The short answer
Accelerated biweekly means you pay half of your monthly payment every two weeks. There are 26 two-week periods in a year, so you make 26 half-payments, which adds up to 13 monthly payments instead of 12. That one extra monthly payment a year goes straight to principal, so the loan ends years earlier. The Financial Consumer Agency of Canada (FCAC) describes accelerated weekly and biweekly payments the same way: the equivalent of one extra monthly payment per year.
Regular (non-accelerated) biweekly is different. Your lender takes the monthly payment, multiplies it by 12 and divides by 26. You pay the same amount per year as monthly, just in smaller pieces, so the savings are small.
Worked example: $500,000 at 5% over 25 years
We ran a $500,000 mortgage at 5% with a 25-year amortization through the Payoff Lab calculator. It uses Canadian semi-annual compounding and assumes the rate never changes, which real mortgages rarely do over 25 years. Treat the results as a comparison, not a forecast.
| Frequency | Payment | Payments a year | Paid per year | Total interest | Paid off in |
|---|---|---|---|---|---|
| Monthly | $2,908.02 | 12 | $34,896.24 | $372,406.00 | 25 years |
| Semi-monthly | $1,452.52 | 24 | $34,860.48 | $371,512.00 | 25 years |
| Biweekly | $1,342.16 | 26 | $34,896.16 | $370,505.58 | 25 years |
| Accelerated biweekly | $1,454.01 | 26 | $37,804.26 | $311,972.64 | 21 years, 6 months |
| Weekly | $671.08 | 52 | $34,896.16 | $369,691.40 | 24 years, 11 months |
| Accelerated weekly | $727.01 | 52 | $37,804.52 | $311,281.46 | 21 years, 6 months |
The monthly payment is $2,908.02. The accelerated biweekly payment is half of that, $1,454.01, every two weeks. Over a year you pay about $2,908.02 more than on the monthly schedule. That extra money cuts the payoff time from 25 years to about 21 years, 6 months and saves roughly $60,433.36 in interest.
Plain biweekly and weekly barely move the needle. They finish a few weeks to a month early and save around $1,900 to $2,715, mostly because each payment reaches the balance a little sooner.
Why the accelerated option works
Each payment pays the interest owing first. Whatever is left lowers your balance. An accelerated schedule sends about one extra monthly payment a year to principal, and a smaller balance means less interest the next period. The effect compounds over many years, which is why a payment that feels only slightly larger can remove several years from the loan.
You could get almost the same result on a monthly schedule by adding one-twelfth of a payment each month ($242.34 in this example), as long as your prepayment privileges allow the increase. Accelerated biweekly simply builds that habit into the schedule.
Things to check before you switch
- What your lender calls “accelerated”. Confirm the payment is half of the monthly amount. FCAC once found that a bank had labelled renewal payments “accelerated” when they were not, so read the payment amount, not just the label.
- Pay-day timing. Biweekly payments line up well with biweekly paycheques. If you are paid twice a month, semi-monthly may be easier, but it does not accelerate anything on its own.
- When you can change it. Many lenders let you change frequency during the term; others make it easiest at renewal. Ask whether there is a fee.
- Your cash cushion. Accelerated payments raise your yearly outlay by about one monthly payment. Make sure your budget still has room for emergencies.
Frequently asked questions
Does accelerated biweekly really save money on a Canadian mortgage?
Yes. Accelerated biweekly pays half the monthly payment every two weeks, which adds up to about one extra monthly payment a year. On a $500,000 mortgage at 5% over 25 years, our estimate shows payoff in about 21 years, 6 months and roughly $60,433 less interest than monthly payments, if the rate never changes.
What is the difference between biweekly and accelerated biweekly?
Regular biweekly takes the monthly payment times 12 and divides it by 26, so you pay the same amount per year as monthly. Accelerated biweekly pays half the monthly payment every two weeks, so you pay about 13 monthly payments a year instead of 12.
Is accelerated weekly better than accelerated biweekly?
Only slightly. Accelerated weekly pays a quarter of the monthly payment every week. In our $500,000 example it saves about $691 more interest than accelerated biweekly over the whole loan, because each payment reaches the balance a little sooner.
Can I get the same result with monthly payments?
Close to it. Adding one-twelfth of your monthly payment to each monthly payment sends about the same extra amount to principal each year. Check that your prepayment privileges allow the higher payment first.
Try it with your numbers
Open the free calculator, enter the balance, rate and amortization from your own mortgage statement, then switch the payment frequency or add an extra monthly amount. It uses the same Canadian semi-annual compounding as the examples on this page.
Related guides
Sources
- FCAC: Choosing a mortgage that is right for you
- FCAC: Paying off your mortgage faster
- FCAC: Commissioner’s Decision #131 (payment frequency disclosure)
Checked October 8, 2026. Rules and rates change, so confirm with your lender or the official page before you act.