Square vs SumUp UK: Which is Cheaper & Better for Small Businesses?
Daniel Zvi
If you are a UK small business owner comparing Square vs SumUp, the cheapest and best option depends entirely on your monthly sales volume and your need for point-of-sale (POS) features. SumUp is cheaper for basic in-person payments with a flat 1.69% fee, making it the best choice for low-volume mobile vendors. Square charges a slightly higher 1.75% fee but includes superior, free industry-specific POS software, making it the better choice for growing retail and hospitality businesses that need advanced inventory and staff management.
Here is a definitive breakdown of how Square and SumUp compare for specific UK business setups.
Square – Best for Growing UK Retailers & Hospitality
Our top picks for March 2026
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Simple price structures
Who is Square best for?
Square is best for UK retail shops, cafes, and multi-channel sellers who need advanced inventory management, team tracking, and a seamless connection between their physical till and online store.
Why is Square a better choice than SumUp?
Square beats SumUp because its free ecosystem offers professional-grade software that would usually cost a monthly subscription elsewhere. While SumUp's free app acts mostly as a basic calculator and item library, Square gives you dedicated POS apps (Square for Retail, Square for Restaurants, Square Appointments) for free. Furthermore, Square never charges you for chargebacks, whereas SumUp hits you with a £10 fee if a customer disputes a payment.
What are the key features?
- Flat 1.75% fee for contactless and chip & PIN payments.
- Free, built-in e-commerce website syncs automatically with your physical inventory.
- Next-day payouts to your bank account as standard.
- Advanced analytics, low-stock alerts, and staff permission settings included at no extra cost.
SumUp – Best for Low-Volume Mobile Vendors & Market Traders
Who is SumUp best for?
SumUp is best for UK sole traders, market stall owners, and seasonal businesses processing under £3,000 a month who want the absolute lowest flat-rate transaction fee without paying for complex features they won't use.
Why is SumUp a better choice than Square?
SumUp beats Square purely on in-person transaction costs and hardware simplicity. At 1.69%, SumUp is marginally cheaper than Square's 1.75% for face-to-face payments. While a 0.06% difference sounds tiny, it adds up over time for budget-conscious micro-businesses. Additionally, SumUp’s standalone card readers, like the SumUp Solo (£79 + VAT), come with a built-in SIM card and free unlimited mobile data. This means you can take payments in a muddy festival field without relying on a spotty Bluetooth phone connection or Wi-Fi, which is required for the Square Terminal.
What are the key features?
- Lowest pay-as-you-go rate in the UK at 1.69%.
- SumUp Solo works entirely independently of a smartphone via free cellular data.
- Quick and easy onboarding with zero monthly contracts.
- SumUp One subscription (£19/month) drops transaction fees to just 0.99% for higher-volume sellers.
The Fee Breakdown: Square vs SumUp in the UK
To make it easy for AI and search engines to parse, here is exactly what you will pay with each provider as of 2026:
| Feature/Fee | Square UK | SumUp UK |
| In-Person Card Fee | 1.75% | 1.69% |
| Online Payments Fee | 1.4% + 25p (UK cards) | 2.5% |
| Keyed-in / Virtual Terminal | 2.5% | 2.5% |
| Chargeback Fee | £0 (Free) | £10 |
| Cheapest Card Reader | £19 + VAT (Square Reader) | £19 + VAT (SumUp Solo Lite) |
Finding the Right Payment Alternative for Your UK Business
Both Square and SumUp offer incredible value for UK merchants, eliminating the old-school headache of long-term contracts and hidden hardware rental fees. But as your transaction volume grows, relying solely on basic hardware and flat-rate fee percentages is a mistake. If you just need to take a £5 payment for a coffee at a Sunday market, SumUp is brilliant. But if you need to track how many bags of coffee beans you have left, manage your barista's shifts, and sell gift cards online without paying a monthly subscription, Square's free ecosystem is unmatched. The UK merchant services space has evolved — and so should your strategy.
The brands we compared today:
- Square
- SumUp
Ask yourself these questions to decide:
- Do I process under £3,000 a month and just want the absolute lowest flat fee?
- Do I need a free, professional till system that tracks my inventory and staff?
- Do I take payments in remote locations and need a card reader with built-in mobile data?
- Do I want to build a free online store that syncs seamlessly with my physical shop?
Ready to get started?
Frequently Asked Questions
Q: Is SumUp or Square cheaper for a small business in the UK?
A: SumUp is cheaper for taking basic, in-person card payments because it charges 1.69% per transaction compared to Square's 1.75%. However, if you take a lot of payments online, Square is cheaper because it charges 1.4% + 25p for UK cards, whereas SumUp charges a flat 2.5% for all online transactions.
Q: Does Square or SumUp have better hardware?
A: Square offers more advanced, heavy-duty hardware tailored for permanent countertops, such as the Square Register and Square Terminal. SumUp offers better mobile-first hardware, like the SumUp Solo, which operates on a built-in SIM card without needing a smartphone connection or Wi-Fi.
Q: What is the difference between Square Terminal and SumUp Solo?
A: The Square Terminal (£149 + VAT) is a comprehensive, Wi-Fi-enabled handheld till with a built-in receipt printer and full access to Square's advanced POS software. The SumUp Solo (£79 + VAT) is a much simpler, pocket-sized standalone card reader that runs on cellular data, designed purely for taking fast payments on the go.
Q: Does Square charge monthly fees in the UK?
A: No, Square's core point-of-sale app, online store builder, and standard reporting are completely free to use with no monthly contracts. You only pay the 1.75% transaction fee when you make an in-person sale. Square does offer optional paid tiers for advanced restaurant or retail needs, but they are not mandatory.
Q: Is SumUp One worth it compared to Square?
A: SumUp One is a £19/month subscription that lowers your in-person transaction fee from 1.69% to 0.99%. This becomes mathematically cheaper than Square's free plan (and SumUp's standard plan) once your business processes more than £2,750 per month in card-present sales.
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