Cardholder
Uses a debit or credit card to pay.
Card payment economics, made clear
What are MIFs?
Multilateral interchange fees are a component of the cost of accepting many card payments. They usually move from the merchant’s payment provider to the customer’s card issuer, behind the scenes, whenever a transaction is processed.
Follow a card payment01
Small percentage.
Material cost.
MIFs are easy to overlook because businesses do not normally receive a separate interchange invoice. Instead, the fee sits within the wider economics of card acceptance and may be included in, or passed through as part of, the merchant service charge.
For finance directors, controllers and managers, the useful question is not simply “what rate do we pay?” It is how the total card cost is constructed, which transactions attract which fees, and whether the reporting available from the acquirer provides enough detail to analyse them.
02
How a card payment moves
The customer sees one payment. Behind it is a four-party model, with separate commercial relationships and fee flows.
Merchant
Accepts the card payment for goods or services.
Acquirer
Provides card acceptance services to the merchant.
Issuer
Provides the card and account to the cardholder.
Interchange fee
Usually paid by the acquirer to the issuer for the transaction
The card scheme provides the network and rules connecting participants. Three-party arrangements and some American Express transactions operate differently.
03
One fee is not the whole fee
The merchant’s cost of accepting a card can contain several layers. These terms should not be used interchangeably.
Interchange fee
Paid between payment service providers, generally from the merchant’s acquirer to the cardholder’s issuer.
Scheme and processing fees
Charges associated with use of the card network and the authorisation, clearing and settlement of payments.
Acquirer charge
The payment provider’s own commercial charge for delivering card acceptance and related services.
A+B+C=Merchant service charge
This is a simplified illustration. Contract structures and terminology vary between providers.
04
The UK regulatory picture
Under the UK Interchange Fee Regulation, certain UK consumer card transactions are subject to caps. Broadly, the merchant, acquirer and issuer must all be within the UK for the domestic caps to apply.
Commercial cards, cash withdrawals and transactions where an acquirer or issuer is outside the UK may fall outside those caps. The precise treatment depends on the card and transaction circumstances.
Read the Payment Systems Regulator’s IFR guidanceWhere the UK caps apply
0.2%Consumer debit and prepaid cards
0.3%Consumer credit cards
For an eligible £100 transaction, that illustrates a maximum interchange amount of 20p or 30p respectively. It does not represent the merchant’s total cost of accepting the payment.
05
What finance teams should look for
- 01
Pricing model
Identify whether the acquirer applies blended, interchange-plus or interchange-plus-plus pricing.
- 02
Transaction mix
Review debit, credit, commercial, premium and overseas-issued card volumes separately.
- 03
Fee visibility
Check whether statements expose interchange, scheme and provider charges clearly enough to reconcile.
- 04
Effective rate
Compare total card acceptance cost with processed value, while allowing for fixed and non-transactional charges.
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Common questions
Who sets a MIF?
Interchange rates are commonly established through the rules of a card scheme. The UK regulatory framework places caps on certain consumer card transactions and includes business rules governing the market.
Does the merchant pay the MIF directly?
The interchange fee is generally paid by the acquirer to the issuer. The acquirer may pass that cost to the merchant through the merchant service charge, either transparently or within a blended price.
Are all interchange fees capped?
No. The UK caps apply to specified consumer transactions where the relevant parties are within the UK. Commercial cards and transactions involving an issuer or acquirer outside the UK can sit outside those caps.
Is interchange the same as a scheme fee?
No. Interchange is an inter-provider payment, generally from acquirer to issuer. Scheme and processing fees are separate charges connected with the card network and payment processing.
Why do MIFs matter to a finance team?
Even a small per-transaction percentage can aggregate into a material annual cost at scale. Understanding the components also makes provider comparisons, reconciliation and forecasting more meaningful.