How to Read Your Card Fee: The Three Layers That Decide What You Keep

When a card sale posts, your statement shows one fee, but it is three charges in one line. The first goes to the bank that issued the card, the second to the card brand that routes the sale, and the third to your processor. To know what you keep, ask for the split before you compare totals.

Each layer behaves differently. Interchange is the part set by the issuer and cannot be negotiated away. Network assessment is tied to the card brand. Processor markup is the part you can shop. A blended rate hides those differences, so a processor that cannot show the split makes it harder to compare offers.

Interchange is the issuer's share

Interchange moves from the acquirer to the card issuer. The acquirer is the bank or payment company that accepts the card on your behalf. The issuer is the bank that gave the customer the card. That issuer decides its own share, and the rate can vary by bank, card type, and transaction details.

The base for interchange is the whole charge, so sales tax and a customer tip are included before the fee is computed. That can raise the fee on a sale that looks simple.

The blended average interchange rate for Visa and Mastercard, a mix of card types and transactions, reached 2.36% in 2025, up from 2.02% in 2010. Your exact rate depends on the card and the transaction.

Network assessment and processor markup are the layers you can compare

The card brand's assessment covers the network that routes the sale between banks. It is usually a small percentage or a fixed amount, but it is not the part you can trim by switching processors.

Your processor's markup is what your payment company adds for handling the sale. It can be a percentage, a flat fee, or a combination. This is the layer where one merchant can pay more than another for the same card sale.

Ask to see interchange, network assessment, and markup as separate lines. That split is what makes offers comparable, and it shows which part is set by the issuer and network, and which part is your processor's price.

State limits may not reach interchange

Because interchange is set by the issuer, a state rule that tries to cap it can run into federal preemption, where a federal rule overrides state law. The NCUA, the federal credit union regulator, has an interim final rule on federal credit union card fees that became effective on June 30, 2026. Under the rule, federal credit unions can charge interchange even when third parties set or consult on the fees.

The rule is designed to preempt state laws that reach non-interest charges and fees tied to payment card services. Illinois's Interchange Fee Prohibition Act would block issuers, networks, and acquirers from charging interchange on the state and local sales-tax and tip portions of a sale. A federal judge in Illinois ruled that current NCUA rules do not override the state law as applied to federal credit union credit and debit card interchange.

A state cap may reduce what an issuer can take on some parts of a sale, but it may not erase the issuer's share on the whole transaction. So a state rule can change the fee without changing the layer that sets interchange.

You can judge the fee by its split

Before you sign, get three answers: What is the interchange? What is the network assessment? What is the processor markup? If the answer is one blended number, the three layers are hidden.

Then compare the interchange against the card type and the full transaction amount. Check whether tax and tip are included in the base. Compare the processor markup against another offer for the same card sale. Use that comparison before you commit.

This article is general information, not tax or financial advice. Consult a qualified professional about your situation.