Interchange Fees Explained

Every time a customer taps a card to pay, a small percentage of that transaction is quietly redirected away from the merchant before the rest reaches their bank account. That redirected amount is the interchange fee — one of the least visible but most consequential charges in the entire payments ecosystem, and a cost that finance teams running any kind of card-accepting business need to understand in order to manage their payment processing costs properly.

What Is an Interchange Fee?

An interchange fee is a fee paid by the merchant's bank (the acquirer) to the cardholder's bank (the issuer) every time a card payment is processed. It's set by the card network — Visa, Mastercard, and similar schemes — as a published rate, usually expressed as a percentage of the transaction value plus a small fixed amount, and it varies by card type, transaction type, and merchant category. Although the acquirer technically pays it, the cost is passed through to the merchant as part of the overall fee they're charged for accepting card payments, making interchange the single largest component of most merchants' card processing costs.

Why Interchange Fees Exist

Interchange compensates the card issuer for the costs and risks it takes on in every transaction: extending credit (for credit cards), covering fraud losses, funding card rewards and cashback programmes, and processing the payment itself. In theory, this fee structure is what makes card networks work as a "four-party" system — cardholder, merchant, issuer, and acquirer — by giving issuers a commercial incentive to issue cards and extend the infrastructure that makes card payments possible in the first place, even though the merchant is the one ultimately bearing most of the cost.

What Determines the Rate

Interchange rates aren't flat — they vary significantly based on several factors. Card type matters a great deal: premium rewards and corporate cards typically carry higher interchange than standard debit cards, because issuers need to fund more generous rewards programmes and corporate cards tend to have higher average transaction values and lower fraud rates. Transaction method matters too — a card present, chip-and-PIN transaction is generally cheaper to process than a card-not-present online transaction, which carries higher fraud risk and therefore a higher rate. Merchant category codes also drive different rates, with certain sectors like fuel, supermarkets, or charities sometimes qualifying for preferential rates under specific card scheme programmes.

Regulation of Interchange Fees

Because interchange is effectively set collectively by the card networks rather than through direct negotiation between issuer and merchant, it has attracted significant regulatory scrutiny across major markets. The EU's Interchange Fee Regulation caps consumer debit and credit card interchange at 0.2% and 0.3% of transaction value respectively, and similar caps apply in the UK following its post-Brexit adoption of equivalent rules. The US has taken a narrower regulatory approach, with the Durbin Amendment capping debit card interchange for larger banks but leaving credit card interchange largely unregulated, which is part of why US merchants often face materially higher card acceptance costs than their European counterparts.

How This Affects Merchants and Finance Teams

For a finance team running a payments-heavy business, interchange isn't just a line item to accept — it's a cost that can be actively managed. Understanding the fee structure helps when negotiating with acquirers (some pass through interchange directly with a transparent markup, others blend it into a flat rate that can obscure the true underlying cost), when deciding which payment methods to steer customers toward, and when evaluating newer payment rails. This is part of why embedded finance and alternative payment methods such as account-to-account transfers have gained traction with some merchants — they can bypass card network interchange entirely by settling directly between bank accounts, though often at the cost of a less familiar checkout experience for customers.

Pricing Models: Blended vs Interchange++

Merchants typically encounter one of two main pricing structures from their acquirer. A blended rate charges a single flat percentage across all transactions regardless of the underlying interchange, scheme fee, and acquirer markup — simple to budget for, but it hides the true cost mix and often works out more expensive for merchants with a favourable transaction profile (e.g. mostly in-person debit transactions, which carry lower interchange). Interchange++ pricing instead passes through the actual interchange fee and scheme fee for each transaction, with the acquirer's markup shown as a separate, transparent third component. Larger merchants with meaningful transaction volumes generally negotiate interchange++ pricing specifically because it lets finance teams see and manage the real cost drivers, rather than accepting whatever blended rate the acquirer proposes.

FAQ

Who actually receives the interchange fee?
The cardholder's issuing bank receives it, paid by the merchant's acquiring bank, even though the merchant ultimately bears the cost through their overall card processing fees.

Is interchange the same as the merchant service charge?
No. Interchange is one component of the total cost a merchant pays to accept cards; the acquirer and card scheme also add their own fees (scheme fees and acquirer markup) on top, making up the full merchant service charge.

Why do online transactions often cost merchants more in interchange?
Card-not-present transactions carry greater fraud risk than in-person chip and PIN payments, and card networks price interchange higher for that category to reflect the increased risk the issuer is taking on.

Understanding payment economics and emerging alternatives like open banking payment rails is part of the broader fintech literacy covered across Learnsignal's CPD course content for finance professionals.