Best credit card to use at Costco
Costco is one of the most commonly misoptimized merchants in a typical wallet.
Here's why: Costco only accepts Visa cards in-warehouse. That constraint eliminates a lot of popular reward cards outright. But within the Visa universe, the spread between your best and worst option is enormous — you could be earning 1x or you could be earning 4–5x. Most people are somewhere in the middle without realizing it.
This guide covers the strongest options by card type and situation, so you can figure out exactly what to reach for next time you're at the register.
The baseline: What you're probably getting now
If you're using a generic Visa cash back card at Costco, you're likely earning somewhere between 1–1.5% on everything. That's the floor. The ceiling, depending on your cards, is 3–5x — a gap that adds up fast if you're a regular Costco shopper.
The best cards for Costco in-warehouse purchases
Costco Anywhere Visa® by Citi — 2% on all Costco purchases
The obvious starting point is the co-branded card. 2% on all Costco in-warehouse and Costco.com purchases. No annual fee if you have a paid Costco membership. Solid, but not actually the highest earner at Costco — it's just the most convenient option for people who don't want to think about it.
Best for: Heavy Costco shoppers who want simplicity and a second card specifically for warehouse use.
Limitation: You're leaving upside on the table if you have better options already.
Citi Custom Cash® Card — 5% on your top spend category
The Citi Custom Cash is one of the most underrated cards for category optimization. It earns 5% cash back on your top eligible spend category each billing cycle, up to $500 spent. Eligible categories include wholesale clubs — which is exactly how Costco is classified.
If Costco is already your largest spend category in a given month, this earns you 5x automatically. No registration, no activation.
Best for: Anyone who spends heavily at Costco and wants to maximize a no-annual-fee card.
Limitation: The 5% is capped at $500 in purchases per cycle. If you regularly spend more than that at Costco, you'd earn 1% on everything over the cap.
Visa cards that earn well in the "warehouse clubs" category
Several Visa-network cards with flat or tiered rewards treat Costco purchases as a premium category:
- Capital One Savor / SavorOne — The Savor earns 3% on grocery store purchases, and Costco often codes as grocery with Capital One. Worth checking your statement history to see how it's categorized for you.
- Chase Freedom Flex / Freedom Unlimited — These are Visa, and the Freedom Flex includes rotating 5% categories that occasionally include warehouse clubs. When that quarter activates, it's worth prioritizing.
- Bank of America Customized Cash Rewards — Lets you choose your 3% category. "Online shopping" can include Costco.com purchases. In-warehouse purchases may not qualify, but it's worth testing.
What about the Amex Gold or Chase Sapphire?
Not accepted at Costco in-warehouse. Both are Amex and Mastercard/Visa respectively — but the Amex Gold is off the table entirely, and the Sapphire Preferred/Reserve (Visa) doesn't have specific Costco category bonuses. You'd earn 1x on most Costco purchases with the Sapphire.
What about Costco.com?
Online purchases at Costco.com are a different story — you're not restricted to Visa. Cards like the Amex Blue Cash Preferred (6% at U.S. supermarkets, though Costco.com may code as online retail rather than grocery) or a flat 2% card like the Wells Fargo Active Cash may apply here. Your best cashback or shopping portal card is worth checking.
How cashew handles this
When you add your cards to cashew and shop at Costco, the app maps the merchant to its spend category (wholesale clubs / warehouse) and surfaces your highest-earning Visa option. If you don't have a card that outperforms the Costco Anywhere Visa, it'll tell you — and if there's a gap worth filling, it surfaces the best recommendation for your wallet specifically.
Quick reference
| Card | Rate at Costco | Annual fee | Cap |
|---|---|---|---|
| Citi Custom Cash | 5% | $0 | $500/cycle |
| Costco Anywhere Visa | 2% | $0 (w/ membership) | None |
| Chase Freedom Flex (rotating) | 5% (when active) | $0 | $1,500/quarter |
| Generic Visa (1x) | 1% | Varies | — |
The bottom line: Costco's Visa-only policy is the constraint, but it's not a dealbreaker. The Citi Custom Cash is hard to beat for moderate Costco spending, and the Freedom Flex is worth activating when the category rotates. If you're spending significantly more than $500/month at Costco, the Costco Anywhere Visa starts to make more sense as a dedicated card for the warehouse.