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Merchant classification

Merchant Category Codes: What High-Risk Merchants Need to Know

A merchant category code (MCC) is a four-digit code used to classify a merchant by its primary type of business.

MCCs support payment-network and acquirer processes, but they are not a complete description of a business and they do not replace underwriting.

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The acquirer is responsible for assigning the appropriate MCC under the applicable network standards. Merchants should describe their activity accurately and ask the provider to confirm how the business will be classified.

01

What an MCC does

ISO 18245 defines code values used to classify merchants by the goods or services supplied. Card networks publish their own merchant-data standards and detailed descriptions for use in their systems.

The code communicates the merchant's primary activity; it does not prove licensing, eligibility or provider acceptance.

02

Who assigns the code?

The acquiring side assigns the MCC based on the merchant's actual business. The merchant should provide a clear product description, website, transaction flow and supporting evidence so the provider can classify the activity accurately.

03

Why accurate classification matters

  • Network rules and programme requirements can refer to merchant categories.
  • Provider risk appetite may differ by activity.
  • Pricing or operational controls may vary by route.
  • An inaccurate code can create monitoring, compliance or continuity problems.
04

MCC is not the whole risk profile

Two merchants with the same MCC can have different products, licences, customer geographies, chargeback histories and fulfilment models. Providers therefore assess the code together with the complete underwriting file.

05

What merchants should check

  1. Describe the activityUse precise language that matches the website and transaction flow.
  2. Confirm the primary businessExplain mixed models or material secondary activities.
  3. Ask the acquirerConfirm the assigned MCC and the basis for the classification.
  4. Review changesTell the provider when the product or revenue mix changes materially.
06

Do not use a code to disguise the business

Choosing a less sensitive description or processing under an unrelated merchant category does not create a compliant route. The sustainable approach is accurate classification and a provider whose appetite fits the real activity.

07

Using MCCs in provider matching

The MCC can be one assessment input, but matching also needs the industry, entity, geographies, payment methods, volume and licensing position. Relevant introductions remain subject to the provider's own classification and underwriting.

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Clear answers

Frequently asked questions

What does MCC stand for?

Merchant category code.

How many digits does an MCC have?

MCCs are four-digit codes used to classify merchants by business category.

Can a merchant choose its own MCC?

The acquirer assigns the code. The merchant should provide complete and accurate information and confirm the classification with the provider.

Is an MCC the same as a high-risk label?

No. An MCC classifies activity; risk appetite and underwriting consider many additional factors.

Can an MCC guarantee payment-provider acceptance?

No. Provider eligibility and terms depend on the complete setup and underwriting.

Evidence

Primary sources

Last reviewed: 1 September 2026