Best Card Machine for Small Business UK 2026

Compare Card Fees is a free, independent advisory service that has helped UK businesses find better card payment deals since 2012. This page is for small business owners in the UK who want a card machine that fits their budget, their sales volume, and the way they actually work. Whether you take £2,000 or £20,000 a month by card, the right provider can save you hundreds of pounds a year. We compare real fees, contract terms, and settlement speeds so you can make a confident, informed choice.

What to Look For in a Small Business Card Payment Provider

Transaction fees are the number that matters most over time. Most pay-as-you-go providers charge a flat percentage on every card payment: 1.69% at SumUp, 1.75% at Square, and 1.75% at Zettle. At £8,000 monthly card turnover, moving from 1.75% to 1.69% saves around £5.76 a month, or just under £70 a year. That is modest, but if you process £30,000 a month the same switch saves over £250 a year. Know your volume before you pick a provider.

Hardware needs differ by business type. A mobile trader needs a compact Bluetooth reader that pairs with a phone. A counter-based retailer benefits from a standalone terminal with a built-in printer. Some providers, such as Tide and Worldpay, offer countertop terminals on a rental basis, which can make sense if you want to avoid upfront hardware cost. Just check the total rental outlay: a terminal at £20 a month costs £240 over a year, which is more than buying a SumUp Air outright.

Point-of-sale and software integration can save significant time each week. Square includes a free POS app with inventory management, end-of-day reports, and staff management. Zettle integrates with WooCommerce, BigCommerce, and QuickBooks. SumUp's POS integration is limited compared with rivals, though it does connect with a handful of accounting tools. If you run an e-commerce store alongside a physical shop, test the integration before committing.

Contract flexibility and settlement speed are easy to overlook. Pay-as-you-go providers give you the freedom to switch without a penalty. Traditional merchant account providers such as Worldpay often require 12 to 18-month contracts with early termination fees that can run to hundreds of pounds. Settlement speed matters for cash flow: Square settles to your bank account by the next business day, while some merchant accounts take two to three working days. For a business with tight cash flow, that difference is real.

Fee Comparison Table

Rates shown are standard published rates as of June 2026. Worldpay rates are indicative; actual pricing depends on your business type, volume, and card mix. Always request a written quote before signing.

Best Providers for Small Businesses

SumUp

SumUp charges 1.69% on every card transaction, which is the lowest flat rate among the major pay-as-you-go providers in the UK. There is no monthly fee, no minimum turnover, and no contract. The SumUp Air card reader costs £39 plus VAT and connects via Bluetooth to the free SumUp app on iOS or Android. For a small business taking £3,000 a month by card, total monthly fees are just over £50, with no surprises.

SumUp also offers a free business account with a dedicated sort code and account number, which makes reconciliation straightforward. Funds settle to your bank account within one to three business days. The main limitation is POS software: SumUp's app is functional but does not match Square for inventory depth or reporting. If you need detailed stock management, look elsewhere.

SumUp is FCA-registered and has been operating in the UK since 2012. It is a strong first card machine for a new business or sole trader who wants simplicity and low upfront cost. Read the full SumUp review.

Square

Square charges 1.75% per card transaction in person, with no monthly fee on its free plan. The Square Reader costs £19 plus VAT, making it the cheapest reader among the major providers. Square's real strength is its free POS software, which includes inventory tracking for up to unlimited items, staff management, and daily sales reports. For a retail or hospitality business, that replaces software that would otherwise cost £20 to £50 a month.

Settlement is next business day as standard, which is faster than several rivals. Square also offers a free Square Card, a prepaid Mastercard that lets you spend your Square balance immediately rather than waiting for a bank transfer. The free plan covers most small businesses, though Square's paid plans (from £20 a month plus VAT) add features such as advanced reporting and team management.

The honest drawback is that Square has no phone support on the free plan. Support is via email and live chat only. For businesses that want a phone number to call, that is worth considering. Read the full Square review.

Zettle by PayPal

Zettle charges 1.75% per in-person transaction and sells its Zettle Reader 2 for £29 plus VAT. Like Square and SumUp, there is no monthly fee and no contract. Zettle's standout advantage is its PayPal integration: if your business already accepts PayPal online, Zettle unifies your in-person and online sales reporting in one place. Settlement typically takes one to two business days to your PayPal account, from where you can transfer to your bank.

Zettle integrates with QuickBooks, WooCommerce, BigCommerce, and Shopify, which makes it a practical choice for businesses running an online store alongside a physical location. The POS app includes inventory management and sales history. It is not quite as feature-rich as Square's free POS, but it is capable enough for most small retailers and market traders.

One limitation worth flagging: funds sit in your PayPal account before reaching your bank, which adds a step. If you do not have a PayPal business account, Zettle is less compelling. Read the full Zettle review.

Worldpay

Worldpay suits small businesses that are growing past the pay-as-you-go tier. Its pricing uses interchange-plus methodology, which means transaction rates from around 1.0% for UK debit cards, though the blended rate including card fees and monthly charges typically works out higher than that headline figure. Terminal rental starts from £17.99 a month. Contracts are typically 12 to 18 months.

Worldpay is the UK's largest payment processor by volume and is FCA-authorised. It accepts the widest range of card types and offers dedicated UK phone support seven days a week. For a business turning over £20,000 a month or more by card, negotiating a bespoke rate with Worldpay can undercut flat-rate providers. Below that volume, the monthly rental and contract commitment usually make it more expensive overall.

The clear downside for small businesses is contract lock-in. Early termination fees apply, and some users report difficulty switching provider at contract end. Read the terms carefully before signing. Read the full Worldpay review.

Pros and Cons by Provider Type

Pay-as-You-Go Card Machine Providers (SumUp, Square, Zettle)

• No monthly fee and no long-term contract
• Hardware available to buy outright from £19
• Simple flat-rate pricing, easy to budget for
• Fast to set up: typically trading within 24 hours of applying
• Transaction rates are higher than negotiated merchant account rates at high volumes
• Customer support is typically online only, with no dedicated account manager
• Some providers hold funds for up to three business days before settlement

Traditional Merchant Account Providers (Worldpay, Barclaycard)

• Lower per-transaction rates achievable at volumes above £15,000 to £20,000 a month
• Dedicated phone support and an account manager in most cases
• Wide card type acceptance, including American Express in some cases
• Contracts of 12 to 18 months are standard, with early termination fees
• Setup and approval can take five to 10 working days
• Monthly rental fees for terminals add to total cost
• Pricing is less transparent: always request a written quote

All-in-One Payment Platforms (Stripe, PayPal)

• Handles both online and in-person payments under one account
• Strong developer tools and API access for custom integrations
• Stripe charges 1.5% plus 25p for UK cards online, and 1.7% plus 7p in person
• PayPal charges 1.9% plus a fixed fee online, higher than specialist card machine providers in person
• Account freezes and fund holds are more commonly reported than with dedicated merchant accounts
• Better suited to businesses with significant online volume than pure in-person sellers

Which is Better For...?

Which card machine is best for a new small business with under £3,000 monthly card sales?

SumUp or Square is the right choice for a new business taking under £3,000 a month by card. Both have no monthly fee and no contract. At £3,000 a month, SumUp's 1.69% rate costs £50.70 in fees; Square's 1.75% costs £52.50. The £1.80 monthly difference is negligible. Square edges it if you want free POS software and faster next-day settlement.

Which card machine is best for a small retailer with a physical shop?

Square is the strongest option for a small retailer with a counter-based shop. Its free POS software handles inventory, end-of-day reports, and staff permissions without a monthly charge. At £10,000 monthly card sales, the 1.75% fee totals £175 a month, with no additional software cost. Zettle is a close alternative if you also sell online through WooCommerce or Shopify. For retailers processing over £20,000 a month, request a quote from Worldpay to compare the total cost including terminal rental.

Which card machine is best for a mobile or market-based small business?

SumUp Air is the most practical card machine for mobile and market-based sellers. The reader weighs under 65 grams, connects via Bluetooth, and runs for up to eight hours of active use on a single charge. At 1.69% per transaction with no monthly fee, the cost is predictable. A SumUp 3G reader (£69 plus VAT) works without a paired phone, which is useful on a busy market stall where using your phone as a hotspot is impractical.