Square POS & Card Reader Review

Square Review: The Verdict

Square is the right payment system for lean UK retail and hospitality operators who want flat 1.75% pricing, an integrated free POS, and a clean hardware ladder from the £19 Reader up to the £149 Terminal. It is the wrong system for established businesses processing five figures a month in card turnover, where Dojo, Worldpay or Takepayments will usually negotiate a meaningfully cheaper rate against a small monthly fee.

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Square at a Glance

Square is a single account that bundles card acceptance, point-of-sale software, an online store builder, invoicing and a customer directory. It has been live in the UK since 2017 through squareup.com/gb and is authorised to provide payment services locally. We verified the figures below from Square’s UK pages in April 2026.

The pitch is simplicity: one rate, no contract, no monthly fee, free software. The cost of that simplicity is that 1.75% never drops with volume unless you qualify for custom Premium pricing, which Square only opens up to businesses processing over £200,000 a year in card turnover. Most readers of this page will sit well below that threshold, which is the point at which Square works.

Square Hardware: Reader, Terminal, Stand and Tap to Pay

Square’s hardware ladder is unusually clean. The four devices we cover below cover almost every UK retail and hospitality use case, and the transaction rate stays at 1.75% whichever piece you buy. Spending more on hardware does not buy you a cheaper rate.

Tap to Pay on iPhone and Android — free

If you carry a modern iPhone (XS or newer) or a recent Android phone with NFC, Square’s POS app turns the phone itself into a contactless reader at no hardware cost. There is no PIN pad, so high-value chip transactions still need a Reader or Terminal, but for sub-limit contactless work it removes the hardware purchase entirely. This is the right starting point for a brand new business that wants to take a first payment the same day it signs up, before deciding whether to invest in physical kit.

Square Reader — £19 + VAT

The Reader is the cheapest entry point to full card acceptance in the UK. It is a pocket-sized contactless and chip device that pairs to a phone or tablet over Bluetooth 5.3 and runs through the free Square POS app on the paired device. Funds land the next working day, weekends and bank holidays included.

One quirk matters before you buy. The Reader has no screen and no keypad of its own. When a chip & PIN is needed, the POS app on the paired phone becomes the PIN pad, and the phone is handed to the customer. The handover is PCI-compliant and works in practice, but staff used to a traditional terminal usually need a week to settle into it. Brief the team before go-live and hand the phone over face-down to set the right rhythm.

The Reader is the right choice if you already trust your phone, you trade in environments where you carry your kit on you (markets, pop-ups, mobile services, hair and beauty that travels, gardening, dog grooming, driving instruction) and you want the smallest possible cash outlay to start.

Square Terminal — £149 + VAT

The Terminal is a standalone all-in-one device with its own screen, keypad, built-in thermal receipt printer and 4G or Wi-Fi connectivity. It does not need a paired phone. For a fixed counter, a small shop, a market caterer or a tradesperson taking payment at the end of a job, the Terminal removes the two biggest reliability risks of the Reader: a flat phone battery and a frozen app.

At £149 it costs about eight times the Reader. The right way to read that price is against the cost of a dropped sale. If you are turning over £200 a day and a Reader failure costs you even one half-day of trading, the Terminal has paid for itself. For any business where the counter rarely moves and staff change shifts, we would default to the Terminal over the Reader.

Square Stand — £149 + VAT

The Stand turns an iPad (sold separately) into a fixed counter POS, with the card reader integrated into the base. It is aimed at businesses that already own an iPad or want the bigger screen for menu navigation, table management or busier service rhythms — typically cafes, takeaways, small bars, beauty salons with a reception desk. It needs mains power and a stable internet connection, so it is not a mobile alternative to the Reader.

Choose the Stand over the Terminal when you want a customer-facing tablet screen to drive menu choices or upsells, and when the counter is fixed. Choose the Terminal when you want a single self-contained box with its own printer and screen, and when an iPad would feel like over-specification.

Square Handheld and Register

Two further devices sit above the core three. The Handheld at £169 is Terminal-sized with a built-in barcode scanner and integrated camera, aimed at restaurants doing tableside ordering and small retailers walking the floor. The Register at £699 is a fixed counter unit with two screens — one staff-facing, one customer-facing — and is overspecified for anyone outside high-traffic hospitality and fixed-counter retail. Both run at the same 1.75% in-person rate.

The Square POS Software

The Square POS app is free, and it is the strongest free POS we have seen in the UK market. Unlimited staff logins with role-based permissions, inventory with low-stock alerts, a customer directory tracking lifetime value and visit frequency, real-time sales reporting by day, item, category, staff member and location, digital gift cards, and an invoicing module with recurring bills and auto-reminders all sit on the free tier. Zettle and Shopify POS gate equivalent features behind paid subscription bands.

The logic Square applies is that the 1.75% transaction fee covers the software. That is generous at low volume and increasingly expensive at high volume — which is the same trade-off that defines the rate analysis below.

Where the free tier ends is sector-specific depth. Square for Restaurants adds floor plans, coursing and kitchen display integration. Square for Retail adds purchase orders and vendor management. Square Appointments handles bookings and deposits for beauty, fitness and services. These add-ons start at £29 a month under the Plus plan and are the right buy once you have more than about five staff or more than one site. Below that, the free core does the job.

What is missing compared to dedicated EPOS systems is warehouse-grade inventory, multi-warehouse stock flows, and the deeper purchase-order workflows that established retailers use. For a single shop or a small group of sites the free tier covers the work; for a five-site retailer with central buying and stock transfers between locations, Square’s reporting is shallower than a Lightspeed or Epos Now setup would offer.

Square Online and Remote Payments

Square Online is a free website builder with checkout, inventory sync and shipping integration. The online card rate is 1.4% plus 25p per transaction. For a single-channel business that wants a basic web shop synced to in-store stock, it works, and it sits on the same account as the rest of Square, so reporting, customer data and inventory all stay together.

It is, however, basic against a dedicated platform. If your online business needs flexible product variants, subscription billing, abandoned-cart automation or detailed checkout customisation, Square Online will feel thin. The route most growing businesses take is to keep Square for in-person and invoicing, and bolt Square’s payment integration onto a Shopify or WooCommerce site instead — both are supported with one-click installation.

Square Invoices is free, unlimited and includes recurring invoicing, card on file, and auto-reminders. Payments on invoices and on the Virtual Terminal (browser-based keyed-in entry, useful for phone orders) run at the 2.5% keyed rate, not the 1.4% online rate — a distinction worth modelling if invoicing is a meaningful share of your takings.

Square Pricing in Practice: Where 1.75% Wins, Where It Loses

The headline 1.75% rate is the right number to compare against any other UK provider’s in-person rate, but the right comparison is total monthly cost, not headline percentage. The flat-rate competitors (Zettle, SumUp, Revolut Reader) sit at similar rates with no monthly fee; the contracted competitors (Dojo, Worldpay, Takepayments, Paymentsense) negotiate a lower percentage in exchange for a monthly fee and usually a contract term.

The table below models the total monthly card-processing cost at three monthly card-turnover bands. Negotiated rates are illustrative — Dojo and Worldpay quote per business — but reflect the bands we see consistently in published rate cards and reader-submitted quotes through April 2026.

The numbers tell the same story we model repeatedly in our card-machines comparison. Below roughly £3,000 a month, Square almost always wins outright. Between £3,000 and £5,000 the maths is close but Square usually still edges it once you account for setup, contract risk and the cost of a monthly fee in quieter months. Past £5,000 a month, the flat rate starts to bite, and by £20,000 a month the gap to a negotiated provider is around £175 a month — over £2,000 a year — walking out of the till for the sake of contract simplicity.

A worked "not a fit" case makes this concrete. A small bistro turning over £30,000 a month in card payments pays Square £525 a month, every month, with no scope to bring it down. A negotiated Dojo rate of 0.8% plus a £20 monthly fee on the same turnover would cost £260 a month — a saving of £265 a month, or roughly £3,180 a year. That is staff hours, a new piece of kitchen kit, or the deposit on a delivery van. At that volume Square is the wrong system, full stop, and we would expect Dojo, Worldpay or Takepayments to compete hard for the business.

Two further pricing details often get missed. Non-UK cards taken in person carry an extra 1.5% surcharge, taking the effective rate to 3.25% — material for tourist-facing businesses where international cards can be 20–40% of takings. And instant payouts cost 1.5% of the amount transferred; used on every sale that compounds to an effective 3.25% per transaction, which sits very close to SumUp’s and Zettle’s headline rates. Instant transfer is best used selectively, not as the default.

Account Suspension Risk: What Triggers It and How to Mitigate

The most common complaint in negative public reviews of Square is the same one across every flat-rate provider that approves accounts in minutes: occasional account suspensions, reserves, or fund holds applied without much warning. This is a documented but quietly handled part of how Square operates, and it is worth understanding before you sign up rather than after.

The mechanism is straightforward. Square’s automated risk engine watches every account for transaction patterns that deviate from the expected baseline. Common triggers include:

• A new account suddenly processing a transaction much larger than its usual average — a fresh account taking a one-off £2,000 sale is a classic flag
• A sudden spike in transaction volume, particularly in the first few weeks
• A higher-risk merchant category code (ticketing, electronics resale, certain types of consultancy)
• A jump in chargeback rates or refunds
• Card numbers being keyed in repeatedly rather than dipped or tapped
• Transactions from a single card processed multiple times in quick succession

The consequences range from a soft hold (funds delayed by a few days while Square asks for documentation) through to a reserve (a percentage of takings held back for 30–120 days) and, in the worst cases, a full account closure. Most small traders never encounter any of this. Where it bites is unusual events on a newer account.

The practical mitigations are straightforward and worth applying from day one:

• If you know a large one-off payment is coming (a wedding cake deposit, a commissioned piece, a custom job), email Square support beforehand and flag it. A pre-notified large transaction is rarely held.
• Keep your account details accurate — business description, expected turnover, average transaction value. Square checks reality against what you told them at signup.
• Use chip & PIN or contactless wherever possible. Keyed-in transactions carry higher fraud risk and are weighted accordingly.
• For higher-risk categories, expect a reserve to be applied as standard. It is not personal.
• Keep a separate cash float and a backup payment method (a second reader from a different provider, or a Tap to Pay fallback on a different account). Operational redundancy is cheap insurance.
• If a hold or reserve is applied, respond to Square’s documentation request quickly and in full. Holds are usually resolved within days when invoices, supplier records and customer correspondence are supplied.

For most readers — a market stall, a small cafe, a mobile beautician taking under £5,000 a month — the risk is small and the mitigation is mainly "don’t be surprised by it". For higher-ticket or higher-risk businesses, it is a real factor in choosing between Square and a traditional acquirer, which typically underwrites the account upfront and rarely holds funds post-approval.

Customer Support and Reliability

Square offers phone, live chat and email support during UK business hours, plus a well-stocked online help centre. The self-service tools are genuinely useful: most common questions (refunds, payouts, hardware pairing, integration setup) are answered in the help articles without needing a human.

The honest limitation is the weekend gap. Out-of-hours queries sit until the next morning. If you are a Saturday market trader and your Reader stops pairing at 9am on a weekend, the support gap is the operational risk to plan around. Public Trustpilot reviews sit at around 4.1 stars across more than 2,000 reviews, with positive notes around easy setup and transparent fees, and negative notes clustered around phone wait times and the suspension risk described above.

On reliability, the Square POS app and processing network have been stable across our checks. The two failure modes worth knowing about are Bluetooth pairing drops (mitigated by keeping the Reader charged and the paired phone within range) and the offline-mode trade-off: the Reader can accept payments for up to 24 hours offline, but Square reserves the right to decline transactions taken offline if the card turns out to have insufficient funds when reaching the network. For low-value sales this is a non-issue; for a one-off £500 sale in a marquee with no signal, treat offline acceptance as a calculated risk.

Who Square Is and Isn’t Right For

Square is the right fit if you are:

• A mobile or occasional trader — market stall, street food, event caterer, mobile beauty, dog groomer, gardener, driving instructor, craft fair seller. The £19 Reader plus free software is the cheapest credible entry to UK card acceptance.
• A new or early-stage shop or cafe taking under roughly £5,000 a month in card payments, where the absence of a monthly fee more than offsets the higher per-transaction rate.
• A mixed-channel micro-business — Saturday market plus a small web shop plus the occasional phoned-in order — that wants one account, one dashboard, one reconciliation.
• A seasonal trader (summer markets, Christmas fairs, event-led work) who needs the option to go idle for months without paying a standing fee.

Square is the wrong fit if you are:

• An established retailer or hospitality venue processing £10,000+ a month in card turnover, where Dojo, Worldpay or Takepayments will negotiate a meaningfully lower rate in exchange for a monthly fee.
• A tourist-facing business taking a high share of non-UK cards, where the 1.5% international surcharge compounds the headline rate to 3.25%.
• A multi-site retailer with central buying and inter-site stock transfers, where Square’s reporting is shallower than a dedicated EPOS system.
• A business whose accountant works exclusively in Sage and needs a live bank feed — Square’s UK integrations cover Xero, Kashflow, Wix and WooCommerce, but there is no direct Sage feed as of April 2026.

Verdict

Square is the cleanest first card-acceptance system in the UK for any business taking under £5,000 a month, and it scales credibly up to a couple of small sites. Above £10,000 a month, the flat rate becomes the expensive end of the market, and a negotiated provider almost always undercuts it.

How We Assessed Square

We reviewed Square’s published pricing, hardware specifications, and feature documentation from square.com. Transaction rates, hardware prices, and settlement terms were verified against Square’s UK pricing page in May 2026. Trustpilot scores cited reflect the UK profile as of the same date. We did not accept payment or other consideration from Square in connection with this review.

Also Consider

SumUp — pick SumUp if you want the cheapest possible flat-rate entry point: 1.69% in person, £39 Reader, no monthly fee, no contract, settles to your bank account in 1–3 working days.

Zettle by PayPal — pick Zettle if you already use PayPal for online sales and want card takings to flow into the same balance, with similar 1.75% in-person pricing and a comparable free POS app.

Dojo — pick Dojo if you are processing more than £10,000 a month and want a negotiated rate (typically 0.8–1.2% plus a small monthly fee) with next-day or same-day settlement and a dedicated relationship manager.