Costco card guide
Which credit card should I use at Costco?
Compare Costco warehouse, Costco gas, and Costco.com purchases with correct card-network acceptance, reward caps, and payout timing.
Last reviewed September 1, 2026 · Issuer terms can change · How rankings work
The short answer
Treat Costco as three decisions. U.S. warehouses and Costco gas accept Visa credit cards; Costco.com accepts Visa and Mastercard. AAA Daily Advantage can earn 3% on eligible wholesale-club purchases while its shared cash-back cap remains, while Costco Anywhere Visa earns 5% at Costco gas before its combined gas-and-EV cap and 2% on ordinary Costco and Costco.com purchases.
Compare the cards I haveRun the exact purchase
What to use—and when
Strong warehouse rate
AAA Daily Advantage
Earns 3% on eligible wholesale-club purchases. AAA marketing describes a $10,000 purchase limit while current Comenity terms describe a $500 combined cash-back cap; verify the cap that applies to your account.
Strong Costco gas rate
Costco Anywhere Visa
Earns 5% at Costco gas before the combined $7,000 annual gas-and-EV purchase cap, then earns 1%.
Simple fallback
Eligible flat-rate card
A 2% Visa can match Costco Visa on ordinary warehouse purchases; Costco.com also permits Mastercard.
Decision rules
- Choose warehouse, gas, or Costco.com before comparing cards.
- At U.S. warehouses and Costco gas, exclude non-Visa credit cards; online, include Mastercard.
- Check shared or category-specific annual caps before trusting the headline rate, especially where issuer materials describe the AAA cap differently.
Common traps
- Costco warehouse purchases do not automatically count as ordinary groceries.
- The Costco Visa gas rate is capped, and ordinary Costco purchases earn a lower rate.
- Costco Visa cash back is issued as an annual reward certificate, not monthly cash back.
$250 warehouse example
At 3%, AAA Daily Advantage produces $7.50 before its shared cash-back cap. A 2% Costco Visa or flat-rate Visa produces $5. Confirm that the merchant and cap conditions match your purchase.
Questions people actually ask
Can I use Mastercard at Costco?
Costco says U.S. warehouses and gas stations accept Visa credit cards, while Costco.com accepts both Visa and Mastercard.
Is the Costco Visa always best at Costco?
No. Its rate varies by purchase type and cap status. Other eligible Visa cards can earn more on warehouse purchases, while online purchases can also use Mastercard.
Primary sources
SwipeCue is independent and does not use affiliate links on this page. Verify material purchases against current issuer terms. See the methodology or report a correction.
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