Buyer's guide · Card payments
The best card machine for a small business in the UK (2026).
Short version: there isn't one. The right card machine depends on how you trade, not on whoever ranks first on Google.
I don't sell one provider, so I can tell you the truth about all of them. Here's how to actually choose, then my picks by scenario.
Last reviewed: 7 June 2026
There is no single best card machine for a small UK business. The right one depends on how you trade, so this guide gives you the criteria that matter, then my picks for four common setups.
Card payments now account for 64% of all UK transactions (UK Finance, UK Payment Markets 2025). So for almost every small business, the card machine you pick isn't a side decision. It's the till.
One thing first. I make money the same whether or not you choose any given provider. No affiliate links, no kickbacks, no commission on a sign-up. That's the whole point of reading this instead of a comparison portal.
Why the default deal is rarely the best one
Most traders take the first quote. That's where the money leaks.
In a single year, UK businesses paid an extra £150 to £200 million because of card fee increases, according to the Payment Systems Regulator. Card fees have risen by around 25% since 2017, with rising and often unclear fees hitting small businesses hardest (PSR market review MR22/1.10).
Here's the thing. Most of that isn't fraud or bad luck. It's people accepting the first deal a rep waved under their nose, never reading the small print, and never reviewing it once the business grew. The comparison sites won't fix that for you. They earn when you sign up to one of their listed providers, so they're pointing you somewhere, not telling you what's actually right.
How to actually choose
Six things that matter more than the headline rate.
With a card reader or POS terminal, UK small businesses typically pay somewhere between 1.5% and 3.5% per card transaction (SumUp payment-fees guide, updated 19 Dec 2025). That's a wide range. Where you land inside it has almost nothing to do with the number on the front of the brochure, and everything to do with these.
1. Total cost, not the rate
A 1.4% rate looks great until you add terminal rental, a minimum monthly charge, authorisation fees and PCI fees. Add it all up over a year. That's your real number.
2. Monthly vs pay-as-you-go
Roughly speaking, under about £2,000 a month in card sales, pay-as-you-go wins. Above it, a monthly plan with a lower per-transaction rate usually works out cheaper.
3. Settlement speed
When does the money land? Next day, or three days later? If cash flow is tight, a day or two matters more than a fraction of a percent on the fee.
4. Connectivity
A reader is useless with no signal. If you're rural, you want 4G built in, and for some sites a fixed line, dual SIM, or even Starlink for the wet-led pub in a notspot.
5. Contract length
Avoid long lock-ins where you can. A four-year terminal rental is a trap if you outgrow it in year two. Short terms keep you free to move.
6. It must talk to your till
If your card machine and your EPOS don't speak to each other, your staff key every sale twice. That's errors, slow service and a reconciliation headache every night.
Honest picks by scenario
Not one winner. Four real setups.
A market trader and a community pub have almost nothing in common at the till. So picking one "best card machine for small business" and stamping it on everyone is lazy advice. Here's what I'd actually fit for four setups I see all the time. These are pointers, not paid placements.
Sole trader & market trader
My pick: SumUp Air or Square ReaderIf you're a one-person stall, a hairdresser, a window cleaner, or you do a few hundred pounds in card sales a month, keep it simple and keep it pay-as-you-go. A SumUp Air or a Square Reader costs little up front, charges a flat percentage, and bills you nothing in a quiet week.
No contract. No monthly fee. The phone in your pocket is the brains, the little reader does the tap. For the cheapest way into card payments at low volume, this is it. Both providers sit around the same flat rate, so choose on the app you prefer. (More on the SumUp vs Square question in the FAQ below.)
Cafe & coffee shop
My pick: countertop terminal with a printerA cafe is a different animal. You've got a counter, a queue at 8am, and you want one tidy box that takes the payment, prints a receipt and keeps the line moving. A countertop unit like the Square Terminal does the job, and it grows with you into a fuller EPOS and payments setup if you add tables or online ordering.
Once your card sales climb past a couple of thousand a month, get someone to run the numbers on a monthly merchant plan against pay-as-you-go. The lower rate can pay for the monthly fee several times over.
Community & wet-led pub
My specialismThis is the one I've spent 40 years on. A busy pub isn't about the reader at all. It's about the card machine being properly tied into your EPOS and stock system, so a round of drinks, a meal and a tab all reconcile cleanly at the end of a packed Saturday.
Connectivity is where pubs get burned. A reader that drops out mid-service in a village notspot will cost you far more than a few extra pence per transaction. For rural sites I'll look at 4G backup, dual SIM, fixed line, or Starlink before I worry about the rate.
There's no off-the-shelf "best" here. It depends on your cellar, your kitchen and your broadband. (If you want the bigger picture on why proper pubs are worth getting right, I wrote about that in why community pubs still matter.)
Mobile trader & pop-up
My pick: a 4G reader, myPOS Go 2 or TideFood van, festival pitch, mobile barber, event caterer? You can't rely on someone else's WiFi, and you definitely can't rely on your customer's phone hotspot. You want a reader with its own 4G SIM so it works wherever you park up.
Something like the myPOS Go 2 or a Tide reader gives you a standalone unit with mobile data built in, so it stands on its own without a phone. Check the data is included and not a surprise add-on, and check how fast the money settles, because a mobile trader lives on cash flow.
Not sure which fits your setup?
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The bottom line
Pick for how you trade, then review it every year.
The best card machine for your small business is the one that fits your turnover, your connectivity and your till, at the lowest total cost. Not the one that ranks first. Not the one the rep is pushing this month. Get those four scenarios right and you'll already beat most of the high street.
And don't fit it and forget it. Card sales grow, rates creep, and the deal that was right at £900 a month is rarely right at £4,000. With fees up around 25% since 2017, a yearly look at your statement is the cheapest money you'll ever save.
Common questions
Card machine questions, answered straight.
There is no single best card machine for every small business in the UK. The right one depends on how you trade. A sole trader at a market does best with a pay-as-you-go reader like SumUp Air or Square Reader. A cafe usually wants a countertop terminal with a printer. A wet-led pub needs a card machine tied into proper EPOS with reliable connectivity. A mobile trader needs a 4G reader that works without WiFi. Choose on total cost of ownership and how you actually take payments, not the headline rate.
The best card machine for a small business is the one that matches your turnover and your setup. Below roughly £2,000 a month in card sales, pay-as-you-go usually beats a monthly contract because you pay a flat percentage and nothing when it is quiet. Above that, a monthly plan with a lower per-transaction rate often works out cheaper. Always check settlement speed, contract length and whether it talks to your till before you sign anything.
Both are good. SumUp keeps it simple and cheap for occasional trading, with a low-cost reader and pay-as-you-go pricing. Square is stronger if you want a full ecosystem: free POS app, online ordering, invoicing and a countertop terminal that prints receipts. If you are a one-person stall, SumUp is hard to beat on price. If you are a cafe or shop wanting everything in one place, Square usually wins. Neither is the right answer for a busy pub with complex stock.
The cheapest way to take card payments for most small UK businesses is a pay-as-you-go card reader with no monthly fee. You buy the reader once, then pay a flat percentage per transaction, typically between 1.5% and 1.75%. There is no contract and nothing to pay in a quiet month. For very low volumes you can also use a phone-as-terminal app with no hardware at all. The cheapest option only stays cheapest while your card turnover is low, so review it as you grow.
Lowest fees depends on volume. For low turnover, pay-as-you-go readers from SumUp and Square sit around 1.5% to 1.75% per transaction with no monthly cost, which is usually the cheapest overall. For higher turnover, a monthly merchant plan can drop the per-transaction rate below 1%, so the monthly fee pays for itself. Watch for hidden costs: terminal rental, minimum monthly charges, authorisation fees and PCI fees can quietly add more than the headline rate.
On the basics they are very close. Square Reader and SumUp Air both charge a flat per-transaction rate in the 1.5% to 1.75% range with no monthly fee, and the hardware costs are similar. Square can work out cheaper overall if you use its free extras, like the POS app, invoicing and online store, instead of paying separately for them. SumUp can be cheaper if you genuinely only need a reader and nothing else. The difference for most small traders is small, so choose on features and fit rather than a fraction of a percent.
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