Paying half your mortgage every two weeks instead of the full amount monthly clears the loan years early and saves a great deal of interest. The mechanism is simpler than it looks — and you can usually get the same result without paying anyone a fee.
Why it works
There are 52 weeks in a year, so paying every fortnight means 26 half-payments — the equivalent of 13 monthly payments rather than 12.
That thirteenth payment goes entirely to principal. On a $400,000 loan at 6.5% it removes nearly six years from a thirty-year term and saves well over $100,000 in interest.
A smaller secondary benefit comes from paying slightly earlier each month, which marginally reduces the interest accrued.
Biweekly payment = monthly payment ÷ 2 26 payments per year = 13 monthly equivalents
You can usually do this yourself for free
Many servicers charge a setup fee and sometimes a per-payment charge to enrol you in a formal biweekly programme. Some third-party companies charge considerably more.
Dividing your monthly payment by twelve and adding that amount to each monthly payment achieves almost exactly the same outcome at no cost. The calculator shows both so you can see how small the difference really is.
Before enrolling in any paid programme, confirm the servicer applies each half-payment on arrival. Some hold the money and remit monthly, which eliminates the benefit entirely while still charging you.
Check these first
- Prepayment penalties — uncommon now, but verify before accelerating.
- How extra payments are applied. They must reduce principal, not be held as a future payment.
- Whether your income arrives fortnightly. If you are paid every two weeks, this schedule aligns naturally with your cash flow.
- Whether higher-interest debt exists. Clearing a credit card at 22% beats overpaying a mortgage at 6.5% every time.
- Whether your emergency fund is intact. Money paid into a mortgage is difficult to retrieve without borrowing it back.
Is early payoff the best use of the money?
Overpaying a mortgage gives a guaranteed, risk-free return equal to your interest rate. At 6.5% that is genuinely attractive, and unlike market returns it is certain.
Against that, retirement contributions may carry an employer match — an immediate 50–100% return that no mortgage rate approaches. Mortgage interest may also be deductible, lowering the effective rate.
A reasonable order is: capture the full employer match, clear high-interest debt, build an emergency fund, then decide between overpaying the mortgage and investing based on your rate and your appetite for risk.
Worked example
Using the values pre-loaded in the calculator above:
| Input | Value |
|---|---|
| Loan amount ($) | 400000 |
| Interest rate (%) | 6.5 |
| Term (yrs) | 30 |
| Servicer setup fee ($) | 0 |
| Per-payment service charge ($) | 0 |
| Output | Value |
|---|---|
| Biweekly payment | $1,264.14 |
| Standard monthly payment | $2,528.27 |
| Extra paid per year | $2,528.27 |
| Monthly schedule | 30 years |
| Biweekly schedule | 24.2 years |
| Time saved | 5.8 years |
| Monthly total interest | $510,177.95 |
| Biweekly total interest | $392,682.25 |
Frequently asked questions
How much does a biweekly mortgage save?
On a $400,000 loan at 6.5% over 30 years, roughly $117,000 in interest with payoff about six years early. The saving scales with the balance, rate and remaining term.
Is a biweekly mortgage worth the fee?
Usually not. Adding one twelfth of your payment to each monthly payment produces nearly identical results for free. Only consider a paid plan if you need the automation to stay disciplined.
Does biweekly payment hurt my credit score?
No. Payments are reported as on time either way, and the faster reduction in balance is mildly positive.
Can I stop a biweekly plan later?
Formal programmes can generally be cancelled, though some charge to do so. Simply paying extra voluntarily carries no commitment at all, which is another argument for the do-it-yourself approach.
Should I pay off my mortgage early or invest?
Overpaying gives a guaranteed return equal to your rate; investing offers higher expected returns with risk. Capture any employer retirement match first — that beats both.