MCC Codes: What They Are and Why Yours Matters
A merchant category code is a four-digit code that classifies what your business sells. Your acquirer assigns it during onboarding, and it influences interchange, whether issuers approve your transactions, and which acquiring programmes you are eligible for.
What the MCC affects
- Interchange, and therefore a meaningful part of your cost.
- Issuer risk scoring and authorisation behaviour.
- Whether your category needs registration or is prohibited by a given acquirer.
- Which scheme rules and monitoring programmes apply to you.
How it is assigned
The acquirer selects the MCC based on your actual products and website during underwriting. You can argue for a more accurate code with evidence, but you cannot choose one for cost reasons, deliberately using a misleading MCC (transaction laundering) breaches scheme rules and typically leads to termination.
When the wrong code is a real problem
A mismatched MCC can raise your costs, depress approval rates or place you under monitoring rules meant for a different category. If your catalogue has shifted since onboarding, ask your acquirer to review the classification with current examples of what you sell.
Mixed catalogues
If you sell across categories, you may need more than one MID so each product line is processed under the correct code. Raise this early: retrofitting a split later means re-onboarding.
Related pages
Related guides
What is a merchant account?
A merchant account is an account held with an acquiring bank that allows you to accept card payments and receive settlement. It is not a business bank account: funds pass through it, are netted against refunds, fees and any reserve, and are then paid out to your ordinary bank account.
What is an acquirer?
An acquiring bank is licensed by the card schemes to accept card transactions on your behalf, holds your merchant account, and settles the funds to your bank. It also carries the financial risk if you cannot refund your customers, which is why the acquirer, not the gateway, decides whether you are accepted.
High-risk payment processing
High risk is a classification applied by acquirers and card schemes, not a judgement about your business. It means your industry, business model or dispute profile creates more potential refund and chargeback liability, so fewer providers will underwrite you and terms include tighter controls.
Find a payment provider that fits your business
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