Most UK small businesses pay somewhere between roughly 0.5% and 2.5% of every card transaction to accept it, plus a mix of fixed fees, monthly charges and hardware costs that quietly push the real number higher. The headline rate a salesperson quotes is almost never what lands on your statement, because it usually reflects the cheapest card type in the best circumstances. Your true cost is your effective rate: total card fees for the month divided by total card turnover for the month.
To take control of card payment fees UK owners need to understand three things: how a single transaction is actually priced, why blended pricing usually costs more than it looks, and where the contract traps sit. Get those right and most businesses can trim their card machine costs meaningfully without changing how they trade. This guide walks through all of it, with approximate figures that are correct at the time of writing and can change.
How a card transaction is actually priced
Every card payment you take is split three ways. Understanding the split matters because only one part is genuinely up for negotiation.
The interchange fee
This goes to the bank that issued your customer’s card. It is capped by regulation in the UK for most consumer cards: roughly 0.2% on consumer debit and roughly 0.3% on consumer credit for UK domestic transactions. Your payment provider does not keep this and cannot discount it. It is a fixed input cost that applies to everyone.
The scheme fee
This goes to the card network, meaning Visa or Mastercard, for running the rails your payment travels down. Scheme fees are small per transaction but numerous and complex, and they are not negotiable by you. Like interchange, your provider passes them through.
The acquirer margin
This is the slice your payment provider (the acquirer) keeps for processing the payment, settling the money and carrying the risk. It is the only part that is genuinely negotiable. When someone offers you a “better rate”, they are almost always moving this margin, not the interchange or scheme fees underneath it.
The practical takeaway: when you compare quotes, you are really comparing acquirer margins bolted onto identical underlying costs. That is why comparing on effective rate, not headline rate, is the only fair test.
Interchange plus versus blended pricing
There are two main ways providers price the whole thing, and the difference can cost or save you real money.
Interchange plus shows you the three parts separately: interchange at cost, scheme fees at cost, and the acquirer’s margin stated openly on top, for example “interchange plus 0.3% plus 2p”. It is transparent, and on a mixed book of cards it usually works out cheaper because you pay the true cost of each card rather than an averaged-up rate. The downside is that statements look complicated.
Blended or fixed rate pricing charges one flat percentage for every card, for example 1.6% across the board, sometimes with a separate higher rate for premium and commercial cards. It is simpler to read and easier to forecast. The catch is that the flat rate has to cover the provider’s risk on the expensive cards too, so on your cheap consumer debit transactions you are usually overpaying to subsidise the average.
Blended pricing suits very low volumes and businesses that value predictability over the last few pounds. Once you are processing meaningful monthly card turnover, interchange plus almost always wins, and it is worth asking for.
How to work out your real effective rate
Do not trust the number you were sold. Do this instead, using one recent monthly statement.
- Find your total card turnover for the month (the gross value of card sales).
- Add up every card-related charge on the statement: transaction fees, authorisation fees, scheme fees, PCI fees, minimum monthly service charges, terminal rental, and any “non-compliance” charges.
- Divide total charges by total turnover, then multiply by 100.
If you turned over £20,000 on cards and paid £360 in total charges, your effective rate is 1.8%, whatever the headline said. Run this for two or three months so seasonal card mix does not skew it. This single number is the only fair basis for comparing providers, and building it into your rolling 13-week cash flow forecast keeps the cost visible rather than buried.
The cost differences that catch people out
Not all cards cost the same, and the gap can be large. These are the ones that surprise owners.
Debit versus credit versus commercial
Consumer debit is the cheapest to accept. Consumer credit costs a little more. Commercial cards, meaning business and corporate cards, sit outside the regulated interchange caps and can cost several times more per transaction. If you sell business to business, or take a lot of company cards, your effective rate will run higher than a coffee shop’s, and a flat blended rate can hurt you here.
Cards issued outside the UK and EEA
When a tourist or overseas customer pays with a card issued outside the UK and the European Economic Area, interchange caps do not apply, and both interchange and scheme fees jump. A business with many international customers will see a higher blended cost regardless of provider.
Card not present transactions
Payments where the card is not physically tapped or inserted, including online checkouts, payment links, phone orders and invoices, are classed as card not present. They carry more fraud risk, so they usually cost more than face-to-face payments and are more exposed to chargebacks. If you are moving sales online, factor this in when you compare an ecommerce platform’s built-in payments against a standalone gateway.
How UK businesses take payment and what each really costs
The method you choose shapes both your fees and your cash flow. Here is the honest picture. All figures are approximate and subject to change.
| Method | Typical cost shape | Settlement | Hardware | Best for |
|---|---|---|---|---|
| Countertop or portable terminal | Roughly 0.5% to 1.75% per transaction, often plus monthly rental and PCI fees | 1 to 3 working days | Rented or bought; buying avoids lease traps | Shops, salons, hospitality with steady footfall |
| Mobile card reader | Flat blended rate, commonly around 1.5% to 1.75%, no monthly fee | 1 to 3 working days | One-off device, roughly £30 to £70 | Market traders, mobile services, low or variable volume |
| Ecommerce gateway | Roughly 1.4% plus around 20p per transaction; higher for non-UK cards | 2 to 7 working days | None; integration or plugin | Online shops and subscription sellers |
| Payment links and invoicing | Card not present rate, often around 1.5% to 2.5% plus a fixed fee | 2 to 5 working days | None; sent by email or text | Trades, consultants, remote and phone sales |
| Pay by bank (open banking) | Low flat fee, often a few pence to under 1% | Often near instant | None | Higher-value invoices where the fee gap matters |
Pay by bank, built on open banking, moves money directly from the customer’s bank account rather than over the card networks, so it sidesteps interchange and scheme fees entirely. It is cheaper and settles fast, but the customer journey is less familiar and there is no card-style chargeback protection for the buyer, so uptake varies. It is worth offering on larger invoices where the saving is material. If you invoice regularly, pairing it with invoice automation can cut both fees and admin.
The contract traps that cost small businesses most
This is where the money quietly leaks. The transaction rate is only part of the deal.
- Long terminal leases. Terminal rental is often sold on a separate agreement, sometimes with a third-party finance company, on terms of up to 48 months. These are frequently non-cancellable, so you keep paying even if you leave the payment provider. Buying a reader outright, or choosing a no-contract mobile device, avoids this entirely.
- PCI compliance fees and non-compliance charges. PCI DSS is the card industry’s security standard. Staying compliant is reasonable, but many providers charge a monthly PCI fee and a larger monthly “non-compliance” penalty if you do not complete an annual self-assessment questionnaire. Complete it and the penalty disappears.
- Minimum monthly service charges. If your fees do not reach a set floor, you are billed the difference. Seasonal and low-volume businesses can pay for card processing in months they barely used it.
- Authorisation fees. A small fee, often around 1p to 5p, charged per authorisation attempt, including some declined ones. On high volumes of low-value sales this adds up.
- Early termination penalties. Leaving before the minimum term can trigger a charge. Always ask for the minimum term and the exit cost in writing before you sign.
Keeping your card processing sensible alongside your business bank account and other core finance tools stops these small recurring charges compounding across the year.
Surcharging: what you can and cannot pass on
You cannot add a surcharge to consumer debit or consumer credit card payments in the UK. This has been the law since the ban on excessive card surcharges took effect, and the government’s guidance on payment surcharges sets out what is prohibited. Charging a customer 50p or 2% simply for paying by consumer card is not allowed.
There are narrow exceptions. Surcharges on some commercial cards may still be permitted, and a genuine, separately itemised service charge is different from a card surcharge. If you want to reflect card costs, the cleaner and lawful route for most retailers is to build the average cost into your prices for everyone, rather than adding a card fee at the till. If in doubt, take advice before applying any surcharge, because getting it wrong risks complaints and enforcement.
Chargebacks and how to reduce them
A chargeback happens when a cardholder disputes a payment through their bank, for example claiming fraud or non-delivery. The money is pulled from your account while it is investigated, and most providers charge a chargeback fee of roughly £10 to £25 that you pay whether or not you win the dispute. Lose enough of them and providers can classify you as high risk and raise your rates.
Reduce them with practical habits: describe your business clearly on statements so customers recognise the charge, keep proof of delivery and clear records, respond to disputes quickly with evidence, and use address and card verification checks online. For card not present sales, a short, well-run online store security routine catches fraud patterns before they turn into disputes.
Negotiating your rate and switching provider
Card rates are negotiable once you are past modest volumes, and providers expect it. Take two or three months of statements, calculate your effective rate, and ask competing providers to quote against your actual card mix, not a headline. Push for interchange plus so the margin is visible, ask for the terminal to be bought rather than leased, and get the minimum term, PCI charges and exit fees confirmed in writing.
Switching is usually straightforward. Most providers port your setup within days, and mobile readers and gateways can be running the same day. The friction to watch for is a separate terminal lease that outlives the payment contract, so confirm hardware ownership before you move. Even a 0.3% cut on £250,000 of annual card turnover is £750 a year for a phone call and some paperwork.
The mistakes people actually make
- Comparing headline rates. The advertised rate reflects the cheapest card in ideal conditions. Compare effective rates only.
- Ignoring the fixed fees. A brilliant transaction rate wrapped in monthly minimums, PCI penalties and terminal rental can cost more than a plainer deal.
- Signing a long terminal lease. Buying a reader outright is cheaper over any reasonable period and leaves you free to switch.
- Never rerunning the numbers. Your card mix drifts as your customers change. Recalculate your effective rate once a year.
- Forgetting VAT on the fees. Card processing fees can carry VAT implications depending on your setup and scheme; check where you stand as part of your VAT and scheme decisions.
Frequently asked questions
Why is the rate on my statement higher than the one I was quoted?
Because the quote almost always reflects consumer debit in the best case, while your real customers use a mix of credit, commercial and sometimes overseas cards that cost more. Add fixed fees like PCI charges, authorisation fees and monthly minimums and your effective rate climbs further. Always judge a deal on the effective rate from a real statement.
Can I pass card fees on to my customers?
Not on consumer debit or credit cards. UK law bans surcharging consumer card payments, so adding a fee at the till for those is not allowed. You can reflect costs by building them into your prices for everyone, and limited exceptions exist for some commercial cards, but take advice before applying any surcharge.
What happens to the fee when I refund a customer?
You return the full amount to the customer, but you usually do not get the original processing fee back, and some providers add a small refund fee on top. In effect a refunded sale can cost you twice. This is another reason to keep chargebacks and returns low.
How quickly does the money actually reach my account?
For most card machines and readers, funds settle in one to three working days. Ecommerce gateways can take two to seven, and some hold an initial rolling reserve for new or higher-risk accounts. Pay by bank is often near instant, which is why it helps cash flow on larger invoices.
Is a flat-rate mobile reader or a full merchant account better for me?
A flat-rate mobile reader with no monthly fee suits low or variable volumes and anyone who wants zero contract risk. Once you process steady monthly turnover, a merchant account on interchange plus usually gives a lower effective rate, provided you avoid the leasing and minimum-charge traps. Run your own numbers rather than assuming.
What to do next
- Pull your last three monthly statements and calculate your effective rate for each: total card charges divided by total card turnover, times 100. This is your baseline.
- List every fixed charge on the statement, then check your contract for the minimum term, PCI fees, monthly minimum and any terminal lease. Flag anything non-cancellable.
- Ask two or three providers to quote interchange plus against your actual card mix, with the terminal bought not leased, and every fee confirmed in writing. Compare on effective rate only.
- Offer pay by bank on higher-value invoices to cut fees where it makes sense, and diarise a rate review once a year so the cost never drifts unchecked.
For a wider view of how card fees, banking and open banking fit together, the Payment Systems Regulator’s market reviews of card fees set out how the UK system is priced and where the regulator is pressing for change.
