. You can get the same result, without a service, by adding one-twelfth of your payment (about $158 here) to each monthly payment.
Some lenders only apply a payment on the due date, which means half-payments sit unapplied and the savings shrink. Before you sign up for a biweekly program, confirm that payments are applied on receipt and ask about setup or per-payment fees, which can erase the benefit.
Monthly Extra Payments Compared
Adding a flat $200 a month to the same loan finishes it in about 277 months (23.1 years) and cuts interest to about $279,200, a saving of roughly $103,400. A flat extra amount larger than the biweekly equivalent naturally saves more, and it is easier to pause if cash gets tight.
Always tell the servicer that extra money should go to principal, not prepay future payments, otherwise it may not reduce interest.
Frequently Asked Questions
Are biweekly mortgage payments worth it?
They can be, if payments are applied immediately and fees are zero. On a $300,000 loan at 6.5%, they save about $88,000 in interest and about six years, but you can match the effect yourself with one extra payment a year.
Is biweekly the same as semi-monthly?
No. Biweekly means every two weeks, giving 26 payments a year. Semi-monthly means twice a month, giving 24 payments, which equals exactly 12 monthly payments and creates no extra principal.
Can I do biweekly payments without paying a service fee?
Yes. Make one extra monthly payment per year or add one-twelfth of your payment to each monthly payment, and designate the extra amount as principal-only.
Will extra payments change my monthly payment?
No. The required payment stays the same. Extra principal shortens the loan term instead, unless you ask the lender to recast the loan.