Best Card Machine for Small Businesses in the UK (2026)
If you run a small business in the UK and you are taking card payments, the machine you are using and the rates you are paying are worth reviewing. Most small business owners choose a provider early on and stick with it without ever questioning whether they are getting a fair deal.
The market has changed significantly in the last few years. Pay-as-you-go providers like SumUp and Square made card payments accessible for small businesses with no monthly fees and simple flat rates. But as transaction volumes grow, those flat rates become expensive. A business processing £15,000 per month at 1.75% is paying £262 in transaction fees alone. On a tiered pricing structure, that same volume can cost considerably less.
This guide covers the main types of card machine, what to look for when choosing a provider, what you should actually be paying in 2026, and why the right setup depends on how your business operates.
Types of Card Machine for Small Businesses
There are three main types of card machine and the right one depends on where and how your business takes payments.
Countertop terminal
A fixed device that sits on a counter and connects via a cable or fixed broadband connection. Best for businesses with a single payment point -- retail shops, reception desks, and any counter service environment where customers always come to you. Reliable, fast, and no battery to worry about. The PAX A35 is the countertop option in the BoonPay range.
Portable terminal
A wireless device that connects via Wi-Fi and 4G, designed to be carried around a business premises or handed to customers. The most popular choice for restaurants, pubs, cafes, and salons where staff need to take payments away from a fixed till point. Battery life is the key consideration. The PAX A50 handles a full day of trading comfortably and at 161g is light enough for all-day use. The PAX A920 Pro is the premium option with a built-in receipt printer and a 5,250mAh battery suited for high-volume venues.
Mobile terminal
The most compact option, designed for businesses that trade away from a fixed location entirely. Market stalls, mobile tradespeople, pop-up shops, and delivery businesses all benefit from a terminal that works purely on 4G without needing Wi-Fi. The Castle S1 Mini 2 is the lightest device in the BoonPay range at 160g and is built for exactly this use case.
What to Look for in a Card Machine for a Small Business
Beyond the hardware itself, the most important decisions are about the provider behind the machine. Here is what actually matters.
Transaction fees and pricing structure
This is the biggest cost consideration. Flat-rate providers charge the same percentage on every transaction regardless of card type. Tiered pricing separates debit cards from credit cards and typically charges less on debit, which makes up the majority of UK consumer payments. For any business processing more than around £5,000 per month in card payments, tiered pricing almost always works out cheaper.
Settlement speed
How quickly your takings land in your bank account affects your cash flow directly. Some providers settle in one business day, others take two to three. The difference between next-day settlement and three-day settlement on a busy week of trading is meaningful for any business managing regular outgoings. BoonPay offers next-day gross settlement as standard, which means the full amount you take lands in your account the following business day with no fees deducted before transfer.
Contract terms
Pay-as-you-go providers like SumUp and Square have no contracts, which is appealing early on. Traditional merchant service providers typically use 12 to 18 month contracts. Always check for auto-renewal clauses and early exit fees before signing. BoonPay offers 12 or 18-month terms with clear conditions explained before you commit.
Customer support
A card machine going down on a busy Friday evening is not something that can wait for a Monday morning email response. Check whether your provider offers phone support, what hours it operates, and whether you can speak to a real person rather than submitting a ticket. BoonPay offers 7-day UK-based support.
Hidden charges
Beyond transaction rates, watch for PCI compliance fees, minimum monthly service charges, statement fees, and chargeback administration charges. These can add £20 to £50 per month that is not visible in the headline rate. BoonPay charges £6 per month per terminal for PCI compliance, clearly itemised on every statement.
What Should a Small Business Actually Pay for a Card Machine in 2026?
To give this some real context, here is how the numbers break down for a small business processing £10,000 per month in card payments, assuming an 80% debit and 20% credit card split.
SumUp at 1.69% flat: £169 in transaction fees per month
Square at 1.75% flat: £175 in transaction fees per month
BoonPay tiered pricing: significantly lower on the debit portion, typically saving £50 to £80 per month at this volume
As a benchmark for what reasonable rates look like for a UK small business in 2026:
Debit card transactions: 0.35% to 0.6%
Consumer credit card transactions: 0.65% to 1.0%
PCI compliance: £6 per month per terminal, clearly itemised
Next-day gross settlement included as standard
If you are currently paying a flat rate above 1.75% and processing more than £5,000 per month in card payments, the annual saving from switching to tiered pricing is likely to run into several hundred pounds.
Which Card Machine Is Right for Your Type of Small Business?
The right device depends on your business environment. Here is a straightforward guide.
Retail shop or fixed counter: PAX A35 countertop or PAX A50 portable
Restaurant or pub with table service: PAX A920 Pro with built-in printer and large battery
Coffee shop or cafe: PAX A50 for counter service or PAX A920 Pro for table service
Salon or barbershop: PAX A50 portable with tip functionality built in
Market stall, mobile trade, or pop-up: Castle S1 Mini 2 with 4G connectivity
Healthcare or professional services: PAX A35 or PAX A50 depending on whether payments happen at a fixed desk or in a consultation room
Why Small Businesses Choose BoonPay
BoonPay is a UK-based card payment provider supplying businesses across the UK through our partnership with NPI, one of the UK's leading payment processors. Here is what makes the difference for small businesses specifically.
Tiered pricing based on your revenue, not a flat rate that becomes expensive as you grow
Next-day gross settlement as standard -- your full takings land in your account the following business day
Transparent pricing with every charge clearly itemised on your monthly statement
7-day UK-based support so you can reach a real person during evening and weekend trading hours
12 or 18-month contracts with no hidden exit fees
Built-in digital loyalty programme through NPI Payment Loyalty for businesses that want to reward repeat customers
Frequently Asked Questions
What is the best card machine for a small business in the UK?
The best card machine depends on how your business operates. For a fixed counter the PAX A35 or A50 works well. For businesses moving around the premises the PAX A50 is the most popular choice. For high-volume venues needing a receipt printer the PAX A920 Pro is the strongest option. For mobile businesses, the Castle S1 Mini 2 is the most portable device available through BoonPay.
How much does a card machine cost for a small business?
Costs include terminal rental, transaction fees, and PCI compliance. Terminal rental varies by device. Transaction fees with BoonPay start from 0.35% on debit and 0.65% on credit depending on your monthly revenue. PCI compliance is £6 per month per terminal, clearly itemised. There are no hidden charges or minimum monthly service fees.
Is it better to use SumUp or Square for a small business?
Both SumUp and Square work well for very new businesses or low-volume operations where a simple flat rate is the priority. Once your monthly card volume grows above around £5,000 per month, a tiered pricing structure like BoonPay typically works out cheaper. Flat-rate providers also bundle compliance and support costs invisibly into their percentage, whereas BoonPay itemises every charge so you can see exactly what you are paying.
What payment types do small business card machines accept?
All BoonPay terminals accept contactless, chip and PIN, Apple Pay, and Google Pay as standard. Visa and Mastercard are accepted on all devices. If you regularly take Amex payments, flag this when speaking to the team as rates on Amex transactions differ from standard card types.
How quickly do card payments settle for small businesses?
BoonPay offers next-day gross settlement as standard. Payments taken today land in your account the following business day in full, with no fees deducted before transfer. Fees are collected separately at the end of the month as a single clearly itemised bill.
Can I switch to BoonPay from my current card machine provider?
Yes. The switching process typically takes 7 to 14 working days. Check your current contract for any notice period. Once clear, BoonPay handles the setup and can have you up and running quickly. The team will walk you through the process and you can run both terminals briefly in parallel to avoid any gap in payment processing.
Do I need a long contract to use BoonPay?
BoonPay offers 12 or 18-month contract terms, which is more flexible than the three to five year agreements some traditional providers use. All terms are explained clearly before you sign and there are no hidden exit fees.
Find Out What BoonPay Would Cost Your Business
If you want a straight comparison of what you are currently paying versus what you would pay with BoonPay, get in touch. We will review your current setup, run the numbers, and give you an honest side-by-side breakdown.
Visit boonpay.uk/contact to get started.