Complete guide to MCC codes: what they are, how they're assigned, which ones are high risk, and how your MCC code affects your processing rates, approval odds, and account stability.
Your MCC code is a four-digit number that defines your business in the eyes of every bank, card network, and payment processor. It affects what rates you pay, whether you get approved, and how much scrutiny your account receives. Most merchants never think about it until something goes wrong.
A Merchant Category Code is a four-digit classification assigned to every business that accepts card payments. Originally created by the IRS for tax reporting, MCC codes are now used by card networks and processors to:
There are approximately 700 active MCC codes, ranging from 0742 (Veterinary Services) to 9950 (Intra-Government Purchases).
When you apply for a merchant account, your processor assigns an MCC code based on your business description, website, and application details. This happens during underwriting, and most merchants never know which code they received.
The problem: your assigned MCC code might not match your actual business. A supplement company could get coded as a pharmacy (5912). A SaaS company could get lumped in with gambling services. And a wrong code creates problems that compound over time.
Different MCC codes carry different base interchange rates. Supermarkets (5411) pay lower interchange than online retailers (5999) because of historically lower chargeback rates. This rate difference can be 0.5-1.0% per transaction.
Certain MCC codes are restricted or prohibited by many processors. If your business maps to one of these codes, mainstream processors will decline your application regardless of your business's individual merits.
High-risk MCC codes trigger higher reserve requirements. Where a low-risk merchant might have no reserve, a high-risk MCC can require 5-10% of processing volume held in reserve for 6-12 months.
Processors monitor high-risk MCC codes more aggressively. A chargeback ratio that's fine for a low-risk MCC might trigger a review or termination for a high-risk one.
If your business is miscategorized:
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