Cashback programs often rely on merchant category codes to decide which purchases qualify. Understanding how these codes are assigned explains why a purchase at a familiar store might not earn the reward you expected.
Published September 15, 2026 · 2 min read
A merchant category code (MCC) is a code assigned to a business by payment networks based on the type of goods or services it primarily sells, used to categorize transactions. The code groups merchants into broad categories like groceries, dining, or fuel. Every card transaction carries the MCC of the merchant where the purchase was made.
Cashback or reward programs that apply only to specific categories, like groceries or dining, typically rely on a purchase's MCC to determine whether it qualifies, not on the specific item purchased. If a program offers bonus cashback on dining, only transactions with a dining-related MCC will trigger the reward. The system does not see individual items on a receipt, only the merchant's category.
A merchant's assigned MCC does not always match a customer's expectation — a store that sells multiple types of goods is usually assigned one code based on its primary business, which can mean not every purchase there falls into the category a shopper expects. A warehouse club might be coded as a general retailer, not as a grocery store, even if you bought only food. The code reflects the merchant's overall business, not the specific transaction.
Checking a card or cashback program's specific category rules, rather than assuming based on where a purchase feels like it belongs, avoids the surprise of a purchase not qualifying for an expected reward. Nexus Pay's card is funded from a crypto wallet across six networks, with in-app swaps and spending in one place, though cashback eligibility on any card depends on the merchant's assigned code. Reading the program's category definitions before relying on a reward helps set accurate expectations.
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