An accelerated bi-weekly mortgage payment is your regular monthly payment cut in half and withdrawn every two weeks. A year holds 26 two-week periods rather than 24, so you end up making the equivalent of 13 monthly payments instead of 12, and that extra payment goes entirely against your principal.
The word accelerated is doing all the work in that phrase. A plain bi-weekly payment is built differently. Your lender takes the monthly payment, multiplies it by 12, then divides the result by 26. You still pay 26 times a year, but the annual total matches a monthly schedule exactly. Nothing gets paid off any faster. The two options sit beside each other on the same lender form and read almost identically, which is how people choose one believing they picked the other.
Numbers make it obvious. Say your monthly payment is $3,000. Accelerated bi-weekly means $1,500 every two weeks, or $39,000 across the year. Regular bi-weekly works out to about $1,385 every two weeks, totalling $36,000, the same as twelve monthly payments. That $3,000 gap is the extra payment, and all of it reduces the balance you are charged interest on.
What the extra payment is worth
The reduction lands early and then compounds, so a modest annual difference becomes a large one. Lender and industry calculators generally show an accelerated bi-weekly schedule trimming three to four years off a 25-year amortization and saving tens of thousands in interest, depending on your rate and balance. On a Toronto mortgage, where a $700,000 balance is ordinary, the interest avoided usually exceeds the extra amount you put in. The higher your rate, the wider that gap gets.
Canadian lenders typically offer five frequencies: monthly, weekly, bi-weekly, accelerated weekly and accelerated bi-weekly. You pick one when the mortgage funds, and most lenders will let you change it later, sometimes free and sometimes for a small administrative fee. A mortgage renewal is the simplest moment to switch, since the terms are being reset anyway. Accelerated is rarely the default on the paperwork, so nobody sets it up for you.
One caution before switching. The higher amount is a required payment, not an optional prepayment you can skip in a thin month, so your budget has to carry it every cycle. It usually does not eat into the lump sum or payment increase privileges written into your contract, though those limits are worth reading, and they differ between open and closed mortgages.
Related reading: What Is Mortgage Amortization and How Does It Work in Canada?, How Mortgage Prepayment Penalties Work in Canada, and Fixed vs Variable Mortgage in Canada: Which Is Better?.
