Choosing the right B2B SaaS payment gateway is one of the highest-stakes decisions you will make as a UK founder. A B2B SaaS payment gateway UK businesses rely on must handle recurring revenue, decide how quickly cash reaches your account, and set the security standard your customers experience every month. Get it wrong and you face failed renewals, compliance gaps, and margin erosion that is hard to undo.
According to Women in Business: Key UK Facts, women-led businesses are a growing force across the UK economy, yet many founders still choose software infrastructure without a UK-specific checklist. This guide gives you six practical checks to use when comparing payment gateways for a B2B SaaS business in 2026.
Six checks before choosing a B2B SaaS payment gateway UK
Use these six checks to shortlist providers and protect your revenue.
1. FCA authorisation and UK regulatory cover
Any provider that moves money in the UK must be authorised or registered with the Financial Conduct Authority (FCA) under the Payment Services Regulations 2017. This is the UK implementation of the EU’s PSD2 framework and it governs payment initiation, account information services, and the safeguarding of customer funds.
Before you sign, ask the provider for its FCA reference number and check it on the FCA Financial Services Register. If the gateway is not FCA-authorised, your client funds may not be safeguarded under UK rules and your own business could carry more liability than you expect.
2. PCI DSS v4.0 compliance
The Payment Card Industry Data Security Standard (PCI DSS) version 4.0 became mandatory on 31 March 2024, per the PCI Security Standards Council. If your gateway stores, processes, or transmits card data, both you and the provider must meet these requirements.
Most established UK gateways now offer a hosted checkout or tokenisation service that keeps card data off your servers. This reduces your PCI scope, but it does not remove it entirely. Ask for the provider’s Attestation of Compliance (AOC) and confirm which PCI DSS v4.0 level applies to your setup.
3. Strong Customer Authentication (SCA)
SCA applies to customer-initiated electronic payments in the UK. It requires two of three authentication elements: something the customer knows, owns, or is. For B2B SaaS businesses, this matters because a failed authentication can block a quarterly or annual renewal.
Check whether the gateway supports exemptions that are relevant to B2B subscriptions, such as merchant-initiated transactions, low-value exemptions, and subscription exemptions for recurring payments. Stripe, GoCardless, Adyen and other major providers publish SCA exemption logic, but the rules differ by card scheme and by whether your customer is UK-based or EU-based.
4. Fee structure and VAT handling
Gateway fees typically include a percentage per transaction, a fixed fee per payment, monthly platform fees, and charges for refunds, chargebacks, or international cards. A difference of 0.5% may look small, but on £500,000 of annual recurring revenue it is £2,500 a year straight off your margin.
You also need to understand how VAT is handled. If your SaaS turnover crosses the £85,000 VAT registration threshold (frozen at this level until April 2028, per HMRC guidance issued after the 2024 Spring Budget), your invoices must show VAT correctly. Some gateways can add VAT automatically; others push the burden onto your accounting software. If you sell to EU customers, you may also need to account for VAT MOSS or One-Stop-Shop rules.
For more on tax obligations, see our Making Tax Digital Sole Trader: 2026 Checklist for Women.
5. Multi-currency and Open Banking support
B2B SaaS customers often pay in US dollars, euros, or other currencies. A gateway that supports multi-currency pricing and local acquiring can reduce foreign exchange fees and improve authorisation rates. Local acquiring means the transaction is processed through a bank in the customer’s country, which card issuers treat more favourably.
Consider whether Open Banking account-to-account payments make sense for your model. Providers such as GoCardless, Stripe and Truelayer offer bank-to-bank options that can cut card fees and reduce chargeback risk. Open Banking payments are regulated under the Payment Services Regulations 2017 and can be particularly useful for high-value B2B invoices.
6. Reporting and accounting integrations
Your payment gateway should feed clean data into your accounting software. Look for native integrations with UK-friendly platforms such as Xero, QuickBooks, Sage, or FreeAgent. The integration should reconcile payouts, fees, and refunds automatically.
Strong reporting also helps you spot churn signals. A gateway that shows failed payment recovery rates, subscription lifecycle data, and revenue recognition reports will save hours each month. If you are planning to raise investment, clean revenue data from your gateway is one of the first things a due diligence team will request.
What the fees really mean for your margins
It is easy to compare headline rates and miss the total cost. Build a simple model based on your expected monthly transaction volume, average transaction value, and the mix of UK and international cards. Include monthly platform fees, chargeback fees, and the cost of any fraud or recovery tools.
Remember that corporation tax is now 25% for profits above £250,000 (HMRC, from April 2023), with a small profits rate of 19% for profits up to £50,000 and marginal relief between the two. Every pound saved on payment fees flows through to post-tax profit at these rates.
Practical action steps for UK founders
- Confirm the provider is on the FCA Financial Services Register.
- Request a current PCI DSS v4.0 Attestation of Compliance.
- Test the SCA flow for new subscriptions and recurring renewals.
- Model total fees for 12 months using your own transaction data.
- Check multi-currency pricing and local acquiring for your main markets.
- Verify the accounting integration reconciles payouts, fees, and refunds.
Final thoughts on your payment gateway choice
A B2B SaaS payment gateway is not just a checkout tool. It affects your cash flow, compliance, customer experience, and valuation. By checking FCA authorisation, PCI DSS v4.0 status, SCA handling, fee structure, multi-currency support, and reporting before you sign, you choose a B2B SaaS payment gateway UK founders can build on.
For more on funding and scaling a UK business, read our guide to British Business Bank: New Funding Rules for Women Founders.
