What are merchant category codes? Everything your business needs to know

Key takeaways

• A Merchant Category Code (MCC) is a standardised four-digit code defined by ISO 18245 that card networks such as Visa and Mastercard use to identify a business by the goods or services it primarily sells.

• Your code has real commercial weight – it directly influences your interchange fees, chargeback exposure, customer rewards accrual, and – in Australia – your Fringe Benefits Tax (FBT) reporting obligations.

• Airwallex Corporate Cards let you set allowlists for approved merchant categories at the card level, so you can enforce spend policies and reduce budget leakage.

Every card transaction carries a hidden four-digit tag that determines how much you pay in processing fees, whether your customers earn rewards, and how the ATO classifies the expense. That tag is the merchant category code, and some business owners have never even heard of it. 

Cards remain the most widely used payment method in Australia, used for the bulk of everyday consumer transactions, which makes understanding these codes worthwhile when you're weighing up how to choose a business bank account to keep your card costs down.

Cards are the most commonly used payment method in Australia, making understanding these codes worthwhile when weighing up your card acceptance options to keep costs down.

What is a merchant category code (MCC)?

Before you take your first payment, the global card network has already decided how to treat your business. When a customer pays, the transaction data travels through the acquirer to the card network and then to the card issuer – with a four-digit tag carried at each step.

That tag tells the payment system exactly what you sell. If you deal with global vendors, understanding these codes matters as much as knowing what a multi-currency account is, because both shape your final transaction costs.

The International Organisation for Standardisation (ISO) governs these codes under ISO 18245:2023 – a universal taxonomy that keeps categorisation consistent across borders. Most small businesses receive a generic code, such as MCC 5411 for grocery retail or MCC 5812 for restaurants. Large companies, like major airlines and hotel chains, often hold their own merchant-specific codes.

How are merchant category codes assigned?

You don't choose your own code – your acquirer assigns it, and a mistake at setup can inflate your card fees for years. When you first set up your payment processor or acquiring bank, they designate your code based on your declared business activity. If you operate across multiple industries, the code reflects your primary line of business (the category that generates most of your revenue). A bakery that occasionally sells baking books, for example, gets a bakery code, not a bookshop code.

Some businesses split their operations across distinct Merchant Identification Numbers (MIDs) to obtain separate codes. Consider a car dealership that separates new vehicle sales from its mechanical repair workshop. This is worth doing when a secondary segment is high-volume and qualifies for a lower-risk, lower-cost category. It takes more bookkeeping, but it can meaningfully cut your processing costs.

What are the merchant category code ranges?

Figuring out where your business fits shouldn't feel like guesswork. Here's a quick look at the standard ranges used to classify different industries.

Visa, Mastercard, American Express, and Discover each maintain their own MCC lists, but all align closely with the ISO standard. Keep this table handy when you review your processing statements or set card limits for your team.

How merchant category codes affect your business operations

Every time a customer taps their card, your code dictates how much of that sale lands in your account. Here are the four areas where it shapes your day-to-day.

Interchange fees and processing costs. Card networks apply different interchange rates based on risk. Lower-risk categories like utilities and supermarkets attract lower fees; higher-risk categories like online pharmacies and gambling pay more. If your business has the wrong code, you could be overpaying on every transaction.

High-risk classifications and chargeback programmes. Networks run monitoring programmes for merchants with high chargeback rates. An incorrect code can trigger mandatory registration programmes that bring extra fees and stricter dispute rules. Networks also use codes to flag suspicious transaction patterns in real time, which means a misclassified transaction can be declined for suspected fraud.

Customer rewards and cashback. Issuing banks use codes to decide whether a purchase qualifies for bonus points or cashback. If your business is misclassified, your customers miss out on rewards – and that can send them elsewhere.

Restricted payment types. Some cards only work at pre-approved codes. In Australia, salary packaging and meal-entertainment cards work only in approved categories. If an employee tries to use a meal card at a merchant that isn't classified under MCC 5812 (eating places and restaurants), the sale is declined instantly. Our guide to virtual cards: benefits and disadvantages explains how digital card limits help you protect cash flow.

MCCs, tax reporting, and salary packaging in Australia

The ATO watches business spending closely, and an untagged transaction can quickly become a Fringe Benefits Tax (FBT) headache. If you use employee cards to cover work-related expenses, you need a clean way to track where every dollar goes.

ATO and Fringe Benefits Tax (FBT)

Restricted-use benefit cards rely on real-time code whitelisting to stay within ATO rules. Meal-entertainment cards, for instance, are typically whitelisted only for MCC 5812 (eating places and restaurants). If an employee tries to buy groceries or retail items, the network blocks the transaction automatically – helping protect you from the 47% FBT rate on non-exempt benefits.

Salary packaging compliance

Employers and salary packaging providers use card-level limits so employees spend benefit funds only at eligible merchants. This protects your FBT position and keeps your benefits package compliant without manual audits.

Corporate expense policy enforcement

Your finance team can use these codes to restrict company cards to approved categories like travel, accommodation, and office supplies. This cuts out manual expense reviews and stops rogue spending before it happens.

What the RBA's surcharging reforms mean for card costs

Card costs are about to shift in a big way, which makes your payment setup more important than ever. Following its March 2026 Conclusions Paper, the RBA confirmed that surcharging on debit, prepaid, and credit cards across the designated eftpos, Mastercard, and Visa networks ends on 1 October 2026. From that date, you can no longer pass card fees on to your customers. The cost of acceptance shifts back to you, which makes understanding your interchange costs, and the code that drives them, more commercially important, not less.

To help with the transition, the RBA is also lowering domestic interchange caps on 1 October 2026, which should reduce card acceptance costs – particularly for small businesses, who tend to pay fees closest to the existing caps. A new cap on foreign-card interchange follows on 1 April 2027, which is welcome news if you take payments from international cardholders. The table below summarises the new caps.

Why businesses choose Airwallex for global spend management

When you're scaling globally, chasing paper receipts and absorbing high card fees slows you down. Airwallex takes the friction out of global business finance with a modern financial platform that keeps you in control.

Merchant and category controls. Airwallex Corporate Cards  let you set smart spending rules from your dashboard. Set an allowlist of approved merchant brands or categories pm amu card – transactions outside the approved list are declined instantly, giving you real-time control over procurement spend. Our guide to virtual cards shows how this helps you lock down procurement budgets.

Accounting integrations for automatic expense categorisation. Card transactions sync automatically with Xero, QuickBooks, and NetSuite, with transaction metadata carried through so your accounting software categorises expenses accurately – no manual data entry.

Multi-currency settlement without forced FX conversion. With Airwallex Global Accounts, you can receive, hold, and pay out in 20+ currencies without automatic conversion — avoiding the costly forced FX that eats into margins on international transactions. If you're paying overseas vendors, our guide to paying overseas contractors shows how local rails cut costs.

Frequently asked questions (FAQ)

What does MCC stand for? 

It stands for Merchant Category Code – a four-digit number that payment networks use to classify your business based on what you sell.

How do I find my business's merchant category code? 

You can usually find it on your card statements or by logging into your payment gateway dashboard. If it isn't clear, your payment processor or acquiring bank can confirm it for you.

Can I change my business's MCC if it's been assigned incorrectly? 

Yes, though it takes some work. Contact your payment processor and ask them to update it. You'll need to show that your primary source of revenue belongs to a different category.

Why was my transaction declined because of an MCC restriction? 

If you paid with a restricted card, the issuer likely blocked the transaction because the merchant's code wasn't on the approved whitelist. This is common with corporate cards and salary packaging accounts that limit spending to specific categories.

Do MCCs affect how much I pay in credit card processing fees? 

Yes – they directly influence your interchange fees. Networks set these rates based on the average risk of each industry, so an incorrect code can cause you to overpay on every card payment you take.

Sources

1. https://www.iso.org/standard/79450.html

2. https://usa.visa.com/content/dam/VCOM/download/merchants/visa-merchant-data-standards-manual.pdf

3. https://www.rba.gov.au/payments-and-infrastructure/review-of-retail-payments-regulation/2026-03/

This information doesn’t take into account your objectives, financial situation, or needs. If you are a customer of Airwallex Pty Ltd (AFSL No. 487221) read the Product Disclosure Statement (PDS) for the Direct Services available here.