Card Interchange Fees Explained: Who Pays and Why

Interchange fees explained: start with who receives the money

A merchant’s card-processing bill is not a single fee paid to a single business. It combines charges for different participants and services. Interchange is one component—not another name for the entire bill.

In a typical card purchase, the merchant’s financial institution, known as the acquirer, pays interchange to the cardholder’s financial institution, known as the issuer. The merchant pays its own provider a merchant service charge, sometimes called the merchant discount. Visa explains this distinction.

That distinction matters when negotiating a contract. A provider can reduce its own margin without changing interchange. Conversely, a regulatory interchange cap does not automatically cap the merchant’s total acceptance cost.

The useful question is therefore not simply, “What is the interchange rate?” It is: “Which charges apply to our transactions, who receives them, and which can we control?”

Follow a card payment through the system

The conventional arrangement separates the cardholder, issuer, merchant and acquirer. The card network supplies the scheme connecting participating institutions. Some business arrangements combine roles, so a familiar checkout brand does not necessarily identify every institution involved. The EU Interchange Fee Regulation describes the principal scheme structures.

For a standard purchase, interchange transfers value from the acquiring side to the issuing side. The merchant’s contract determines how acceptance charges are recovered from the merchant. Visa’s explanation of interchange and merchant discount makes clear that these are related but distinct payments.

Who ultimately bears the economic cost is a broader question. For business planning, merchants should treat acceptance charges as an expense that must be absorbed through margin, reflected in general pricing, or addressed through lawful payment choices. They should not assume that a separate checkout surcharge is available.

Why does interchange exist?

Visa describes interchange as a mechanism for balancing participation on the issuing and acquiring sides: encouraging institutions to issue cards while maintaining merchant acceptance. That is the network’s explanation of the mechanism, not proof that every published rate represents the minimum efficient cost. Visa’s public rules discuss this balancing function.

Interchange revenue should not be confused with issuer profit. An issuer also operates a card business with servicing, processing, security and other obligations. Equally, a merchant should not assume that paying interchange eliminates its own fraud or dispute exposure.

Separate the layers of the merchant bill

A useful cost review distinguishes the recipient of a fee from the label appearing on an invoice.

Provider pricing illustrates why the layers matter. Adyen separates processing charges from payment-method charges, while Stripe’s pricing disclosures distinguish payment processing from additional services and charges.

Issuer costs and acquirer costs are also different concepts. Interchange is revenue received by the issuer; it is not an itemised reimbursement of every expense on the issuing side. The Federal Reserve separately examines issuer processing costs, interchange revenue and fraud losses in its debit-card cost research.

For an invoice review, ask the provider to identify the underlying fee, its recipient and any additional margin. A line labelled “network costs” is not enough information to establish that it contains only unmarked-up scheme charges.

In the EU: caps apply to interchange, not the whole bill

In the EU, the general interchange ceilings are 0.2% for consumer debit transactions and 0.3% for consumer credit transactions. National rules can introduce lower limits and certain domestic debit arrangements.

Scope matters. The regulation generally concerns transactions where both the payer’s and payee’s payment service providers are located in the EU. Its interchange-cap provisions exclude commercial-card transactions and certain other categories. A merchant’s location alone therefore does not establish that every incoming card payment qualifies. The regulation sets out these boundaries.

Commercial cards deserve particular attention in business-to-business payments. The European Commission confirms that the caps are limited to consumer cards. An acceptance forecast based entirely on consumer-card economics is inappropriate for a business serving corporate purchasers.

A practical EU cost calculation

Using a purchase amount of €100 solely as an arithmetic illustration, the general consumer debit ceiling produces €0.20 of interchange, while the consumer credit ceiling produces €0.30.

These are calculated interchange amounts, not provider quotes or total processing prices. Scheme charges, acquiring charges and other contractual costs still need to be assessed.

For a merchant facing a larger total deduction, the next step is reconciliation—not an immediate conclusion that the cap has been breached. Establish the card category and geographic scope, then separate interchange from the remaining charges.

In the US: distinguish covered debit from other cards

The US framework is not an equivalent consumer debit-and-credit percentage cap.

For debit transactions subject to Regulation II’s fee standard, the Federal Reserve specifies a ceiling of 21 cents plus 5 basis points of transaction value. An eligible issuer may receive an additional 1 cent for fraud prevention.

The small-issuer exemption generally applies to issuers with assets below $10 billion, including affiliates. Certain government-program and prepaid transactions also have exemptions subject to conditions.

Consequently, “debit” is not a sufficient pricing classification. Merchants need to distinguish covered from exempt transactions.

The US debit cap is under legal challenge

The Regulation II ceiling described above is not settled. On 26 October 2026 the US Court of Appeals for the Eighth Circuit affirmed a lower-court judgment vacating the 21-cent standard, holding that the Federal Reserve had included costs the statute does not allow, and sent the rule back to the Board without setting a replacement. The decision does not change fees automatically: it takes effect only once the court's mandate issues, and further appeals or new rulemaking are possible. The Federal Reserve's separate 2023 proposal to lower the cap was never finalised.

For planning in the US, treat the current covered-debit formula as subject to change and monitor Federal Reserve announcements rather than locking long-term pricing assumptions to it.

A practical US cost calculation

Using $100 solely as an arithmetic illustration, the covered-debit base formula produces $0.26 of interchange. Including the eligible fraud-prevention adjustment produces $0.27.

Again, this is not the merchant’s total acceptance cost.

Do not apply the covered-debit formula to credit cards. Visa’s published US schedules distinguish credit products, merchant categories and transaction programmes, as well as regulated and exempt debit.

For planning, build separate cost assumptions for materially different card categories rather than applying a single “US interchange rate.”

Routing can matter independently of the interchange cap

In the US, Regulation II also addresses network availability and merchant routing choice. These obligations are distinct from the interchange-fee ceiling. The Federal Reserve’s routing guidance explains that issuers and networks must not inhibit merchants from directing eligible debit transactions over an available network.

This is an operational issue, not just a contract clause. The Federal Trade Commission’s Mastercard enforcement action concerned restrictions affecting competing networks for online wallet debit transactions.

A payments team should ask its provider:

• Which eligible routes are technically available?
• Who controls route selection?
• Are online and wallet transactions supported?
• How are network charges, authorisation outcomes and operational performance compared?
• Can the merchant audit the route actually used?

A lower quoted routing cost is not enough. Evaluate the completed payment and its associated losses and expenses. Our guide to payment orchestration platforms explores the wider control problem.

Read the pricing contract before comparing offers

A practical comparison should reconstruct each offer using the merchant’s own transaction mix.

Bundled pricing

A bundled tariff combines underlying acceptance costs into a simpler quoted price. Stripe’s pricing page provides an example of published transaction pricing alongside separately disclosed charges.

The attraction is easier forecasting. The limitation is reduced visibility into the relationship between underlying costs and the amount charged. Check which card categories, international payments and additional services fall outside the headline tariff.

Interchange-based pricing

An interchange-based contract exposes more of the underlying cost structure. Adyen describes its Interchange++ approach as separating interchange, scheme fees and acquiring charges.

That can improve analysis, but transparency is not the same as low cost. The merchant still needs to examine markup definitions, minimum commitments and charges outside the core processing formula.

For either approach, request a worked reconciliation using an actual statement. Compare like-for-like transactions and confirm whether any proposed saving depends on a different card mix, routing configuration or service package.

Risks and costs

The largest mistakes often come from treating a partial fee reduction as a complete business improvement.

Misclassification and qualification risk

Incorrect assumptions about consumer versus commercial cards, issuer location or regulated-debit status can undermine forecasts. Published interchange programmes also contain eligibility conditions; Visa’s US schedule explicitly distinguishes qualifying categories.

Keep classification evidence and investigate unexplained changes rather than assuming the cheapest schedule applies.

Surcharging and disclosure risk

In the EU, merchants cannot generally surcharge consumer cards covered by the applicable prohibition. Exceptions and national restrictions require separate analysis; Your Europe explains the consumer-card rule and principal exceptions.

In the US, do not treat surcharge permission as universal across jurisdictions or card types. Check applicable law and scheme requirements before implementation. Visa’s US merchant guidance addresses credit-card surcharging requirements.

Relabelling a charge should not be treated as a compliance strategy.

Refunds, disputes and additional charges

Confirm what happens when a payment is refunded or disputed. Do not assume that reversing the sale reverses every associated expense. Stripe’s disclosures illustrate why refund treatment, dispute charges and additional services need separate review.

Execution and switching risk

Before changing providers or routing rules, test authorisation performance, reconciliation, refund handling and operational recovery. Include integration work, staff time and contractual exit terms in the business case.

A sensible decision metric is net payment contribution: revenue successfully collected, less acceptance expenses, payment losses and operating costs. A cheaper fee line is useful only if the broader economics remain sound.

Bottom line

Interchange goes to the issuer, while merchants pay an acceptance bill containing additional costs. EU and US rules constrain different parts of that system and cover different transaction categories.

Start with transaction classification, reconcile the fee layers and test proposed changes against total payment economics. That approach is more useful than treating a regulatory ceiling—or a provider’s headline rate—as the complete cost of accepting cards.