Why your grocery card earns nothing at Costco
Why doesn't my 6% U.S. supermarket card earn its usual bonus when I shop at a wholesale club like Costco?
Scenario
Wallet: Blue Cash Preferred (6% at U.S. supermarkets, 1% elsewhere), Citi Double Cash (2% catch-all).
Costco codes as a wholesale club, not a supermarket.
MerchantCostco Wholesale
Purchase categoryWholesale clubs
Amount$250.00
Card options
| Card | Earns | Cash-equivalent |
|---|---|---|
| Citi Double CashBest card | 2% · Cash back | $5.00 |
| Blue Cash Preferred | 1% (no supermarket bonus) · Cash back | $2.50 |
Result
Swipe Citi Double Cash. The 6% grocery bonus doesn't apply at a wholesale club, so the flat 2% card actually earns more. The store's category, not the product, decides the bonus.
Illustrative scenario with sample wallets and values. Reward rates and point valuations are estimates that change over time. Pikt is in beta — you always pay with your own card. Pikt is not a bank and does not hold or move your money. See the methodology.