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Credit Cards

Credit Card Interest Guide

What Is Credit Card Interest?

Credit card interest is the cost of borrowing money when you don’t pay off your full balance by the due date. It’s typically expressed as an Annual Percentage Rate (APR) and can vary by card type, issuer, or transaction.

When You’re Charged Interest

You’re only charged interest when you carry a balance from one month to the next. If you pay your full statement balance by the due date, you won’t owe any interest, thanks to the grace period.

But if you don’t pay the full amount:

  • Interest is charged on the remaining balance,

  • And may be backdated to the date of each purchase.

How Credit Card Interest Is Calculated

Most credit cards use daily compounding interest. That means interest is calculated and added to your balance every day you carry a balance.

Here’s the math in action:

  1. Daily Rate = APR ÷ 365
    (e.g., 19.99% ÷ 365 = 0.0548% daily)

  2. Interest Charged = Daily Rate × Balance × Number of Days

Even a few days of carrying a balance can add up quickly.

Different Types of Credit Card Interest Rates

Purchase APR: Standard rate for regular spending.

Cash Advance APR: Higher rate (often 21–24%) with no grace period — interest starts immediately.

Balance Transfer APR: Can be lower, especially during promotional periods.

Penalty APR: A higher rate (sometimes 29.99%+) if you miss payments

How to Avoid Paying Credit Card Interest

  • Pay your statement balance in full every month

  • Avoid cash advances — they’re interest traps

  • Use 0% intro offers wisely — and mark when they expire

  • Set up alerts or auto-pay to never miss a due date

Key Takeaways

  • Credit card interest is avoidable if you pay your full balance on time.

  • Most cards charge interest daily — so even a short delay can cost you.

  • Cash advances and missed payments can trigger immediate or higher interest rates.

Common Questions

Q: What’s a typical interest rate on Canadian credit cards?
A: Most charge between 19% and 22% APR for purchases. Cash advances and missed payments can trigger higher rates.

Q: Can I negotiate a lower interest rate?
A: Sometimes. If you have a strong history with your bank, they may offer a reduced APR — especially if you ask.

Q: Do all purchases have a grace period?
A: Only if your previous balance was paid in full. If you’re already carrying a balance, new purchases start accruing interest right away.

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