Merchant category code (MCC)
A Merchant Category Code (MCC) is a four-digit code assigned by card networks to classify the primary business activity of a merchant. Card networks and issuers use it to determine interchange rates, enforce card spend controls, calculate rewards, and meet tax reporting obligations on cardholder spending.
Every merchant that accepts card payments is assigned an MCC by their acquiring bank at onboarding. The code reflects what the merchant sells: airlines carry MCC 3000–3299, restaurants carry 5812, software companies carry 7372. These codes drive multiple downstream functions in the payments system.
For card issuers, MCCs are the primary mechanism for spend control policy. A corporate card program can be configured to approve transactions at approved merchant categories only and decline any transaction at categories outside policy. MCCs make this possible without requiring a list of specific approved merchants.
Interchange rates are also MCC-dependent. Card networks set reduced interchange for certain merchant categories, such as groceries, fuel, and utilities, that compete on margin and where standard interchange would be prohibitively expensive.
MCCs are the operational foundation of card spend control programs. Without MCCs, enforcing spend policy would require maintaining lists of specific approved merchants, which is not realistic at scale. MCCs also affect how card programs are regulated: certain MCC categories carry additional compliance requirements, and restricted categories such as gambling and adult content are excluded from many card programs.
- MCC misclassification is common; merchants are sometimes assigned incorrect MCCs that cause legitimate transaction declines
- Aggregated merchants such as Uber and Amazon may carry a single MCC that doesn't reflect the diverse nature of purchases
- MCC-based spend controls require regular review as business spending patterns evolve
- International merchants may carry different MCCs than domestic equivalents
- Restricted MCC management requires ongoing monitoring and exception handling
A corporate travel card program configures MCC-based controls allowing transactions only at airlines (MCCs 3000–3299), hotels (3501–3999), car rental (3351–3441), restaurants (5812), and fuel stations (5541). When an employee attempts to use the travel card at an electronics retailer (MCC 5732), the transaction declines automatically.
Related Concepts
Nium's card issuing platform supports MCC-based spend control configuration at the program, group, and individual card level. Program managers can define allowed and blocked MCC lists, configure specific MCC exceptions, and monitor MCC-level spending analytics through Nium's management console.
Answers you didn't know you needed.
How is an MCC assigned?
MCCs are assigned by the merchant's acquiring bank at onboarding, based on the primary business activity declared. Merchants can request MCC changes if their classification is incorrect.
Can a merchant have more than one MCC?
Typically a merchant has one primary MCC. Some large merchant platforms operating across multiple business types may have different MCCs for different payment contexts.
What MCCs are typically blocked on corporate card programs?
Common blocked categories include gambling (MCC 7995), adult entertainment (MCCs 5967, 7273), cash advances (MCC 6010), and sometimes alcohol retailers.
How do MCCs affect interchange rates?
Card networks publish interchange rate schedules that vary by MCC. Merchants in low-margin, high-volume categories, such as supermarkets (MCC 5411) and fuel stations (MCC 5541), qualify for reduced interchange.
Can card spend controls be set at the individual MCC level?
Yes. Nium's card issuing platform allows MCC-level spend control configuration: issuers can approve specific MCCs, block specific MCCs, or set different spending limits per MCC category at the program, group, or individual card level.