Your credit card gives you at least 21 days to pay for purchases with no interest. There's one condition: you must pay the full statement balance by the due date.
Pay even a little less, and the interest-free window closes. At many banks, interest is then charged all the way back to the day you bought each item. Here's how the 21-day rule really works, and how to never pay credit card interest.
Interest: the price you pay for borrowing money, shown as a yearly percentage.
Statement balance: the total you owe on the day your monthly statement is made.
How the 21-day grace period works
Federally regulated banks must give you a grace period of at least 21 days, according to the Financial Consumer Agency of Canada (FCAC). It starts on the last day of your billing period, the date your statement is made.
The FCAC gives this example: you buy a smartphone on January 15. Your January statement arrives on February 1. You have until February 21 to pay off the phone and your other purchases without paying any interest.
Grace period: the interest-free time between your statement date and your due date.
Billing period: the roughly one-month stretch of purchases that one statement covers.
Federally regulated: overseen by the Government of Canada. The 21-day minimum applies to these institutions. If you're not sure whether yours is one, ask it.
Pay less than the full balance, and interest reaches back
If you don't pay your full balance by the due date, you pay interest, and you keep paying it until the balance is paid in full (FCAC).
Some major banks also charge that interest back to the day you made each purchase, not just from the due date. Two examples from major banks:
- CIBC's cardholder agreement (effective August 1, 2026): interest "will be charged retroactively on each Purchase from the Transaction date until we receive a payment which covers the Purchase" (CIBC).
- RBC explains that interest "would kick in from the date of the transaction" (RBC).
What that costs: RBC gives this example. An average daily balance of $1,000 at 19.99% interest over a 30-day billing cycle costs $16.43 in interest. That amount is added to your balance on the next statement.
The rules differ from bank to bank. Check your own cardholder agreement to see exactly how your card works.
Retroactively: backdated. The interest is counted from an earlier date, the day you bought the item.
Transaction date: the day you made the purchase.
Average daily balance: what you owed on average each day during the billing period.
Cardholder agreement: the contract between you and your card company.
Cash advances and balance transfers: no grace period at all
The 21-day grace period covers purchases only. According to the FCAC, it doesn't apply to:
- Cash advances. Interest starts the day you take the cash and runs until you pay it back in full.
- Cash-like transactions.
- Balance transfers.
CIBC's cardholder agreement says the same: "Interest is always charged on Cash Advances, Balance Transfers and Convenience Cheques" (CIBC).
Cash advance: taking out cash with your credit card, for example at an ATM.
Balance transfer: moving debt from one card or loan onto your credit card.
Convenience cheque: a cheque your card company sends you. Using it borrows money from your credit card.
What credit card interest costs in Canada
Once the grace period is gone, these are the rates you pay. Typical ranges, according to creditcardGenius:
| Type of transaction | Typical yearly interest rate | Grace period? |
|---|---|---|
| Purchases | 19.99% to 21.99% (most cards) | Yes, if you pay in full |
| Cash advances | 22.99% to 27.99% | No |
| Balance transfers | 0% to 17.99% (often a promotional rate for 6 to 12 months) | No |
There is a legal ceiling. Since January 1, 2025, it's a criminal offence in Canada to lend at more than 35% APR. The limit used to be about 48% APR (Bennett Jones).
APR (annual percentage rate): the yearly cost of borrowing, shown as a percentage.
Promotional rate: a low rate a card company offers for a limited time, often to new customers. It rises to the regular rate when the offer ends.
Criminal interest rate: the rate above which lending money is a crime under Canada's Criminal Code.
Lost your grace period? Here's how to get it back
Pay your full statement balance by the due date. According to Wealthsimple, you may need to do this for one to two billing cycles in a row before new purchases are interest-free again.
Until then, interest starts on new purchases right away, with no 21-day window.
The exact rule depends on your card. Ask your card company: "How many full payments do I need to make before my grace period comes back?"
Billing cycle: one statement period, usually about a month.
6 habits to never pay credit card interest
- Pay the statement balance, not the minimum. Only the full statement balance keeps your grace period.
- Know your two dates. Find your statement date and due date on your statement. The grace period runs between them.
- Set up automatic payment of the full balance. It's the simplest way to never miss the due date.
- Pay a few days early. Payments are processed on business days (Monday to Friday). A due date on a weekend or holiday moves to the next business day (FCAC).
- Never use your card for cash. Cash advances charge interest from day one.
- Only spend what you can pay off by the due date. A credit card works best as a payment tool, not a loan.
Statement date: the day your card company makes your monthly statement. Purchases after it go on the next one.
Due date: the last day to pay without being late.
This article is for general information only and isn't financial advice.