If you run a small business in the UK, the payment gateway you choose affects your margins every single day. A 1-point difference in transaction fees sounds small until you’re processing £10,000 a month and watching £100 disappear before you’ve paid for stock, wages or rent.
What Is a Payment Gateway (and Do You Actually Need One?)
A payment gateway is the software that securely captures a customer’s card or bank details at checkout and passes them to the banking network for approval. It’s the digital equivalent of a card machine for your website, app, or invoice link.
You need one if you take payments online, over the phone, or via invoice without a customer physically present. If you only sell face-to-face, a card reader with a built-in payment facility (like Square or SumUp) may cover you without a separate gateway.
Payment Gateway vs. Payment Processor: The Crucial Difference
A payment gateway captures and encrypts the payment data. A payment processor moves the money between the customer’s bank, the card scheme (Visa, Mastercard, Amex) and your merchant account. Many UK providers, including Stripe, Square and PayPal, bundle both functions into one product, which is why small businesses rarely need to shop for them separately. Larger merchants using Worldpay or Opayo sometimes run a gateway and a separate acquiring bank relationship, which is where contracts get more complex.
Head-to-Head Fee Comparison: The Top UK Gateways at a Glance
| Provider | UK Card Rate | Monthly Fee | Contract Term | Best For |
|---|---|---|---|---|
| Stripe | 1.5% + 20p (UK cards); up to 3.25% + 20p (non-EEA) | £0 | None — rolling | Custom checkouts, developer-led builds |
| GoCardless | 1% + 20p per Direct Debit, capped at £4 | £0 (Standard plan) | None — rolling | Recurring invoices and subscriptions |
| Square | 1.75% in person; 1.4% + 25p online (UK cards) | £0 (Free plan) | None — rolling | Retail and hybrid in-person/online sales |
| Worldpay | From ~1.5% (under £75k turnover); from 0.75% + 4.5p (over £75k) | Roughly £20–£50+ | Typically 18 months | High-volume merchants wanting negotiated rates |
| Opayo | Blended ~1.5%–2.5% via Elavon acquiring | From roughly £20–£25 (gateway only) | Typically 12–24 months | Predictable-volume SMBs, especially on Sage |
| PayPal for Business | 2.9% + 30p domestic; higher for cross-border | £0 | None — rolling | Instant buyer trust at checkout, fast setup |
All figures are exclusive of VAT and based on published standard rates. Confirm current pricing directly with each provider before signing up, as rates and thresholds shift over time.
Deep-Dive Profiles of the Best UK Payment Gateways
Stripe: Best for Developer Flexibility and Custom E-Commerce
Stripe charges 1.5% + 20p for UK-issued cards, rising to 3.25% + 20p for cards issued outside the UK and EEA. There’s no monthly fee and no setup cost on the standard plan. Currency conversion adds roughly 2% on top when you sell in a currency other than the one you settle in.
Stripe suits businesses that want a fully custom checkout or that sell through a bespoke website rather than an off-the-shelf platform. It integrates with WooCommerce, Shopify, and most modern e-commerce stacks, plus accounting tools like Xero and QuickBooks. The trade-off is that refund fees aren’t returned to you, and chargebacks cost a flat £20 whether you win or lose the dispute. If you’re weighing Stripe against a more consumer-familiar checkout, our detailed Stripe vs PayPal comparison breaks down both side by side.
GoCardless: Best for Recurring Invoices, Subscriptions, and Direct Debit
GoCardless doesn’t process card payments at all. It specialises in Bacs Direct Debit and open banking collections, pulling payments straight from a customer’s bank account. Standard pricing is 1% + 20p per transaction, capped at £4, with no monthly fee.
That cap makes GoCardless dramatically cheaper than cards for higher-value invoices. A £2,000 invoice costs £4 through GoCardless versus roughly £30–£58 through a card gateway. It’s built for subscription billing, membership fees, and B2B invoicing, and it plugs directly into Xero, QuickBooks and Sage. The catch: Direct Debit failures take longer to resolve than a declined card, and international collections add a further 1%.
Square: Best for Hybrid (Omni-Channel) Retail and Rapid Setup
Square charges a flat 1.75% on every in-person card payment, regardless of card type, with a free card reader and no monthly fee. Online payments through Square’s checkout cost 1.4% + 25p for UK cards, rising to 2.5% + 25p for cards issued abroad.
This makes Square a strong fit for shops, cafés, and market traders who take payments both in person and online through the same dashboard. Inventory, receipts, and basic reporting come bundled in for free. The flat rate never drops with volume on the free plan, so once you’re processing above roughly £15,000–£20,000 a month, a negotiated merchant account may undercut it.
Worldpay: Best for High-Volume Merchants Seeking Custom Pricing
Worldpay uses interchange-plus or blended pricing that’s negotiated per merchant rather than published as a flat rate. Businesses under £75,000 in annual card turnover typically pay around 1.5% per transaction on personal UK debit and credit cards; above that threshold, rates can drop to around 0.75% + 4.5p. Expect a monthly account fee of roughly £20–£50, plus separate charges for the payment gateway and PCI compliance.
Worldpay makes sense once your card turnover is firmly into five or six figures a year and you have the negotiating leverage to bring the blended rate down. For an early-stage or seasonal small business, the 18-month standard contract and fixed monthly costs are usually overkill.
Opayo (formerly Sage Pay): Best for Predictable Flat-Rate Pricing and Strict Security
Opayo, owned by Elavon, is one of the UK’s longest-running payment gateways and remains popular with businesses already on Sage accounting software. The gateway itself starts from roughly £20–£25 a month, with a separate acquiring transaction fee that typically blends to 1.5%–2.5% depending on your card mix.
Its main strength is built-in fraud screening and PCI DSS Level 1 compliance handled largely on Opayo’s side, which reduces the compliance burden on your own systems. Contracts commonly run 12–24 months, so this suits businesses with steady, predictable transaction volumes rather than early-stage or highly seasonal traders.
PayPal for Business: Best for Instant Consumer Trust at Checkout
PayPal charges 2.9% + 30p on standard UK domestic transactions, rising to around 3.4%–4.4% plus 30p for cross-border payments from Europe and beyond. There’s no monthly fee, and setup takes minutes.
The appeal isn’t the price, it’s recognition. Many UK shoppers trust a PayPal button at checkout more than an unfamiliar card form, which can reduce cart abandonment even though the fee is higher than Stripe or Square. It suits businesses just starting out, or those selling to a broad consumer audience where checkout familiarity matters more than shaving off a fraction of a percent.
Other names worth knowing if none of the above quite fit: Mollie and takepayments serve similar SME territory to Stripe and Opayo, while Adyen and Checkout.com are built for larger, high-volume international merchants rather than small UK businesses just starting out.
The Hidden Cost Trap: What to Watch Out for Beyond Transaction Fees
The headline rate on a pricing page rarely reflects what you actually pay each month. These four areas catch small businesses out most often.
Post-Brexit Cross-Border and International Card Fees
Before Brexit, UK businesses treated EU and UK cards as roughly equivalent for pricing purposes. That’s no longer accurate. Since the UK left the EEA regulatory framework, several major processors now treat EU-issued cards as international rather than domestic, which can push the rate from around 1.5% up to 2.5% or higher on the same sale.
If you invoice clients in Ireland, Germany, or France, check whether your gateway’s contract defines “domestic” as UK-only or UK-plus-EEA. That single clause can change your effective rate on European sales by a full percentage point or more.
Refund Fees and Non-Refundable Processing Costs
Most gateways refund the customer’s money but keep their own processing fee. On Stripe, PayPal and Square, a £100 refund still costs you the original percentage fee, even though the customer gets their full £100 back. If your business has a high return rate, model this cost separately; it rarely appears in headline marketing but adds up fast for fashion, homeware, or subscription businesses with regular cancellations.
Chargeback Penalties and Rolling Reserves
A chargeback happens when a customer disputes a payment directly with their card issuer rather than requesting a refund from you. Gateways typically charge a flat fee, often £15–£25, whether you win or lose the dispute. If your chargeback rate climbs above roughly 0.5–1%, some providers will impose a rolling reserve: a percentage of your revenue held back for weeks as security against future disputes. This can seriously disrupt cash flow for a small business operating on thin margins.
Contract Lock-ins and Account Suspension Risks
Merchant forums and Reddit threads are full of businesses describing sudden account freezes, usually triggered automatically when transaction patterns look unusual to a fraud algorithm: a sharp revenue spike, a large one-off sale, or a change in average order value. These freezes can hold funds for days or weeks while the provider reviews the account, and they’re rarely announced in advance.
Three practical habits reduce the risk:
- Keep clear, accessible records of invoices, delivery confirmations and customer communications for every large transaction.
- Notify your provider in advance if you expect a sudden spike, such as a seasonal launch or a large B2B order.
- Read the contract term before signing. Rolling monthly agreements (Stripe, Square, GoCardless, PayPal) let you leave quickly if a provider isn’t working out; fixed 12–18 month terms (Worldpay, Opayo) usually carry an early termination fee.
How to Match a Gateway to Your Specific Business Model
The cheapest gateway on paper isn’t always the cheapest gateway for your business. Here’s how the maths actually plays out for a small business processing £5,000 a month across 200 orders (an average order value of £25):
| Provider | Approx. Monthly Cost |
|---|---|
| GoCardless (Direct Debit) | £90 |
| Worldpay (negotiated) | ~£100 |
| Stripe | £115 |
| Square (online) | £120 |
| Opayo (gateway + blended rate) | ~£125 |
| PayPal | £205 |
| Open Banking / Pay by Bank | £25–£60 |
The gap between the cheapest and most expensive option here is over £150 a month, or nearly £1,900 a year, on identical revenue. That’s real money for a small business.
Scenario A: The Online E-Commerce Shop
For product-based online stores, Stripe or Square online checkout usually wins on flexibility and platform integration. If most of your customers are in the UK, the domestic rate keeps costs predictable. Choosing the right storefront matters just as much as the gateway itself; see our guide to the best e-commerce platforms for UK small businesses if you’re still deciding on Shopify, WooCommerce, or an alternative.
Scenario B: Service-Based Businesses and Freelancers (Evaluating “Pay by Bank” and Open Banking)
If you invoice clients rather than selling products at checkout, card fees are often the wrong tool entirely. Open Banking, sometimes marketed as “Pay by Bank” or Instant Bank Pay, moves money directly between bank accounts using Faster Payments, bypassing card networks altogether. Costs typically run from a flat 20–50p per transaction or as little as 0.1%–1%, against 1.5%–2.9% for cards. On a £2,000 invoice, that’s the difference between roughly £2 and £50–£58. The trade-off is no chargeback protection for the customer, so it suits trusted, invoiced relationships more than anonymous online retail.
Scenario C: SaaS and Subscription-Based Brands
For recurring billing, GoCardless’s capped Direct Debit fee usually beats a percentage-based card fee once your average subscription value climbs above roughly £30–£40 a month. Card failure rates also run 10–15% versus around 2% for Direct Debit, so fewer failed renewals means less time chasing customers. Many subscription businesses run both: cards for the first payment (instant, familiar) and Direct Debit for ongoing billing (cheaper, more reliable).
Frequently Asked Questions (FAQ)
What is the cheapest payment gateway in the UK?
For card payments, GoCardless’s Direct Debit rate (1% + 20p, capped at £4) is the cheapest for invoiced or recurring payments. For genuine card transactions, Stripe’s 1.5% + 20p domestic rate is typically the lowest published headline rate. For one-off invoices, Open Banking payments are usually cheaper than either.
Do I need a separate merchant account with Stripe?
No. Stripe bundles the merchant account function into its own platform, so you don’t need to apply for one separately. This is different from providers like Worldpay, where a distinct acquiring relationship sometimes sits behind the gateway.
How long does it take to get payouts in the UK?
Most gateways settle to your UK business bank account within 1–2 working days. Square and Stripe typically pay out the next working day as standard; instant transfer options exist on some platforms for an added fee. Choosing the right account to receive these payouts matters too, our guide to the best business bank accounts in the UK covers what to look for.
Is Direct Debit cheaper than card processing for small businesses?
Usually, yes, for invoices above roughly £30–£40. GoCardless’s fee is capped, so the percentage effectively shrinks as the transaction value rises. Card fees stay proportional to the sale, so they get relatively more expensive as order values climb.
Do payment gateway fees include VAT?
No. Published rates from Stripe, Square, GoCardless, Worldpay, Opayo and PayPal are all shown exclusive of VAT, which is added at the UK standard rate. If you’re not yet VAT-registered, it’s worth understanding the VAT registration threshold before this becomes relevant to your pricing.
What happens if my payment provider freezes my account?
Funds are typically held while the provider reviews recent transactions for fraud risk, which can take days to several weeks. Keeping clear invoices, delivery evidence and customer records for large or unusual transactions is the most effective way to resolve a review quickly. Reviewing your small business insurance cover is also worth doing, since some policies help with cash-flow disruption from this kind of dispute.
