Introduction
Choosing a payment gateway is one of those decisions that seem simple until you actually compare providers properly — the headline percentage rate rarely tells the full story once you factor in fixed fees, monthly costs, settlement speed, and contract terms. Get it wrong, and it can cost a growing e-commerce business real money over a year, not just a few pence per transaction.
This guide compares the main UK payment gateway options for 2026, with real published rates, so you can choose confidently rather than defaulting to whichever name you've heard most often.
If you're building or upgrading an online store, our complete e-commerce development guide covers the broader picture this fits into — including a real example of a platform we built integrating multiple payment gateways.
What a Payment Gateway Actually Does
A payment gateway is the technology that securely captures a customer's card details on your website or app and transmits them to the relevant bank or card network for authorisation — allowing you to accept online payments safely, without ever handling sensitive card data directly on your own servers.
Top UK Payment Gateway Providers Compared
Stripe: One of the most widely used gateways among UK online businesses, particularly e-commerce and software companies. Charges around 1.5% + 20p per standard UK card transaction, with no monthly fee, and integrates with a very wide range of e-commerce platforms and custom-built websites. An additional currency conversion fee typically applies for non-UK cards. Well-suited to businesses that want flexibility and strong developer tools, or a fully custom checkout experience.
PayPal Checkout offers one of the lowest standard UK card rates, around 1.2% + 30p, with no monthly fee. A strong option for businesses that want a well-known, trusted checkout brand with minimal setup effort, particularly useful for smaller stores without in-house development resources.
Square Charges around 1.4% + 25p for UK cards online (rising for non-UK cards), with no monthly fee. Particularly strong for businesses selling both online and in person, since Square's system keeps one product catalogue in sync across a website and a physical till — a genuinely useful feature for retail or hospitality businesses operating both channels.
Worldpay: A long-established UK provider, often chosen by businesses that need both online and in-person payment capability under one contract. Commonly offered on fixed-term contracts rather than pure pay-as-you-go, which can mean better rates at higher transaction volumes, but with early termination fees to be aware of if your needs change.
Adyen uses interchange-plus pricing (a small margin on top of the actual card network cost) plus a small per-transaction fee, which tends to become more cost-effective as transaction volume grows. Generally a better fit for larger or fast-scaling businesses than small or early-stage stores.
GoCardless: Not a card gateway but a bank-payment (Direct Debit/Open Banking) provider, operating natively within the UK banking system. A strong option specifically for subscription or recurring-billing businesses, since it avoids card expiry and failed-payment issues common with card-based recurring billing.
Real Cost Comparison Example
Using a typical £50 UK card transaction as an example: Stripe (1.5% + 20p) and Square (1.4% + 25p) work out very similarly at this transaction size, though Stripe becomes slightly cheaper on lower-value transactions due to its smaller fixed fee, while Square's lower percentage rate can pull ahead on higher-value transactions. This is a useful reminder that the "cheapest" gateway genuinely depends on your typical order value, not just the headline percentage.
Why Many UK Businesses Use More Than One Gateway
It's increasingly common for growing e-commerce platforms to integrate more than one payment gateway rather than relying on a single provider. This adds flexibility around fees, supports different transaction types (online versus in-person, for example), and provides redundancy if one provider goes down. This is exactly the approach we took with DropApp, a multi-store grocery ordering platform we built that integrates both Stripe and Worldpay, giving stores flexibility rather than being locked into a single provider's fees or feature set.
What to Actually Compare (Beyond the Headline Rate)
- The true blended rate — add the fixed pence fee, any currency conversion charges, and monthly costs to the percentage rate to get a realistic picture, not just the advertised headline figure
- Contract terms — pay-as-you-go providers suit newer or smaller businesses better, while fixed-term contracts can offer lower rates at volume but come with exit fees if your needs change
- Integration effort — some gateways offer simple, no-code plugins for platforms like Shopify or WooCommerce, while others require proper developer integration for a fully custom checkout
- Settlement speed — most UK gateways settle within one to three working days; some offer faster payouts for an additional fee, which matters more for cash-flow-sensitive businesses
- Multi-currency support — relevant if you sell beyond the UK, since providers vary significantly in how well they handle multiple currencies and local payment methods
How to Choose the Right Gateway for Your Business
- Simple single-store setup, no developer resources → PayPal Checkout or Square, both offer low-effort setup with no coding required
- Custom-built website or app, want full control over the checkout experience → Stripe, given its strong developer tools and flexibility
- Selling both online and in-store → Square or Worldpay, both designed to keep online and in-person sales in sync
- Subscription or recurring billing business → Consider GoCardless alongside a card gateway, since bank-payment methods avoid the card-expiry and failed-payment issues common with subscriptions
- High transaction volume, scaling fast → Adyen's interchange-plus pricing typically becomes more competitive at scale
Building or Upgrading Your Online Store's Payment Setup?
Choosing the right payment gateway (or combination of gateways) depends on your specific business model, order values, and growth plans. Our E-commerce Development team can help you integrate the right setup properly, whether that's a single gateway or a multi-gateway system like the one we built for DropApp.
Get in touch to talk through your project, or read our full e-commerce development guide for the broader picture.
Payment gateway fees and terms change over time and vary by business type and volume. Figures in this guide reflect published rates as of 2026 — always confirm current pricing directly with providers before making a decision.
