CIBC Costco Mastercard interest rate and fees: what carrying a balance really costs

The CIBC Costco Mastercard interest rate is 21.75% on purchases and 22.49% on cash advances and balance transfers (21.99% in Quebec), from CIBC's rates and fees summary current as of August 1, 2026. That's a typical rate for a cash back card. Pay your full balance every month and it never matters; carry a balance and the interest outweighs the cash back within months. If you often carry one, compare a low-rate Mastercard on our best cards for Costco page.

What are the CIBC Costco Mastercard interest rates?

The same on the standard and World versions:

Cash advances have no interest-free period: interest starts the day you take one. Purchases are interest-free only if you pay the whole statement balance by the due date; otherwise interest is charged from each purchase's transaction date.

What fees does the CIBC Costco Mastercard charge?

Several fees don't apply to Quebec residents, and the paper statement fee is waived for clients aged 65 and older.

How much does carrying a balance cost?

Example only, simplified: a $1,000 balance kept on the card for a full year costs about $217.50 in interest at 21.75%. To earn that much back at the card's 1% warehouse rate, you'd have to spend $21,750 at Costco. Our cash back calculator shows a typical member earns about 1.4% to 1.7% overall, so even a small carried balance erases most of a year's cash back.

What is a lower-interest alternative that works at Costco?

It has to be a Mastercard, because Canadian Costco warehouses don't take Visa or Amex. One example: the MBNA True Line Mastercard charges 12.99% on purchases with a $0 annual fee (24.99% on cash advances), per MBNA's page checked October 4, 2026. It earns no rewards. CIBC's own low-rate card, the CIBC Select, is a Visa with a $29 annual fee (first year rebated), so it won't work in Costco warehouses.

That's about $88 a year less per $1,000 carried. A common setup: use the Costco card for purchases you pay off and keep any balance on a low-rate card.

Can you pay off a big Costco purchase at a lower rate?

Yes, with CIBC Pace It. The CIBC Costco Mastercard offers special installment rates on eligible purchases at Costco in Canada and Costco.ca, with no installment fee: 5.99% for 6 months, 6.99% for 12 months or 7.99% for 24 months. On a $1,500 TV split over 12 months, our estimate is about $57 in interest at 6.99%, against about $183 if you carried it at 21.75% on the same schedule (example only; CIBC shows the exact cost when you set up a plan).

How do you avoid paying interest at all?

• Pay the full statement balance by the due date, at least 21 days after the statement date. Set up automatic full payments if you can.
• Don't use the card for cash advances: interest starts immediately, plus a $5 fee.
• Make at least the minimum payment on time: 2 misses in 12 months trigger the higher rates, and a missed payment near December 31 can cost you the year's cash back certificate.
• Use another card abroad: the 2.5% foreign currency fee is more than the cash back on most purchases.