How Credit Card Interest Is Calculated in Canada (Worse Than You Think)
By Jordan Ellis · Published · Reviewed
Quick Answer
Canadian credit cards charge interest daily: 19.99% ÷ 365 = 0.0548% per day on your average daily balance — about $50/month on a $3,000 balance. Pay your statement in full and purchases are interest-free (the grace period); carry even $1 and new purchases start accruing interest immediately, and cash advances never get a grace period at all.
Your statement says 19.99%. What it doesn’t say is when that 19.99% applies — and the when is where the money is.
The daily math
Divide the annual rate by 365. At 19.99%, that’s 0.0548% per day, applied to each day’s balance and totalled on your statement:
- $1,000 balance → ~$0.55/day → ~$16.65/month
- $3,000 balance → ~$1.64/day → ~$50/month
- $8,000 balance → ~$4.38/day → ~$133/month
Unpaid interest gets added to the balance, so next month you pay interest on interest. See exactly how long your balance takes to die at different payment levels with the credit card payoff calculator.
The grace period — and how you lose it
Pay your statement balance in full by the due date and purchases are effectively a free 21–30 day loan. That’s the grace period, and it’s the best deal in consumer credit.
Carry any balance — even $1 — and it evaporates. New purchases start accruing interest from the transaction date, not the statement date. This is the mechanism behind the minimum payment trap: people paying “something every month” are often paying interest on every new purchase too.
Cash advances: the expensive corner
Cash advances (including ATM withdrawals, convenience cheques, and often e-transfers from the card) stack three costs:
- A higher rate — typically 22.99–24.99%
- An upfront fee — flat $3.50–$5 or 1–3%
- No grace period — interest from second one
A $500 advance held 30 days at 22.99% costs about $9.45 of interest plus the fee: roughly $13–$15 in total. If you need short-term cash, almost anything — a personal loan, a line of credit, an overdraft — beats it.
Timing tricks that cost nothing
- Pay before the statement closes, not just before the due date. Lower statement balances mean lower credit utilization reported to the bureaus.
- Split the payment. Two half-payments mid-cycle cut the average daily balance more than one payment on the due date.
- Move the balance if you can’t kill it. A 0% balance transfer with a 1–3% fee beats 19.99% if you can pay it down inside the promo window — model it on the payoff calculator first.
The rate on the card is fixed. The amount of interest you actually pay is almost entirely under your control.
Official sources
Rules and dollar limits change. Confirm current amounts with the official pages below before you act · Last reviewed .
- Credit cards (Financial Consumer Agency of Canada)