You can use your Sam's Club credit card almost anywhere Mastercard is accepted, both in-store and online — but you'll earn the most cash back when you shop at Sam's Club itself.
The Sam's Club Mastercard works like any other Mastercard outside of Sam's Club locations. That means gas stations, grocery stores, restaurants, online retailers, and thousands of other merchants will take it. The card is not locked to Sam's Club only.
The reason to think carefully about where you use it, though, is the cash back structure. You earn a higher percentage back at Sam's Club than you do everywhere else. Where you swipe matters for your wallet.
Key Takeaways
- Your Sam's Club Mastercard works at any merchant that accepts Mastercard, including online shopping, gas pumps, and restaurants.
- Cash back rates are highest at Sam's Club locations and Sam's Club gas stations, and lower for purchases made elsewhere.
- You do not need a Sam's Club membership to use the card at non-Sam's Club merchants, but you do need one to shop at Sam's Club itself.
- The card can be used internationally anywhere Mastercard is accepted, though foreign transaction fees may apply depending on your card terms.
Cash Back Rates: Where Your Rewards Are Highest
Sam's Club Mastercard cash back varies by where you use it. At Sam's Club locations and Sam's Club gas stations, you earn the highest rate. For all other purchases — restaurants, retail stores, online shopping, regular gas stations — you earn a lower, flat rate.
The exact percentages depend on which version of the Sam's Club Mastercard you hold. There are different cards with different benefits, so check your cardholder agreement or log into your account to see your specific rates. These rates can change, and the card issuer will notify you of changes in advance.
This structure is why many cardholders use the Sam's Club card primarily for Sam's Club purchases and keep another card for everyday spending elsewhere. You are not locked into using it only at Sam's Club, but the rewards math often points that way.
Using Your Card at Sam's Club Locations
To use your Sam's Club Mastercard at a Sam's Club warehouse, you need an active Sam's Club membership. The card itself is not a membership card — it is a payment method. You will need to show your membership card or provide your membership number at checkout.
If you do not have a Sam's Club membership, you cannot shop at Sam's Club warehouses, regardless of whether you have the credit card. Memberships are separate from the card and cost money. You can hold the credit card without a membership, but it will only work at non-Sam's Club merchants.
At Sam's Club gas stations, you also need an active membership to pump fuel. The card works as your payment method once you are a member.
Using Your Card Outside Sam's Club
Outside of Sam's Club, your card functions as a standard Mastercard. Grocery stores, pharmacies, restaurants, online retailers, utility companies, subscription services — anywhere that displays the Mastercard logo will take it. You do not need a Sam's Club membership to make these purchases.
Online shopping works the same way. You enter your card number at checkout just as you would with any other credit card. The merchant processes it as a Mastercard transaction.
One thing to watch: some merchants have minimum purchase amounts or may not accept certain card types. This is rare with Mastercard, but it can happen. If a merchant declines your card, it is usually a merchant-specific rule, not a problem with your card itself.
International Use and Foreign Transaction Fees
Your Sam's Club Mastercard can be used internationally at any merchant that accepts Mastercard. This includes ATMs, hotels, restaurants, and retail stores abroad.
However, foreign transaction fees may apply. Check your cardholder agreement to see whether your specific card charges a percentage fee when you use it outside the United States. These fees typically range from 1% to 3% of the transaction amount, though the exact rate depends on your card version and the card issuer's current terms.
If you travel frequently, compare your Sam's Club card's foreign transaction fee against other cards you hold. Some cards charge no foreign transaction fee, which can save you money on international purchases.
What Happens If You Don't Have a Sam's Club Membership
You can hold and use a Sam's Club Mastercard without a membership. The card will work at any Mastercard-accepting merchant worldwide. You simply cannot enter a Sam's Club warehouse or use Sam's Club gas pumps.
Some people get the card for the cash back on everyday purchases and never use it at Sam's Club. This is a valid choice, though the cash back rate outside Sam's Club is typically lower than what you would earn with a card designed for general spending. Run the numbers based on where you actually shop.
If you later decide to get a Sam's Club membership, your card will immediately work at Sam's Club locations once your membership is active.
Declined Transactions and Troubleshooting
If your Sam's Club Mastercard is declined at a merchant that accepts Mastercard, the issue is usually one of these: your account is frozen due to suspected fraud, you have reached your credit limit, your payment is overdue, or the merchant's system is temporarily down.
Contact Sam's Club's customer service number on the back of your card to find out why. They can tell you immediately whether the problem is on your end or the merchant's end. If your account was frozen for fraud protection, they can unlock it while you are on the phone.
At Sam's Club locations specifically, a declined card might also mean your membership has expired or lapsed. Check your membership status in your Sam's Club account online or ask at the membership desk.
Frequently Asked Questions
Can I use my Sam's Club card at Walmart or other retailers?
Yes. Your Sam's Club Mastercard works at Walmart, Target, Amazon, and any other merchant that accepts Mastercard. The card is not restricted to Sam's Club. You will earn cash back on these purchases, though the rate is typically lower than what you earn at Sam's Club itself.
Do I need a membership to get the card?
No. You can open a Sam's Club Mastercard without a membership. However, you will not be able to shop at Sam's Club warehouses or use Sam's Club gas stations without one. The card works everywhere else Mastercard is accepted.
What's the difference between using the card at Sam's Club versus other stores?
The cash back rate is higher at Sam's Club. At other merchants, you earn a lower flat rate. This is why the card is most valuable if you shop at Sam's Club regularly. If you rarely visit Sam's Club, a different card might earn you more cash back on your everyday spending.
Can I use my Sam's Club card internationally?
Yes, anywhere Mastercard is accepted. Be aware that foreign transaction fees may apply — check your cardholder agreement for the exact percentage. Some Sam's Club card versions charge these fees and others do not, depending on the specific card product.
What should I do if my card is declined?
Call the customer service number on the back of your card. They can tell you whether your account is frozen, you have hit your credit limit, your payment is overdue, or if the issue is with the merchant's system. They can often resolve the problem immediately.