Accepting Mastercard as a merchant

Mastercard, like Visa, is a four-party scheme. It sets the rules and runs the network but does not contract with you. Your acquirer does, and your price is interchange plus scheme fees plus acquirer markup. Knowing which of those three moved when your rate changed is the difference between managing cost and receiving it.

How your Mastercard rate is built

Interchange goes to the issuing bank and is capped in regulated markets. Scheme fees go to Mastercard, are not capped, and have grown as a proportion of total acceptance cost over the past decade. Acquirer markup is your provider’s margin and the only genuinely negotiable component. Under blended pricing all three are invisible, which is convenient for exactly one party in the relationship.

Interchange

What the interchange cap actually covers

Interchange on a consumer credit card issued in the EEA is capped at 0.3 per cent of the transaction value, and on a consumer debit card at 0.2 per cent. Those two numbers come from Regulation (EU) 2015/751, and they are why a European consumer card rate looks the way it does.

What the cap does not cover matters more. The regulation excludes commercial cards, cash withdrawals, and cards issued by three party schemes. A commercial card is one issued to a company, a public sector body or a self-employed person and limited to business expenses, and interchange on it is set by the scheme rather than by the regulation.

So whatever share of your volume arrives on business cards is carrying uncapped interchange. In a consumer business that share is noise. In a business selling to businesses it is the largest single variable in the rate, and it is precisely what a blended invoice reporting one number makes impossible to see.

The Maestro migration is still moving your volume

Mastercard stopped issuing Maestro in Europe from 1 July 2023, with existing cards running to expiry and 2027 as the outside date. Volume has been shifting to Debit Mastercard continuously since. If your rate card prices the two differently, your effective cost has been changing for three years without a contract amendment and without notification. Checking that is a straightforward comparison and very few merchants have run it.

Debit and credit are not one rate

Your effective Mastercard cost depends heavily on your debit-to-credit mix, which follows from your customer base rather than from any decision you make. Under pass-through, a debit-heavy business pays debit economics. Under a blend it pays an average weighted towards credit it may barely see. That gap is the single most common structural overpayment in card acceptance.

Surcharging

What you may charge for, and what you may not

The surcharging ban and the interchange cap are drawn along the same line. Article 62(4) of PSD2 stops you charging for the use of any payment instrument whose interchange is regulated under the Interchange Fee Regulation, and for the transfers and direct debits covered by Regulation 260/2012. Consumer Mastercard and Visa cards issued in the EEA sit squarely inside that.

Outside it sit the same instruments the cap misses: commercial cards, and three party schemes such as American Express and Diners Club. Article 62(4) does not reach them. Article 62(5) then allows each member state to prohibit or limit surcharging further, and several have, so this is a national answer to be checked per market rather than a European one to be assumed.

The right the same article gives you is worth more than the one it removes. Article 62(3) stops your provider preventing you from steering a customer towards a given instrument, or offering a reduction for using it. Presentation order, default selection and a discount are yours to set, and they move payment mix faster and more quietly than a surcharge does.

Australia: what changes on 1 October 2026

The RBA Conclusions Paper of 31 March 2026 removes surcharging on eftpos, Mastercard and Visa from 1 October 2026, lowers domestic interchange caps, introduces caps on interchange for foreign cards and requires networks and large acquirers to publish their fees. Australian merchants lose the ability to recover acceptance cost from customers on that date.

Liability

A card dispute gives you a defence, which most rails do not

When a cardholder disputes a transaction the issuer returns it to your acquirer, Mastercard moves the money automatically, and the acquirer is debited. At that first stage the loss sits on the acquiring side of the chain, which in practice means with you.

What follows has no equivalent on a bank rail. At second presentment your acquirer can reject the chargeback with documentation setting out why, and if that stands the funds move back. The issuer may escalate to pre-arbitration and then to arbitration, where the acquiring side has ten calendar days to respond before the case passes to Mastercard to decide on its merits.

That is a real process with a real burden of proof, and it rewards merchants who hold delivery evidence, authentication records and terms in a form that can be produced quickly. It is also the sharpest contrast with a direct debit, where inside the refund window the money simply goes back and nobody asks you for anything.

Authentication

Who carries the loss when authentication is skipped

Strong customer authentication is not only a compliance step. It decides who pays for fraud. Article 74(2) of PSD2 puts it plainly: where the payee or the payment service provider of the payee fails to accept strong customer authentication, it shall refund the financial damage caused to the payer’s payment service provider.

Exemptions are where that becomes expensive. The European Banking Authority has confirmed that the cardholder’s own bank stays liable to the cardholder for an unauthorised transaction, but that where the acquiring side invokes an exemption and the transaction goes through unauthenticated, the acquiring side carries the loss towards the issuing side.

That is the calculation sitting behind every exemption. Transaction risk analysis and low value exemptions lift conversion by removing a step, and they move the fraud loss onto the party that removed it. Whether the trade is worth making is a number rather than a preference, and it comes out of your own authentication and fraud data.

Which payment provider supports Mastercard?

Adyen, Checkout.com, Stripe, Worldpay, Braintree, Computop and Mollie all document Mastercard acceptance, among others, as does every acquirer in the market, so availability tells you nothing. The useful questions are whether debit and credit are priced separately, whether interchange and scheme fees reach you as pass-through or as a blend, and what share of your volume sits on the consumer credit rates that carry the highest interchange.

Reviewing what card acceptance costs you

What you pay is set in your acquiring contract, not by the scheme. Start by establishing whether you are overpaying your PSP, or move straight to cutting your PSP costs, where interchange, scheme fees and markup are separated before anything is negotiated.

Relevant markets: global