How does credit card interest work in Canada? Rates, grace period and what you really pay

Most people know a credit card charges interest, but not when it starts, which balance it applies to, or why paying the minimum feels like it never makes a dent. This guide explains the pieces in order: the rates, the grace period, how your payments are applied, and what FCAC's own minimum-payment example shows. We also run an illustrative daily-interest calculation so you can see the order of magnitude on your own balance.

The rates on a credit card

FCAC says rates vary by financial institution and by type of transaction. Its example is 19% on regular purchases and 22% on cash advances and cash-like transactions. Rates on specialized and retail cards may be higher. Balance transfers often carry a promotional rate for a set period, and the transfer fee is usually a percentage of the amount: FCAC's example is a $1,000 transfer with a 3% fee, which costs $30.

Your own rates are in your cardholder agreement and on each statement. These are examples, not what your card charges.

When interest starts: the grace period

FCAC says you pay interest if you do not pay your balance in full by the due date, and interest continues until the balance is paid in full. The grace period is the interest-free window for the previous month's purchases. It begins on the last day of your billing period, and federally regulated financial institutions must provide a minimum 21-day grace period. In FCAC's example, January purchases on a February 1 statement can be paid by February 21 without interest.

Two details trip people up. First, the grace period does not apply to cash advances, cash-like transactions or balance transfers; interest on those runs from the transaction date. Second, once you carry a balance past the due date you generally lose the interest-free window on new purchases too until you pay in full. We cover this in detail in the grace period guide and, for the cash side, our guide to the cash advance fee.

What interest looks like in dollars (illustrative)

FCAC does not publish a single calculation method, and issuers differ, so treat this as an order-of-magnitude check. A common way to estimate is to divide the annual rate by 365 and apply it to the balance each day. These are our numbers, not a quote.

If you only pay the minimum, that interest is roughly what the minimum has to cover before a dollar reduces the balance. Use the calculators to try your own balance and rate.

The minimum payment and why it barely helps

FCAC says the minimum payment is usually either a flat amount (typically $10) plus interest and fees, or the higher of $10 or about 3% of the outstanding balance. Your credit agreement says which. For Quebec residents the minimum payment has been 5% since August 1, 2025. Federally regulated issuers must show on statements how long it would take to pay off the balance by paying only the minimum.

FCAC's worked example uses a $2,000 balance at 18% interest:

FCAC notes that an extra $100 a month cuts the payoff time by about 2.7 years and the interest by $562. Our minimum payment trap guide has a calculator for your own numbers.

How your payments are applied

When you carry more than one kind of balance, the order matters. FCAC says your minimum payment typically applies first to the lowest-interest portion of the balance. Anything above the minimum goes either to the highest-interest portion or proportionally across the whole balance, and federally regulated issuers can decide which method they use. FCAC also says issuers may choose how they apply your payments, so read your agreement.

The practical effect: a cash advance at a higher rate can sit on the account while your payments chip away at cheaper purchase balances. If you carry a mix, ask your issuer which method it uses.

What a late or missed payment does

• Your rate may rise. FCAC says if you do not make the required minimum payment by the due date your interest rate may increase, temporarily or permanently, and federally regulated institutions must notify you before it takes effect.
• You can lose a promotional rate. FCAC lists this, along with a possible credit score drop and card cancellation, as a consequence of late or missed payments.
• A payment holiday is not free. If an issuer lets you skip a payment, interest still accrues, and federally regulated issuers must say so clearly when the offer is made.

A late payment can also affect your credit; see credit utilization and why your score may drop.

Reading the interest line on your statement

Your statement is where the theory meets your card. Look for four things each month. The statement balance is what to pay in full to stay inside the grace period. The minimum payment due is the smallest amount that keeps the account in good standing, not the amount that stops interest. The payment due date is the deadline for both. And the interest charges section usually splits the amount by type of balance, so you can see whether purchases, cash advances or a balance transfer are costing you.

FCAC says federally regulated issuers must show how long it would take to pay off the balance with minimum payments only. That number is worth reading once a quarter. If it shows many years, the card is behaving as a loan, and the best response is a payoff plan rather than hoping the balance shrinks.

Two other places show the cost. Your cardholder agreement lists every rate and fee in one table, and it is worth asking your issuer about anything you do not understand. And a statement scan can pull recurring interest and fee lines out of several months at once, which makes it easier to see the pattern than reading each PDF in turn.

A simple monthly routine (illustrative)

Here is a routine many people use to keep interest near zero. It is general information, not a personal plan.

1. Put the due date in your calendar a few days early, so a weekend or holiday never makes you late. FCAC notes issuers process payments on business days, and if a due date falls on a weekend or holiday you can pay the next business day and still be on time.
2. Pay the full statement balance if you can. If you cannot, pay as much above the minimum as possible and stop adding new purchases to that card until it is cleared.
3. Keep cash advances out of the routine. If you must take one, repay it first because it starts costing interest on day one.
4. Review the interest line each month. If it is not zero, find out which balance it came from.
5. If a balance keeps growing, compare a payoff order using the avalanche or snowball method and set a firm monthly amount.

On a $2,000 balance at the 19% example rate, every month you carry the full balance costs about $31 by our estimate, or roughly $375 over twelve months if the balance never moved. That figure is our arithmetic and ignores the minimum payments you would make, which reduce it, so it is only a rough scale.

Ways to pay less interest

• Pay the statement balance in full by the due date. That keeps purchases inside the grace period.
• Pay more than the minimum. FCAC's example shows the gap: $793 of interest versus $231.
• Target the expensive balance first. Our snowball vs avalanche guide compares the two common orders, and the pay off credit card debt guide turns them into a plan.
• Avoid cash advances. No grace period and a higher example rate make them the costliest way to use a card.
• Compare cards. FCAC runs a credit card comparison tool, and rates, fees and grace periods differ by issuer.

Sources

Financial Consumer Agency of Canada (FCAC), How credit cards work (updated October 15, 2025: interest, example rates of 19% and 22%, the 21-day grace period, cash advances, balance transfers, rate increases and payment application) and Pay off your credit card (updated October 15, 2025: minimum payment methods, Quebec 5% since August 1, 2025, the $2,000 at 18% worked example, payment holidays, consequences of late payment). The daily-interest figure is illustrative and the arithmetic is ours.

Rate jumped after a late payment? Read can my bank raise my interest rate after a missed payment, with a cost calculator.