Retail Merchant Services UK 2026

This page is for UK retail businesses that accept card payments in a physical setting. Whether you run an independent shop, a market stall, a pop-up or a small chain, Compare Card Fees is a free, independent advisory service that has helped UK businesses find better card payment deals since 2012. We compare transaction fees, card machine costs and contract terms so you can choose the right retail merchant services provider without overpaying or locking into the wrong deal.

What to Look For in a Retail Merchant Services Payment Provider

Transaction fees are the biggest ongoing cost for most retailers. You will typically see a percentage of each sale plus a small fixed pence-per-transaction charge. For example, Zettle by PayPal charges 1.75% per transaction on its pay-as-you-go plan, whilst a negotiated rate through Worldpay for a higher-volume retailer might be as low as 0.5% plus 4p for UK debit cards. Always ask for a full breakdown of rates for UK debit, UK credit, European and non-European cards separately, because blended rates can hide expensive surprises on premium or business cards.

Hardware needs differ significantly across retail formats. A fixed shop needs a countertop terminal or an integrated point-of-sale system. A market trader needs a portable card reader with a strong battery life and offline capability. Pop-up retailers need something that connects via Bluetooth to a smartphone and requires no fixed broadband. Confirm whether the provider charges a monthly rental for hardware or sells it outright. Renting a terminal at £25 per month over 36 months costs £900, whereas buying the same device outright for £150 saves £750 over the same period.

POS software integration matters if you use stock management, accounting or loyalty tools. Providers like Square and Zettle have built-in inventory tracking, which suits independent shops that cannot afford a separate EPOS system. Others, such as Worldpay and Stripe Terminal, integrate with third-party platforms including Lightspeed, Shopify POS and Vend. Check compatibility before you commit. Switching EPOS mid-year is disruptive and costly.

Contract flexibility and settlement speed are often overlooked. If your retail business is seasonal or you are testing a new location, a rolling monthly contract removes the risk of paying for a service you are not using. On settlement, most established providers credit your bank account by the next working morning. Some newer providers default to a two-day cycle unless you upgrade your plan. Fast settlement matters for cash flow, especially for retailers with tight margins or weekly supplier payments.

Fee Comparison Table

Best Providers for Retail

Square

Square charges 1.75% per in-person transaction with no monthly fee on its free plan. The Square Reader costs £19 + VAT and the Square Terminal costs £149 + VAT, both purchased outright. There is no contract, so you can stop at any time. Settlement lands in your linked bank account by the next business day.

Square's built-in EPOS is a genuine differentiator for independent retailers. It handles inventory tracking, staff management, sales reporting and customer profiles without requiring any third-party software. The Square for Retail Plus plan at £49 + VAT per month adds advanced stock management across multiple locations, which suits small chains.

The honest downside is that 1.75% becomes expensive at high volumes. A retailer turning over £30,000 a month in card sales pays £525 in fees. Worldpay or Barclaycard would charge considerably less at that level. Square suits retailers up to around £15,000 to £20,000 per month in card sales before the flat rate stops making sense. Read the full Square review.

Zettle by PayPal

Zettle by PayPal charges 1.75% per in-person transaction on all UK card types, with no monthly fee and no long-term contract. The Zettle Reader 2 costs £29 + VAT for first-time buyers. Funds settle to a PayPal account the same day, or to a linked bank account within one to two business days.

Zettle integrates well with PayPal's broader payment ecosystem, which is useful if you also sell online or take phone orders. The app includes stock management and sales reporting. It connects to Xero and QuickBooks for accounting. For a market trader who already uses PayPal for online sales, this joined-up reporting is a practical advantage.

Zettle's one-size fee means it has the same volume problem as Square. It also lacks advanced EPOS features compared to dedicated systems. If you need table management, appointment booking or complex stock variants, you will likely outgrow it. Read the full Zettle by PayPal review.

SumUp

SumUp offers 1.69% per in-person transaction on its standard pay-as-you-go plan, dropping to 0.99% on the SumUp One plan at £19 + VAT per month. The SumUp Air card reader costs £39 + VAT. There is no long-term contract on either plan. Settlement is the next business day.

The 0.99% rate on SumUp One is one of the lowest flat rates available to small retailers in the UK without volume negotiation. A shop taking £10,000 a month in card payments would pay £99 in transaction fees on SumUp One, compared to £175 on the standard 1.75% plans at Square or Zettle. The saving is £76 per month, or £912 per year, minus the £228 annual plan cost. Net saving: approximately £684 per year.

SumUp's EPOS software is less mature than Square's. The reporting tools are adequate but not sophisticated. Retailers needing detailed inventory management across multiple categories may find it limiting. Read the full SumUp review.

Worldpay

Worldpay is one of the largest card payment processors in the UK. Rates are negotiated based on volume, but a typical small retail business can expect to pay from around 0.75% for UK debit cards and 1.2% for UK credit cards, plus a monthly fee from £19.95 + VAT. Contracts typically run for 12 to 18 months.

Worldpay suits established retailers with consistent monthly card volume above £15,000. At that level, the lower per-transaction rates offset the monthly fee and contract commitment. Worldpay's terminals integrate with a wide range of EPOS platforms including Lightspeed and Shopify POS. Settlement is next-day as standard.

The main drawbacks are the contract length and the complexity of the pricing. Worldpay quotes can be difficult to interpret, and early termination fees apply. It is not the right choice for a start-up or a seasonal retailer. Read the full Worldpay review.

Barclaycard Payments

Barclaycard Payments offers transaction rates from around 0.5% for UK debit cards for higher-volume retailers, with monthly fees starting from £15 + VAT. The best rates are typically available to businesses that also hold a Barclays business bank account. Contracts are usually 12 months minimum.

Barclaycard's reporting tools integrate directly with Barclays business banking, which simplifies reconciliation. Settlement is next-day. Hardware options include the Barclaycard Anywhere terminal and countertop machines from Ingenico and Verifone. Support is UK-based and available seven days a week.

If you do not bank with Barclays, the pricing advantage largely disappears and you would likely get a better deal elsewhere. Set-up can also take longer than with newer providers. Some retailers wait two to three weeks for terminal delivery and account activation. Read the full Barclaycard Payments review.

Pros and Cons by Provider Type

Card Machine Providers (e.g. SumUp, Zettle, Square)

• No long-term contract on most plans
• Low upfront hardware cost, typically £20 to £150
• Simple flat-rate pricing with no hidden fees
• Quick to set up, often the same day
• Transaction fees become expensive at volumes above £20,000 per month
• Limited customisation for complex retail environments
• Customer support can be slower than with traditional acquirers

Traditional Acquirers / Payment Gateways (e.g. Worldpay, Barclaycard)

• Lower per-transaction rates at higher volumes
• Interchange-plus pricing available, which is more transparent at scale
• Broader hardware range and enterprise EPOS integration
• Dedicated account management for larger accounts
• Long contracts of 12 to 18 months with early exit fees
• Slower onboarding, sometimes two to three weeks
• Pricing can be opaque and difficult to compare directly
• Monthly fees apply regardless of trading volume

All-in-One POS Platforms (e.g. Square for Retail, Lightspeed with integrated payments)

• Single system for payments, stock, reporting and sometimes staff management
• Reduces need for separate EPOS software and its associated cost
• Consistent interface across hardware and app
• Easier to train staff on one platform
• Often more expensive per month once full POS features are unlocked
• Switching later is harder because your data is held in a proprietary system
• Processing rates may not be as competitive as a standalone acquirer at high volumes

Which is Better For...?

Independent High Street Shops

An independent high street shop typically needs a countertop terminal, inventory tracking, and a provider that can handle both card and contactless payments reliably. Square or SumUp One are the strongest options for shops turning over under £20,000 per month in card sales. Above that level, get quotes from Worldpay and Barclaycard and compare the all-in monthly cost including hardware rental, transaction fees and any PCI charges. The difference between a flat 1.75% rate and a negotiated 0.9% rate at £25,000 monthly volume is £212 per month, or £2,544 per year.

Market Traders

Market traders need a portable reader with strong battery life, mobile connectivity via 4G or Bluetooth, and no dependency on fixed broadband. SumUp Air and Zettle Reader 2 are both well-suited. The SumUp Air battery lasts up to 500 transactions on a single charge. Zettle Reader 2 handles around 100 transactions. Both work via a smartphone app. For traders operating in areas with poor mobile signal, check whether the reader supports offline mode. SumUp Air does allow a limited number of offline transactions; Zettle does not currently offer this feature.

Pop-Up Shops and Seasonal Retailers

Pop-up and seasonal retailers need a provider with no long-term contract and no monthly fee when not trading. Square and Zettle both fit this profile. You pay only when you take a payment. If you run a Christmas market stall for six weeks, you pay 1.75% on what you process and nothing during the other 46 weeks. Avoid any provider that requires a 12-month contract or charges a monthly minimum. Some traditional acquirers impose a minimum monthly service charge of £15 to £25 even in months with zero transactions.