The average card machine fee for a UK small business sits between 1.4% and 1.75% per transaction all-in - that's the honest headline. But 'average' hides a huge spread: a supermarket pays a fraction of a percent while a market stall pays 1.69%, and both are getting a fair deal for their size. Here's what normal looks like at your scale, and the actual warning signs that yours is too high.
The benchmark numbers by business size
What UK businesses typically pay per card-present transaction, all-in:
- Micro/small (readers, no contract): 1.4%-1.75% flat - SumUp's 1.69% and Square's 1.75% are the reference points.
- Small-to-medium on negotiated deals: roughly 0.9%-1.4% blended, plus monthly fees - the Dojo/acquirer territory.
- Larger merchants on interchange-plus pricing: often under 0.8% all-in, because they pay the wholesale costs plus a thin margin.
- Online payments run higher than in-person everywhere - typically 1.9%-2.5% for small businesses - because fraud risk prices in.
Where the money actually goes
Every card fee splits three ways. Interchange goes to the customer's bank - and it's capped by UK regulation at 0.2% for consumer debit and 0.3% for consumer credit. Scheme fees go to Visa or Mastercard. Everything above that is the acquirer's margin - the only negotiable part, and the part that varies wildly between providers.
That's why the flat 1.69% is honest but not cheap: on a £20 debit payment the regulated wholesale cost is pennies, and the flat rate bundles convenience, hardware subsidy and profit into one number. At low volume that bundle is worth it; at high volume you're overpaying for simplicity - which is the entire logic of when to switch pricing models.
The signs your fees are actually high
Forget the headline rate - these are the real red flags on a statement:
- Your all-in cost (total fees / total card sales) is above 1.8% for in-person payments at any meaningful volume.
- Fixed monthly charges - rental, PCI, minimum service charges - add more than 0.3% to your effective rate.
- Your negotiated rate has quietly drifted upward at 'review' since you signed.
- You're paying PCI non-compliance fees - pure penalty, fixable in ten minutes.
Find your own number in a minute
Averages are a sanity check, not a target - the number that matters is your effective rate at your turnover. Take last month's statement, divide total fees by total card sales, and compare it against what the fee calculator says the best-fit provider would charge at the same volume.
If the gap is more than a few tenths of a percent, that's real money: 0.3% on £8,000 a month is nearly £300 a year. Our guide on cutting card processing fees covers the negotiation script from there.
FAQs
What is the average card transaction fee in the UK?
For small businesses taking payments in person: 1.4%-1.75% all-in on flat-rate providers, less on negotiated deals at volume. Large retailers pay well under 1% because they buy at close to the regulated wholesale costs.
Why do small businesses pay more than supermarkets?
Interchange is capped for everyone (0.2%-0.3% on consumer cards), but small merchants pay a bigger acquirer margin per transaction - flat-rate pricing bundles hardware, risk and simplicity into the rate. Volume is the lever that unbundles it.
Is 1.75% a good rate for a card machine?
For a low-volume business with no monthly fees, yes - it's the fair market rate for pay-as-you-go. Once you're doing £10k+ a month on cards, you can usually beat it with a negotiated deal - run your numbers to find your crossover.
