Every business that takes card payments has a four digit number attached to its merchant account. It is called the merchant category code, or MCC, and most business owners never see it. It is set when the account is opened, it travels with every single card payment you take, and it quietly decides how your customers’ banks see you. Having looked at merchant accounts for years, I would put the merchant category code in the top three things business owners should understand and almost never do.
What a merchant category code is
A merchant category code describes what your business mainly does. A restaurant is 5812, a hotel is 7011, a jeweller is 5944, a dentist is 8021. The codes are a shared standard used by the card schemes, so a payment coded as a hotel stay means the same thing to a bank in Leeds as it does to a bank in Lisbon.
Your payment provider chooses the code when your account is opened, based on what you tell them about your business. You do not pick it from a list yourself, but you should know what it is and you should be confident it describes you properly. Our merchant category code guide lists the codes UK businesses come across most, in plain English.
Why your merchant category code matters
Your customers’ banks read it. Banking apps use the code to sort spending into categories. Many UK banks also let customers block whole categories, gambling being the best known example. If your business is coded in a category your customer has blocked, their payment fails, and neither of you will be told why.
The card schemes have rules for some categories. Certain codes come with specific requirements. Mastercard’s rules say the purchase of cryptocurrency must use 6051, the sale of prescription medicines must use 5912 or 5122, and tobacco products must use 5993. Your provider handles the scheme side, but it explains why the same product can be treated very differently depending on how it is coded.
Card issuers treat categories differently. Some card issuers decline certain categories on certain cards. Quasi cash, the category for crypto purchases, is a common example, and some credit cards treat it like a cash withdrawal.
Your statement descriptor sits alongside it. The code and the name on your customer’s statement together decide whether a customer recognises a payment. A payment nobody recognises becomes a dispute.
Not sure your current account is coded correctly for what you sell?
What happens when your merchant category code is wrong
A business coded as general retail that in fact sells a specialist product is the most common problem I see. It works fine until the product range grows or a routine review looks more closely, and then the account is restricted or closed because what is being processed no longer matches what was agreed. The fix is simple and boring. Describe your business accurately when you apply, record what you sell in your merchant agreement, and tell your provider when the business changes.
The opposite problem happens too. A business placed in a stricter category than it needs can see more declines than it should. Either way, the answer is the same. Know your code.
How to find your merchant category code
Ask your payment provider. It is often on your merchant agreement or onboarding paperwork, and sometimes in your merchant dashboard. If nobody can tell you, that is worth knowing in itself.
My view
The merchant category code is the most important number on your merchant account that nobody explains to you. It costs nothing to ask what yours is, and it can save you an account closure later. If you are in a specialist sector, such as hotels, online pharmacy, crypto or high value goods, it matters even more.
Disagree? I would like to hear the other side. Tell me on LinkedIn.