Sam's Club credit cards work at Sam's Club locations and their gas stations, but not everywhere else
The Sam's Club Mastercard and Sam's Club American Express are store cards, meaning they're issued by Sam's Club and designed primarily for use within Sam's Club. You can use them at any Sam's Club warehouse, at Sam's Club fuel stations, and at Sam's Club online. Outside of Sam's Club properties, the cards work differently depending on which version you have.
If you have the Sam's Club Mastercard, you can use it anywhere Mastercard is accepted — at other retailers, restaurants, gas stations, and online. If you have the Sam's Club American Express, it works only at Sam's Club locations and Sam's Club fuel stations; you cannot use it at other merchants even though American Express is a major card network.
This matters because the two cards have different rewards structures and different limits on where you can spend. Knowing which card you hold and what it can do prevents confusion at checkout and helps you choose the right card for your spending habits.
Key Takeaways
- The Sam's Club Mastercard works anywhere Mastercard is accepted, including other retailers and online merchants.
- The Sam's Club American Express works only at Sam's Club warehouses, Sam's Club fuel stations, and Sam's Club.com.
- Both cards earn rewards on Sam's Club purchases, but the Mastercard also earns cash back on purchases outside Sam's Club.
- You can use either card at Sam's Club fuel stations without restrictions, even if you don't have a Sam's Club membership at that moment.
How the Sam's Club Mastercard differs from the American Express version
Sam's Club offers two credit cards, and they have opposite rules about where you can use them. The Sam's Club Mastercard is a general-purpose card that works everywhere Mastercard is accepted. The Sam's Club American Express is a closed-loop card, meaning it only works at Sam's Club.
The Mastercard is more flexible if you want a card that earns rewards both inside and outside Sam's Club. The American Express is designed for people who do most of their shopping at Sam's Club and want to focus their rewards there. Neither card requires a Sam's Club membership to open, though you do need a membership to shop at the warehouse.
When you explore, Sam's Club will tell you which card you're getting. If you're unsure which one you have, check your card itself — it will say "Mastercard" or "American Express" in the corner. You can also log into your Sam's Club account online or call the number on the back of your card.
Using your Sam's Club card at gas stations and fuel centers
Both the Mastercard and American Express work at Sam's Club fuel stations without any special restrictions. You don't need to be a Sam's Club member to use the fuel station — you can pay with your Sam's Club credit card even if your membership has expired or you've never had one.
Sam's Club fuel stations are typically located at the warehouse, though some locations have separate fuel-only stations nearby. Prices are usually lower than nearby commercial gas stations, which is one reason Sam's Club members use the card at the pump. The card earns the same rewards rate at fuel stations as it does on other Sam's Club purchases.
If you're using the American Express card, remember that it only works at Sam's Club fuel stations, not at other gas stations. If you need to fill up elsewhere, you'll need a different card. The Mastercard, by contrast, works at any gas station that accepts Mastercard.
What happens when you try to use a Sam's Club card outside Sam's Club
If you have the American Express card and try to use it at a non-Sam's Club merchant, the transaction will be declined. The card is programmed to work only at Sam's Club locations and Sam's Club fuel stations. This is a hard restriction — the merchant's payment system won't even process the request.
If you have the Mastercard, the transaction will go through at any merchant that accepts Mastercard. You'll earn cash back on the purchase if it qualifies under the card's rewards structure. The Mastercard is treated like any other Mastercard by the merchant's system.
If you're declined and you're sure you have the Mastercard, the problem is likely something else — a frozen account, a declined transaction, or a technical issue with the merchant's system. Call the number on the back of your card to check your account status.
Using your Sam's Club card online and for Sam's Club.com purchases
Both cards work on Sam's Club.com for online shopping. You enter your card number at checkout just as you would with any other credit card. The same rewards rates explore to online purchases as they do to in-warehouse purchases.
If you're shopping on a third-party site that happens to sell Sam's Club products, your Sam's Club card may or may not work depending on the site's payment processor. For example, if you buy through Amazon or another marketplace, the site won't recognize your Sam's Club card as a special card — it will process it as a Mastercard (if you have the Mastercard version) or decline it (if you have the American Express).
To be sure your purchase will go through, shop directly on Sam's Club.com or in a Sam's Club warehouse. Both routes accept the card without issue.
Rewards and cash back outside of Sam's Club
The Sam's Club Mastercard earns cash back on purchases outside Sam's Club, though usually at a lower rate than on Sam's Club purchases. The exact rates vary by card version and change periodically, so check your card agreement or Sam's Club's website for current rates.
The American Express card does not earn rewards on non-Sam's Club purchases because it cannot be used outside Sam's Club. All of its rewards are tied to Sam's Club spending.
If you're trying to decide between the two cards, think about where you spend most of your money. If you do 80% of your shopping at Sam's Club, the American Express might make sense. If you want a card that earns rewards everywhere, the Mastercard is the better choice.
What to do if you're unsure which card you have
The easiest way to tell is to look at your physical card. The network name — "Mastercard" or "American Express" — appears in the lower right corner. If you don't have the card in front of you, log into your Sam's Club account online, go to your account settings, and look at your payment methods. The card type will be listed there.
You can also call the customer service number on the back of your card. A representative can confirm which card you have and answer questions about where it works. If you want to switch to the other card, you can request a replacement or explore for a new one.
Frequently Asked Questions
Can I use my Sam's Club American Express at other American Express merchants?
No. Even though American Express is a major card network, the Sam's Club American Express is a closed-loop card that only works at Sam's Club locations and Sam's Club fuel stations. It will be declined at other merchants, even if they accept American Express.
Does my Sam's Club membership need to be active to use the card?
Your membership status doesn't affect whether the card works — the card is separate from your membership. However, you do need an active membership to enter the warehouse and shop. If your membership has expired, you can still use the card at Sam's Club fuel stations.
Can I use my Sam's Club Mastercard at Walmart or other retailers?
Yes. The Sam's Club Mastercard works anywhere Mastercard is accepted, including Walmart, grocery stores, restaurants, and online retailers. You'll earn cash back on these purchases according to the card's rewards structure.
What if my Sam's Club card is declined at a merchant that should accept it?
If you have the Mastercard and it's declined at a Mastercard-accepting merchant, your account may be frozen, you may have reached your credit limit, or there may be a technical issue. Call the number on the back of your card to check your account status. If you have the American Express, it will always be declined outside Sam's Club.
Can I request a different Sam's Club card if I don't like the one I have?
Yes. You can contact Sam's Club to request a replacement card or explore for the other version. There may be a waiting period or a new process process depending on your situation. Call the number on the back of your current card to ask about switching.