Square Card Reader & Payments Review UK 2026

Square is a card payment system operated by Block, Inc. (NYSE: SQ) that lets UK small businesses accept Visa, Mastercard, and American Express payments in person and online. Squareup Europe Ltd is FCA authorised (FRN 900846) as an e-money institution. The standard transaction fee is 1.75% per in-person card payment with no monthly contract and no minimum spend. The first card reader is free. This review covers Square's UK fees, hardware costs, settlement speed, and whether the flat-rate pricing model works for your business in 2026.

Updated August 2026

Key Facts: Square UK

Who Is This Page For?

This page is for UK business owners researching Square as a payment provider. It covers fees, hardware options, settlement times, and honest pros and cons. It is most useful for sole traders, market stall holders, pop-up shop owners, mobile service providers, and small retailers or café owners who want a clear, independent view of whether Square suits their business and their budget.

It is also useful for anyone currently using Square who wants to check whether they could pay less by switching to a traditional merchant acquirer, or who wants to compare Square against alternatives such as SumUp, Zettle, Stripe, or Dojo.

Who Is Square For?

Square suits businesses that want to accept card payments immediately without lengthy applications or upfront hardware costs. Sole traders, market traders, mobile beauticians, and pop-up food vendors are typical users. The free card reader and flat 1.75% rate mean you can start taking payments on day one with very little financial risk.

Small retail shops, cafés, and independent restaurants also get value from Square, particularly because its point-of-sale app handles inventory, receipts, and basic reporting at no extra charge. Businesses processing under around £15,000 a month will generally find the flat-rate pricing acceptable. Above that volume, a negotiated interchange-plus deal from a traditional merchant acquirer will almost always cost less.

Square is not well suited to high-volume businesses, those operating in high-risk sectors, or companies needing bespoke integrations with legacy ERP systems. It is also a poor fit if you need a dedicated account manager or phone support as a free-plan user, since Square's customer service has historically been a weak point. If any of those apply to you, see our guide to the best merchant accounts for small businesses in the UK or our merchant account vs PSP comparison.

What Is the Square Payment System?

Square is a payment service provider (PSP) that combines card-reading hardware, point-of-sale software, online payments, invoicing, and basic business banking under one platform. Unlike a traditional merchant account, Square places all merchants on a shared pooled account rather than issuing individual merchant IDs. That is what allows it to approve accounts in minutes without lengthy underwriting. The trade-off is that automated risk systems can freeze or close accounts without much warning if unusual activity is detected.

Square was founded in San Francisco in 2009, launched in the UK in 2017, and is now a subsidiary of Block, Inc. It processes billions of pounds in card payments globally each year.

Square Features

• Free card reader: Every new Square account includes one free magstripe and chip reader. The contactless version costs £19 + VAT and connects via Bluetooth to your phone or tablet.
• Square Terminal: A standalone card machine with a built-in receipt printer, priced at £149 + VAT. It operates independently without needing a phone or tablet nearby.
• Square Register: A full point-of-sale hardware setup with a customer-facing screen, priced at £649 + VAT. Aimed at small retail and café environments that want a permanent counter setup.
• Square Online: A free website builder with built-in ecommerce and payment processing. Online card transactions are charged at 1.4% + 25p per transaction.
• Point-of-sale software: The Square POS app is free and covers item management, discounts, refunds, basic stock tracking, and digital receipts. Specialist versions exist for restaurants and retail.
• Invoicing and pay-by-link: Square Invoices lets you send payment requests by email or text. The free plan charges 1.75% per invoice paid by card. A paid Invoices Plus plan at £20 + VAT per month reduces this to 1.4% + 25p.
• Square Banking: Square offers a linked business current account, a savings account, and access to Square Loans. Loan repayments are taken as a percentage of daily sales rather than fixed monthly instalments.
• Next-day and same-day settlement: Funds reach your linked bank account by the next business day at no extra cost. Same-day transfers are available for a 1% fee, with a minimum charge of 50p per transfer.

Square Fees and Pricing

Square uses flat-rate, blended pricing. One percentage applies regardless of whether the customer pays with a basic debit card or a premium rewards credit card. This simplicity is useful for forecasting costs, but it means you pay more per transaction than you would with interchange-plus pricing once your monthly card volume grows.

How much does Square charge per transaction in the UK?

Square charges 1.75% per in-person card transaction in the UK, covering chip and PIN, contactless, and magstripe payments. Manually keyed transactions cost 2.5%. Online payments through Square Online cost 1.4% + 25p. American Express is processed at the same 1.75% in-person rate as Visa and Mastercard.

To put the 1.75% rate into context: at £10,000 monthly card volume, Square takes £175 in transaction fees. A traditional merchant account with a blended rate of 0.9% would cost £90 for the same volume, saving around £85 a month or roughly £1,020 a year. The gap widens as turnover grows, so Square becomes progressively less competitive above around £15,000 a month.

Square does not publish a custom pricing tier for high-volume merchants in the same way that Stripe or Adyen do, though it states on its website that bespoke rates may be available. If you are processing significant volume, it is worth requesting a quote from a traditional acquirer before assuming Square is your cheapest option. Our guide to interchange-plus vs blended pricing explains the difference in detail.

Does Square charge a fee for debit cards?

Yes. Square charges the same flat 1.75% rate for all in-person card payments, including debit cards. There is no lower rate for debit card transactions, which is a disadvantage compared with interchange-plus pricing where debit cards typically attract lower interchange fees.

Does Square charge a monthly fee?

The standard Square plan has no monthly fee. You only pay the per-transaction rate. Square for Restaurants Plus costs £60 + VAT per month per location, and Square for Retail Plus costs £49 + VAT per month. The Invoices Plus plan costs £20 + VAT per month and reduces invoice transaction fees to 1.4% + 25p.

Square Card Reader Fees: Complete Breakdown

The Square card reader itself does not carry a monthly rental charge. All costs are per-transaction. The free starter reader handles magstripe and chip payments. The contactless Bluetooth reader costs a one-off £19 + VAT. After purchase, neither reader carries any ongoing cost beyond the 1.75% per-transaction rate.

The Square Terminal charges the same 1.75% per transaction and costs £149 + VAT to buy outright. There is no monthly terminal rental fee. The Square Register costs £649 + VAT and carries the same transaction rate. Both are owned outright. You are not locked into a hardware lease, which is a meaningful advantage over some traditional acquirers that require a 36- to 48-month terminal rental contract.

For context on how terminal rental contracts at traditional acquirers work, see our guide to early termination fees in merchant contracts.

Square Terminal Fees and Charges

The Square Terminal costs £149 + VAT as a one-off purchase. There is no monthly terminal fee, no rental charge, and no service contract. Every card payment through the Terminal is charged at 1.75%, whether the customer taps, inserts, or uses a mobile wallet such as Apple Pay or Google Pay.

Same-day settlement from the Terminal costs 1% of the transfer amount, with a minimum of 50p. Standard next-business-day settlement is free. The Terminal does not require a nearby smartphone or tablet, which makes it practical for market traders and mobile service providers who need a fully independent device.

Square Online Payment Processing Fees

Square Online transactions cost 1.4% + 25p per payment. That applies whether you use Square's own website builder, the Square payment API, or Square's hosted payment pages. It is cheaper than the in-person 1.75% rate for higher-value transactions, though the fixed 25p element makes it proportionally more expensive on very small transactions.

For a £5 transaction online, the effective rate is (7p + 25p) / £5 = 6.4%. For a £50 transaction, it drops to (70p + 25p) / £50 = 1.9%. If your average online order value is low, that fixed element adds up quickly. Stripe charges 1.5% + 25p for UK card transactions, so it is marginally cheaper for online payments at most order values.

How Square Compares to Alternatives

Square sits in a competitive market alongside SumUp, Zettle, PayPal Here, and Stripe for small business card payments. The table below compares headline in-person rates and upfront hardware costs.

Square's free starter reader is its clearest hardware advantage. SumUp charges £39 + VAT for its Air reader, and Zettle charges £29 + VAT. At 1.75%, Square's in-person rate matches Zettle but is slightly above SumUp's 1.69%. For a fuller comparison, see our Square vs SumUp review and our Zettle vs Square comparison.

Square Card Reader Reviews: What Do Merchants Say?

Square scores well for ease of setup, hardware quality, and the breadth of its free POS software. Merchants frequently highlight how quickly they can get started, often within an hour of signing up. The Square Terminal in particular receives strong reviews for its standalone design and built-in receipt printer.

Negative feedback clusters around three areas. Account freezes and closures with limited explanation are the most common complaint, particularly for businesses in sectors Square considers higher risk. Customer support on the free plan is the second common issue, with email response times cited as slow. Third, merchants with growing volumes regularly discover the 1.75% rate has become expensive once they start comparing alternatives. These are consistent themes across Trustpilot and independent review sites rather than isolated incidents.

If account stability is important to your business, our guide to merchant accounts vs payment service providers explains why a dedicated merchant account may offer more protection.

Pros and Cons

Pros

• No monthly contract: You can stop using Square at any time with no early termination fee. That matters for seasonal businesses or anyone unsure about volume.
• Free hardware to start: The first card reader is free. Most competitors charge between £19 and £49 for an entry-level device, so this is a genuine saving for new businesses.
• Fast setup: Most accounts are approved and ready to take payments within minutes. There is no lengthy underwriting process for standard-risk businesses.
• All-in-one platform: POS software, online store, invoicing, and basic banking sit under one login. That reduces the number of separate tools a small business needs to manage.
• No PCI compliance fee: Square handles PCI DSS compliance on your behalf at no extra charge, unlike some traditional acquirers that add £30 to £60 per year for this.
• Accepts American Express: Square processes Amex cards at the same 1.75% rate as Visa and Mastercard. Many traditional acquirers charge a higher rate or exclude Amex altogether.

Cons

• Expensive at higher volumes: At £30,000 monthly turnover, the 1.75% rate costs £525 in transaction fees. A negotiated rate of 0.7% with a traditional acquirer would cost £210, saving £315 a month or £3,780 a year.
• Account stability concerns: Square can hold or close accounts with limited notice if its risk algorithms flag unusual activity. This is a known issue across payment service providers that pool merchants rather than issue individual merchant accounts.
• Weak phone support on free plan: Phone support is only available to paid plan subscribers and Square Banking customers. Free plan users are directed to email and an online help centre, which can be frustrating if you have an urgent payment issue.
• Not suitable for high-risk sectors: Square does not accept businesses in categories including adult content, gambling, firearms, or certain financial services. If your sector sits anywhere near those boundaries, you risk account termination. See our guide to high-risk merchant accounts in the UK.
• Limited offline functionality: Square's card reader requires an internet connection for most transactions. Offline mode exists but has a transaction cap and carries added risk of declined cards not being flagged in real time.
• Flat rate penalises debit card transactions: Square charges the same 1.75% for debit and credit cards. With interchange-plus pricing, debit card interchange is typically under 0.3%, so high-debit-card businesses overpay considerably.

Square Payment Processing: Is It a Payment Gateway?

Square is a payment service provider (PSP), not a standalone payment gateway. It combines the gateway, processing, and acquiring functions in one product. You do not need a separate merchant account or payment gateway to use Square. Everything runs through Square's own infrastructure.

That differs from providers like Opayo or Stripe, which offer a gateway that connects to a separate acquirer. For businesses that want to separate those functions, or need a gateway that connects to their existing bank, a traditional setup may work better. Our guide to payment gateways vs merchant accounts covers the distinction in plain terms.

How Square Works for Small Businesses

Setting up Square takes around 10 to 15 minutes. You create an account on square.com, verify your identity, and link a UK bank account. Square sends the free magstripe reader by post in three to five working days. The contactless reader and Terminal can also be ordered direct from Square's website.

The Square POS app is free to download on iOS and Android. It handles item catalogues, discounts, refunds, tipping, and digital receipts. You can add staff profiles, track basic inventory, and run sales reports all within the free plan. That breadth of functionality is one of Square's genuine strengths compared with simpler card-reader-only products like SumUp.

Settlement lands in your linked bank account by the next business day at no extra cost. If you need funds the same day, Square's instant transfer option costs 1% of the transferred amount, with a minimum fee of 50p.

Is Square Right for Your Business?

Square is genuinely one of the best options for small and new businesses taking card payments in the UK for the first time. The absence of a monthly contract, a free starter reader, and a single transparent rate make it easy to try without financial commitment. If you are a sole trader, a market vendor, or a business taking under £10,000 a month in cards, Square likely represents fair value for money.

The picture changes once your card turnover climbs. At £20,000 a month, the 1.75% rate costs £350 in fees. Moving to a blended rate of 0.8% with a traditional acquirer reduces that to £160, saving £190 a month or £2,280 a year. That saving typically covers the cost of a leased terminal and any monthly service fee, and you would still come out ahead. The crossover point where Square stops being competitive varies by business, but for most merchants it arrives somewhere between £10,000 and £15,000 of monthly card turnover.

If you are approaching that level or already past it, it is worth getting competing quotes before renewing any arrangement with Square. Read our guide on when to switch payment provider and how to negotiate lower card processing fees. Compare Card Fees can help you do that quickly and without commitment.