Sam's Club credit cards only work at Sam's Club locations and their partner websites
The Sam's Club Mastercard and Sam's Club Business Mastercard are closed-loop cards, which means they can be used only at Sam's Club warehouse locations, on Samsclub.com, and at Sam's Club Gas stations. You cannot use them at other retailers, restaurants, or anywhere else that accepts Mastercard.
This is different from a regular Mastercard, which works almost anywhere. Sam's Club designed their card this way to keep rewards and benefits tied to their membership ecosystem. If you need a card that works everywhere, you would need a different card — either a general-purpose credit card or Sam's Club's Mastercard option, which does work outside Sam's Club.
The restriction applies whether you're shopping in person, ordering online, or paying at the pump. There is no workaround to use the card outside these locations.
Key Takeaways
- Sam's Club credit cards work only at Sam's Club warehouses, Samsclub.com, and Sam's Club Gas stations — not at other stores or online retailers.
- These are closed-loop cards by design, meaning they function like store cards rather than general-purpose credit cards.
- If you need a card that works everywhere, you should look for a different credit card or a Sam's Club Mastercard that is not restricted to Sam's Club.
- The restriction applies to all purchase types: in-warehouse, online, and at gas pumps.
Why Sam's Club uses a closed-loop card instead of an open-loop card
Sam's Club restricts their card to their own locations because it strengthens their business model. When cardholders can only use the card at Sam's Club, the company knows exactly where spending happens and can build rewards around that spending. This also encourages members to shop more frequently at Sam's Club rather than splitting purchases across multiple retailers.
A closed-loop card also costs Sam's Club less to operate. They don't pay Mastercard interchange fees on every transaction the way an open-loop card issuer does. Those savings let them offer higher rewards rates (typically 2% back on most purchases) without losing money on the card program.
From a member's perspective, this means the rewards are generous within Sam's Club but worthless outside it. That trade-off makes sense if you do most of your shopping at Sam's Club already. If you shop there only occasionally, the card may not be worth carrying.
What happens if you try to use the card outside Sam's Club
If you attempt to use your Sam's Club credit card at a retailer that is not Sam's Club, the transaction will be declined. The card's restrictions are built into the payment system itself, so the decline happens automatically at the point of sale — whether you're at a grocery store, gas station, restaurant, or any other merchant.
You will not be charged a fee for the declined transaction. The merchant's system will simply reject the card and ask you to provide a different payment method. There is no penalty or mark on your account.
This is why it's important to carry a second credit card or debit card if you use the Sam's Club card. Having a backup payment method prevents the awkward moment of a declined card at checkout.
The difference between Sam's Club's closed-loop card and their Mastercard
Sam's Club actually offers two different credit cards, and they work very differently. The Sam's Club Mastercard (sometimes called the Sam's Club World Mastercard) is an open-loop card that works anywhere Mastercard is accepted — at any store, restaurant, gas station, or online retailer in the world. The Sam's Club credit card (the closed-loop version) works only at Sam's Club.
The rewards structure differs too. The closed-loop card typically offers higher rewards rates at Sam's Club (2% back on most purchases, higher on gas and food) but zero rewards outside Sam's Club because you cannot use it outside. The Mastercard offers lower rewards rates overall (usually 1% to 2% depending on the category) but those rewards work everywhere you shop.
Which card makes sense depends on your shopping habits. If you do the majority of your shopping at Sam's Club and rarely need a card elsewhere, the closed-loop card's higher rewards rate is a better deal. If you want one card that works for all your purchases, the Mastercard is the right choice, even though the rewards rate is lower.
How to use your Sam's Club card online and at the gas pump
On Samsclub.com, enter your Sam's Club credit card information at checkout just as you would any other card. The website recognizes the card and processes the payment. You do not need to do anything special — the card works the same way as any other payment method on the site.
At Sam's Club Gas stations, you can pay at the pump by inserting your card into the reader or tapping it if your card has contactless payment enabled. You can also pay inside the station. The card works at all Sam's Club Gas locations, which are typically located at or near Sam's Club warehouses.
If you're shopping at a Sam's Club warehouse, you can use the card at any checkout lane. Some locations also have self-checkout, where the card works the same way. There are no restrictions based on purchase type or location within the Sam's Club ecosystem.
What to do if you need a card that works everywhere
If you find that the Sam's Club closed-loop card is too limiting, you have several options. You can apply for Sam's Club's Mastercard instead, which works at any merchant that accepts Mastercard. You can also carry a second credit card from another issuer — a bank, another retailer, or a general-purpose card company.
Many people carry both: the Sam's Club card for warehouse shopping (to earn the higher rewards rate) and a Mastercard or Visa for everything else. This approach lets you maximize rewards at Sam's Club while maintaining payment flexibility elsewhere.
If you already have the closed-loop Sam's Club card and want to switch to the Mastercard version, contact Sam's Club customer service. You can request a product change, which usually takes a few business days. You will keep the same account and credit line but get a new card with different restrictions and rewards.
Frequently Asked Questions
Can I use my Sam's Club card at Walmart or other stores?
No. Your Sam's Club credit card works only at Sam's Club locations, Samsclub.com, and Sam's Club Gas stations. It will not work at Walmart, Target, grocery stores, or any other retailer. If you need a card that works at multiple stores, you need a different credit card.
Does the Sam's Club Mastercard work everywhere?
Yes. The Sam's Club Mastercard is an open-loop card that works anywhere Mastercard is accepted worldwide. It works at restaurants, gas stations, online retailers, and any other merchant. This is different from the closed-loop Sam's Club credit card, which works only at Sam's Club.
What if I accidentally try to use my Sam's Club card outside Sam's Club?
The transaction will be declined automatically. You will not be charged a fee or penalty. Simply provide a different payment method. There is no mark on your account or credit report from a declined transaction.
Can I use my Sam's Club card internationally?
Only if you're at a Sam's Club location outside the United States. Sam's Club has warehouses in Canada and Mexico, and your card will work there. For any other international merchant, the card will be declined.
If I switch to the Sam's Club Mastercard, will my rewards transfer?
Rewards you have already earned stay in your account and do not disappear when you switch cards. However, the rewards rate changes based on which card you use going forward. Purchases on the Mastercard earn at the Mastercard rate, not the higher closed-loop card rate.