Mastercard

 

Mastercard is one of the two dominant global card networks alongside Visa, operating in over 210 countries and territories and processing billions of transactions annually across credit, debit, prepaid, and commercial card products. For merchants, Mastercard acceptance is a non-negotiable baseline: it is expected at every checkout globally and any gap in acceptance is an immediate conversion risk.

Understanding what Mastercard acceptance actually costs, and where that cost comes from, is where the commercial substance lies for merchants. The total cost of a Mastercard transaction is composed of three layers: interchange paid to the card-issuing bank, scheme fees charged by Mastercard itself, and the acquirer’s or PSP’s own margin. Merchants see the aggregate of all three as their merchant discount rate, but on interchange-plus pricing, each component is visible separately, which enables genuine cost analysis and optimisation.

In the EEA, consumer Mastercard credit card interchange is capped at 0.3% per transaction under the EU Interchange Fee Regulation. Consumer debit is capped at 0.2%. These caps apply to domestic and intra-EEA transactions where both the issuing and acquiring banks are within the European Economic Area. Mastercard scheme fees add approximately 0.12% on top. The acquirer’s margin is the negotiable component, and this is where PSP contract terms and pricing models have the most direct impact on what merchants actually pay.

Commercial Mastercard cards, issued to businesses, are not subject to the IFR interchange cap. Commercial card interchange is significantly higher and varies by card product, merchant category, and transaction type. For merchants in B2B categories, or any merchant who processes a mixed portfolio of consumer and commercial cards, the commercial card interchange exposure is a meaningful cost line that tends to be underweighted in payment cost analysis.

Cross-border transactions, where the card is issued outside the EEA, also fall outside the IFR cap. This is particularly relevant for UK merchants accepting EEA-issued cards since Brexit, where Mastercard raised cross-border card-not-present interchange to 1.5% for credit and 1.15% for debit. The UK Payment Systems Regulator has been reviewing this and proposed a cap, but legal proceedings have delayed implementation. The UK Competition Appeal Tribunal ruled in June 2025 that Mastercard’s default interchange fee structures breach competition law, a landmark finding that both Mastercard and Visa are appealing.

In the US, a class action settlement announced in late 2025, if approved, could reduce published interchange rates by 0.1 percentage points and cap standard consumer credit rates at 1.25% for eight years. This would be the most significant structural change to US card interchange in many years and is worth monitoring for any merchant with material US card volume.

Mastercard introduced several operational changes in the second half of 2025, including mandatory refund authorisations for card-not-present transactions from October 2025, a new InControl clearing programme from July 2025 requiring MCC codes and transaction amounts to match between authorisation and clearing, and an increase to the Transaction Processing Excellence Fee for transactions submitted with undefined merchant category codes. These are compliance and operational requirements that PSPs should be managing, but merchants on interchange-plus pricing may see these reflected in their statements and should verify how their provider is passing them through.

PSP support for Mastercard is universal. The relevant commercial questions are pricing model, acquirer margin, and whether the PSP’s scheme fee passthrough is transparent.

Relevant markets: Global