Interchange Fees Explained: Who Actually Pays When You Swipe a Card

Every time a customer taps, swipes, or inserts a card, a small percentage of that sale is quietly routed away from the merchant before the money ever reaches their bank account. That fee is called interchange, and it is one of the least visible but most consequential mechanics in the payments system. Understanding who sets it, who pays it, and who benefits helps explain why some stores accept certain cards but not others, why cash discounts exist, and why lawmakers keep revisiting the topic.

What Interchange Actually Is

When a customer pays with a credit or debit card, the transaction passes through several parties: the merchant, the merchant's bank (the acquirer), the card network (such as Visa or Mastercard), and the cardholder's bank (the issuer). Interchange is the fee the acquirer pays to the issuer for each transaction, and it is set according to schedules published by the card networks. The acquirer typically passes this cost — plus its own markup — on to the merchant as part of the total fee for accepting cards, often called the merchant discount rate.

The stated rationale for interchange is that it compensates the issuing bank for extending credit, absorbing fraud risk, and funding rewards programs. Visa and Mastercard do not directly collect interchange themselves; instead, they set the rate schedules that member banks follow, which is why regulators have scrutinized whether this amounts to price-setting across a network of otherwise competing banks.

Why Rates Vary So Much

Interchange is not a single flat number. It depends on several factors, and both Visa and Mastercard publish detailed, tiered public rate tables for this reason.

• Card type: premium rewards and corporate cards generally carry higher interchange than basic or debit cards, because issuers use that revenue to fund cash-back and travel perks.
• Merchant category: grocery stores, gas stations, and certain nonprofits often qualify for lower rates than general retail.
• Transaction method: a chip or contactless in-person transaction is typically priced lower than a manually keyed-in or online transaction, which carries greater fraud risk.
• Card-present versus card-not-present status, and whether the transaction is verified through address or security-code matching.

The Durbin Amendment and Debit Card Caps

Unlike credit card interchange, which remains largely unregulated in the United States, debit card interchange for banks with more than $10 billion in assets is capped under Section 1075 of the Dodd-Frank Act, known as the Durbin Amendment, and implemented through the Federal Reserve's Regulation II. The rule sets a base cap plus a percentage of the transaction value, along with a small additional allowance for fraud-prevention costs, and the Federal Reserve periodically reviews and can adjust these figures. Community banks and credit unions under the $10 billion threshold are exempt from the cap, which is why some smaller issuers can still charge higher debit interchange.

How Merchants Push Back

Because interchange is a real and recurring cost — especially for thin-margin businesses like grocery stores and restaurants — merchants and their trade groups have pursued multiple strategies over the years: lobbying for legislative caps, challenging network rules in antitrust litigation, and in recent years, applying surcharges on credit card transactions where state law and network rules permit it. Many card networks require merchants to disclose surcharges clearly and cap them as a percentage of the transaction. Some states restrict or ban surcharging outright, so the rules a shopper encounters can differ depending on where they are standing at the register.

The Bigger Picture

Interchange sits at the center of an ongoing tension between payment networks and banks, who argue the fees fund fraud protection, innovation, and consumer rewards, and merchants, who argue the fees are set without real competitive pressure and simply get passed through in prices. Legislative proposals aimed at introducing routing competition for credit cards, similar to what already exists for debit under Durbin, have been debated in Congress in recent years without becoming law. For consumers, the practical takeaway is that the price on the shelf already reflects these fees to some degree, and the payment method chosen at checkout can occasionally trigger a visible surcharge or discount tied to this decades-old plumbing of card payments.

This article is for informational and journalistic purposes only and does not constitute financial or legal advice. Merchants and consumers seeking guidance on surcharge rules or payment costs should consult current network rules, state law, and a qualified professional.