Card processing fees: what taking a payment really costs your margin

Card fees are the most reliably ignored cost in retail and hospitality. They arrive as a single deduction, they look small as a percentage, and the statement explaining them is written to be difficult. So the direct debit goes out every month and nobody looks, which is precisely the business model.

Look properly and two things become clear. Most of what you pay is set by rules nobody can change. The rest is a margin somebody chose, and it is far more negotiable than the sales call suggested.

The three layers inside every card fee

Interchange goes to the customer's bank. In the UK, domestic consumer interchange is capped by law at 0.2% for debit cards and 0.3% for credit cards, and has been since the Interchange Fee Regulation took effect in 2015. No provider can beat this, because no provider keeps it. Commercial and corporate cards sit outside the cap and cost considerably more, which is why a B2B business often sees a higher blended rate than a café with identical volume.

Scheme fees go to Visa and Mastercard. Numerous, opaque, and rising — this is the layer that has grown most in recent years and the one your provider will happily blame for an increase.

Acquirer margin is what your provider keeps. This is the only part that is genuinely up for negotiation, and it is where the difference between a good and a bad deal lives.

One more layer applies if you sell online across borders. Interchange on UK-EEA card-not-present transactions was raised by the schemes to 1.15% for debit and 1.5% for credit after Brexit, and the Payment Systems Regulator concluded those increases were not justified by competition. Visa, Mastercard and Revolut challenged the regulator's power to cap them and lost in the High Court in January 2026. If you sell to European consumers online, this line is worth watching.

Interchange is the law. Scheme fees are the schemes. Everything left on your statement is a decision your provider made about how much to charge you, and decisions can be revisited.

Blended, IC++, and why the cheap headline rate is not cheap

Blended pricing gives you a single rate on everything — say 1.6% — regardless of whether the customer tapped a debit card that cost 0.2% in interchange or presented a corporate credit card that cost far more. It is simple, and simplicity is priced.

IC++ pricing passes interchange and scheme fees through at cost and adds a stated margin on top. It produces a longer statement and, for most businesses with a normal card mix, a materially lower total. The transparency is the point: with IC++ you can see the acquirer's margin as a number, which is exactly why blended pricing remains popular with providers.

Then there are the extras that never appear in the headline rate: terminal rental, minimum monthly service charges, PCI compliance fees, non-compliance fees where you have not completed a questionnaire nobody told you about, authorisation fees of a few pence per transaction, chargeback fees, and early termination charges on a contract you do not remember agreeing to for four years.

Putting real numbers on it

Take an illustrative café turning over £25,000 a month on cards, mostly contactless debit, with an average transaction of £8.

On a blended 1.6% that is £400 a month, or £4,800 a year. Add £25 a month terminal rental, a £15 PCI fee and around 3p per transaction authorisation on roughly 3,125 transactions — about £94 — and the real annual cost is closer to £6,400.

Now price the same volume properly. With debit interchange at 0.2% and scheme fees on top, a competitive IC++ deal for that card mix could plausibly land near a 0.9% to 1.1% effective rate. At 1.0% the same £25,000 a month costs £250, or £3,000 a year. Even keeping every ancillary fee, that is roughly £1,700 a year back, on a business where net margin is measured in single-digit percentages. It is the equivalent of several hundred extra covers, achieved by making two phone calls.

The same discipline applies to every recurring line in the business, which is the point made in the subscription trap: small percentages on large volumes are where margin quietly leaves.

The five-minute audit

Find last month's merchant statement — the real one from the acquirer, not the summary in your till app. Work out the effective rate: total fees divided by total card turnover. That single number is the only one that matters, and it is usually higher than the rate you believe you are on.

Then list every fixed charge, check your contract end date and notice period, and check whether you own or rent the terminal. Rented terminals on rolling agreements are where the worst value sits.

Negotiating, and the mistakes to avoid

Providers price on churn risk, so the leverage is real and immediate. Get two competing quotes on IC++ terms, ask your current provider to match on effective rate rather than headline rate, and ask specifically for the ancillary fees to be waived rather than the percentage shaved — a 0.05% reduction is worth less than losing a £25 monthly terminal rental at this volume.

Two things to avoid. Surcharging consumers for using a card is banned in the UK, so recovering the cost that way is not an option. And a minimum spend for card payments, while not unlawful, quietly costs more in abandoned sales than the fees it saves in most food and retail settings — the arithmetic of which belongs in the same conversation as how you price for profit rather than being treated as a fees decision at all.

Common questions

What is a good card processing rate for a UK small business?

Judge it by effective rate, not headline rate: total monthly fees divided by total card turnover. For a typical face-to-face retail or hospitality business taking mostly UK consumer debit cards, an effective rate above roughly 1.5% suggests you are paying well over the odds, because domestic debit interchange is capped at 0.2% and everything above that is scheme fees plus your provider's margin. Online businesses and those taking a high proportion of commercial or international cards will legitimately sit higher, since those cards fall outside the interchange caps. Always compare effective rates including terminal rental, PCI charges and authorisation fees, not the percentage on the quote.

Can I charge customers extra for paying by card?

No. Surcharging consumers for paying by debit or credit card has been prohibited in the UK since 2018, and that ban covers the great majority of retail and hospitality transactions. You cannot add a card fee at the till or a percentage at checkout for consumer payments. Some limited surcharging remains possible on certain commercial card transactions between businesses, but it is a narrow exception and not a route out of the cost for a shop or a café. The practical alternatives are to negotiate the fees down and to build the true cost of accepting payment into your prices across the board.

Is it worth switching card payment providers?

Usually yes, and the biggest saving often comes from renegotiating rather than moving. Get two quotes on IC++ terms, work out the effective rate each would produce on your actual card mix, then take them to your current provider — retention teams have far more room than the original salesperson did. Before signing anything, check the contract length, the notice period, whether the terminal is rented or owned, and any early termination charge on your existing agreement, which can be substantial on long hardware contracts. Switching is rarely worth it for a headline rate alone; it is worth it when the fixed monthly charges go too.

Why did my card fees go up when nobody told me?

Most merchant agreements permit the provider to pass through increases in scheme fees, and Visa and Mastercard have raised those repeatedly. Providers are generally required to notify you, but notification often means a line in a monthly statement rather than a conversation. Blended pricing hides this completely, because your headline rate stays the same while the margin inside it changes. This is the strongest practical argument for IC++ pricing: pass-through costs and your provider's margin appear as separate figures, so an increase is visible and attributable. Check your effective rate every six months and treat an unexplained rise as a prompt to renegotiate.