The Sam's Club Mastercard works at most places that take Mastercard, but not everywhere

The Sam's Club Mastercard is a Mastercard, which means it works anywhere Mastercard is accepted — roughly 29 million locations worldwide. But it has limits you should know about. You cannot use it at Costco, other warehouse clubs, or some gas stations that only take their own branded cards. You also cannot use it outside the United States, even though Mastercard itself works internationally. The card is designed to give you rewards at Sam's Club and gas pumps, so those are the places where it makes the most sense to use it.

Understanding where your card works and where it does not helps you decide whether to carry it alongside another card for travel or warehouse shopping at competitors. Most everyday spending — groceries, restaurants, online shopping, utilities — will go through without a problem. The real restrictions are international travel and competing warehouse clubs.

Key Takeaways

  • The Sam's Club Mastercard works at any store, restaurant, or online retailer that accepts Mastercard within the United States.
  • You cannot use it at Costco, BJ's Wholesale, or other warehouse clubs, and it will not work outside the U.S. borders.
  • Some gas stations and fuel pumps only accept their own branded cards or specific networks, so check before you pump.
  • The card earns higher cash back at Sam's Club locations and at gas pumps, so using it elsewhere means you earn the standard rate.

Where the Sam's Club Mastercard actually works

You can use your Sam's Club Mastercard anywhere Mastercard is accepted in the United States. That includes grocery stores, restaurants, online retailers like Amazon, pharmacies, utilities, and subscription services. If a store has a Mastercard logo or tells you it accepts Mastercard, your card will work there.

The card works at ATMs that accept Mastercard, though you will pay a fee if the ATM is not owned by your card issuer. Gas pumps at most major chains — Shell, Chevron, Exxon, BP, and others — accept it. Walmart, Target, and other major retailers take it. The point is simple: if you see the Mastercard logo, you can use your Sam's Club card.

Places where your Sam's Club card will not work

Your Sam's Club Mastercard will not work at Costco, BJ's Wholesale Club, or other warehouse competitors. These clubs have their own membership systems and do not accept outside credit cards at checkout. If you shop at multiple warehouses, you will need a separate card or payment method for each one.

The card does not work outside the United States. If you travel internationally, you will need a different card that supports foreign transactions. Some gas stations — particularly independent ones or those with their own fuel networks — only accept their branded card or specific payment methods, so you may run into a pump that declines your Mastercard, though this is rare. American Express and Discover cards are not accepted everywhere Mastercard is, but your Sam's Club Mastercard is a Mastercard, so it has wider acceptance than those networks.

How rewards change depending on where you use the card

The Sam's Club Mastercard earns different cash back rates depending on where you swipe it. At Sam's Club locations, you earn a higher rate — currently 2% cash back on most purchases, with higher rates on gas and travel. At gas pumps outside Sam's Club, you earn a different rate (currently 1% on most gas). Everywhere else — restaurants, groceries, online shopping — you earn a base rate of 1% cash back.

This means using the card at a regular grocery store instead of Sam's Club will earn you less cash back. If you are not a Sam's Club member, the card is less valuable because you cannot access the higher rewards rates. The card is designed to reward you for shopping at Sam's Club and filling up at the pump, not for everyday spending at other retailers.

What happens if a store declines your card

If a store says your Sam's Club Mastercard is declined, the most common reason is that your account has reached its credit limit, you have missed a payment, or the card is flagged for fraud. Call the customer service number on the back of your card to find out why.

Occasionally, a store's payment system may have a technical issue or may not be set up to process Mastercard at that moment. If this happens, ask the cashier to try again or offer to pay a different way. If the same store consistently declines your card, contact Sam's Club customer service — there may be a merchant-level issue they need to resolve.

Using your Sam's Club card online and over the phone

You can use your Sam's Club Mastercard for online shopping at any retailer that accepts Mastercard. Enter your card number, expiration date, and CVV (the three-digit code on the back) just as you would with any other credit card. Most major retailers — Amazon, Walmart, Target, Best Buy — accept it without issue.

For phone orders, give the merchant your card number and expiration date. Some merchants may ask for your billing zip code or CVV for security. Your card works the same way over the phone as it does in person, with the same fraud protections Mastercard provides.

International travel and currency exchange

The Sam's Club Mastercard does not work outside the United States, so you cannot use it in Canada, Mexico, Europe, or anywhere else internationally. If you travel abroad, you will need a different credit card that supports international transactions, or you can use cash and local ATMs.

Some credit cards charge foreign transaction fees (usually 1% to 3% of the purchase), while others do not. Since the Sam's Club card does not work internationally at all, this is not a consideration for that card. If you travel frequently, look into a separate card designed for international use.

Frequently Asked Questions

Can I use my Sam's Club card at Walmart?

Yes. Walmart accepts Mastercard, so your Sam's Club Mastercard will work there. You will earn 1% cash back on most purchases at Walmart, not the higher rate you would earn at Sam's Club.

What if I do not have a Sam's Club membership?

You can still get and use the Sam's Club Mastercard at any store that accepts Mastercard. However, you will not be able to shop at Sam's Club itself without a membership, so you lose access to the higher rewards rates that make the card valuable. Without a membership, the card is just a standard Mastercard with lower cash back rates.

Does my Sam's Club card work at gas pumps?

Yes, at most major gas station chains. You will earn a higher cash back rate at Sam's Club fuel pumps than at other gas stations. Some independent gas stations may not accept Mastercard, so check before you pump.

Can I use it to pay my utilities or subscriptions?

Yes. You can use your Sam's Club Mastercard to pay electric bills, internet, phone service, streaming subscriptions, and other recurring charges. Treat it like any other Mastercard for these payments.

What should I do if a store says it does not accept Mastercard?

Ask the cashier to try running it again, or offer an alternative payment method. If the store genuinely does not accept Mastercard, you will need to use a different card, cash, or a digital payment app. This is rare — most retailers accept Mastercard.