Splitting a monthly mortgage payment in half and paying it every two weeks sounds like the same money paid differently. It isn’t — the calendar quietly adds an extra payment a year.
How it works
A year has 52 weeks, so paying every two weeks makes 26 payments a year, not 24. Twenty-six half-payments equal 13 full monthly payments — one more than the 12 a standard monthly schedule makes. As Cornell’s Legal Information Institute puts it, that “results in 13 full payments annually, which can reduce interest costs and shorten the loan term.” That extra payment goes straight to principal, and because interest is calculated on a shrinking balance, paying principal down sooner also reduces every interest charge that follows it.
Why this is different from just paying extra
This site’s extra-payment calculator lets you choose any extra amount by hand. Biweekly payment doesn’t require choosing anything — the extra payment is a mechanical side effect of the two-week calendar, which is exactly why some companies charge a signup fee to “enroll” borrowers in something they could set up for free with their own bank’s bill pay, a point the CFPB has pursued enforcement action over.
What this does not include
This assumes every extra dollar from the 13th payment goes straight to principal with no fee — some third-party “biweekly payment” services charge setup or per-transaction fees that eat into the savings shown here, which is exactly the practice the source above warns about. It also assumes the mortgage servicer applies biweekly payments as received rather than holding them until a full monthly amount accumulates; not every servicer does, so it’s worth confirming before switching.
How to use this calculator
- Enter the loan amount, annual interest rate, and term in years.
- The calculator compares the standard monthly schedule against the biweekly schedule automatically.
- Compare the interest saved and years shaved off against any fee your bank or servicer might charge to switch.
Frequently asked questions
Can I get the same effect without paying a fee?
Yes — sending one extra full payment a year, or a bit extra each month, to principal achieves the same result as a biweekly schedule without paying anyone to set it up, which is exactly what the CFPB recommends.
Does my mortgage rate change with biweekly payments?
No. The rate is unchanged; only the extra annual payment and the resulting faster principal paydown produce the interest savings.
Will my lender automatically apply biweekly payments this way?
Not always — some servicers hold partial payments until they add up to a full monthly payment before applying them, which delays the benefit. Confirm how your specific servicer handles it before switching.
Does a 0% loan benefit from biweekly payments?
Yes, though only through faster payoff, not interest savings — with no interest to reduce, the calculator still shows the term shortening because the principal is retired sooner.
