Shop Pay Installments and BNPL Compliance for UK Shopify Merchants After the FCA Rule Change

If your Shopify store offers Klarna, Clearpay or Shop Pay Installments at checkout, the rules changed on 15 July 2026. That was the day the Financial Conduct Authority (FCA) started supervising deferred payment credit, the regulator's name for interest-free buy now pay later. Until then, splitting a basket into three or four payments sat outside UK consumer credit law. It no longer does, and BNPL regulation for Shopify UK merchants is not just the lender's problem.

Most of the articles you will find on this subject are app comparisons written before the change. They tell you which BNPL provider has the nicest widget. None of them tell you what you, the merchant, are now responsible for on your own product pages, banners and emails. This one does.

What the FCA buy now pay later rules actually changed

The FCA published its final rules in February 2026 (policy statement PS26/1) and they took effect on 15 July 2026. From that date, interest-free credit repaid in twelve or fewer instalments within twelve months, provided by a third-party lender to finance a purchase, is a regulated product. Lenders now have to run affordability checks, give clear pre-contract information, handle complaints properly, and give customers access to the Financial Ombudsman Service. The FCA's own page on regulating buy now pay later is the primary source and worth ten minutes of your time.

Three things are out of scope, and they matter for how you read everything else. Credit you provide directly yourself (your own instalment plan, no third-party lender) is not regulated. Agreements signed before 15 July 2026 stay unregulated. And merchants who simply introduce customers to a lender are not treated as credit brokers, so you do not need FCA authorisation to offer Klarna or Clearpay. Interest-bearing instalment plans were already regulated before July, so if you have been offering those through Shop Pay Installments the lender was already supervised for that part.

The scale explains why the regulator moved. Experian's analysis of 2025 found more than 100 million BNPL transactions in the UK, worth over £7 billion, across roughly 8.5 million customers, with an average basket around £60. Equifax put BNPL at 22% of the UK retail finance market by April 2026, up from 15% at the start of 2023. For a lot of Shopify stores, that is a meaningful slice of checkout.

Why Shop Pay Installments compliance in the UK is different from the US

Shop Pay Installments launched in the UK in late 2025, with Affirm UK as the lender and Shopify International acting as its appointed representative. It needs Shopify Payments and Shop Pay switched on, and UK shoppers can be offered interest-free or interest-bearing monthly plans. Affirm UK is FCA-authorised, which is good news: the regulated party is already in the regime and Shopify's checkout and payment flow were updated by Shopify, not by you.

The catch is that the US playbook for promoting Shop Pay Installments does not transfer. In the US, merchants write their own 'as low as £X a month' copy without much thought. In the UK, that same sentence is now a financial promotion for a regulated credit product. Section 21 of the Financial Services and Markets Act says an unauthorised business cannot communicate a financial promotion unless an authorised firm has approved it. You are the unauthorised business. The lender is the authorised firm. That is the whole compliance picture for a merchant in one line.

What lands on the merchant, not the lender

Klarna's UK partner guidance spells this out more bluntly than the FCA does. Only its pre-approved downloaded assets and its official on-site messaging count as approved. Edit the wording, write your own banner, or build a custom widget, and that approval is gone. Klarna goes as far as warning that partners who publish unapproved financial promotions risk committing a criminal offence. Clearpay and PayPal operate on the same legal basis even where their guidance is less explicit, because the law applies to the promotion, not to the brand.

In practice, your exposure sits in five places:

Product page price splits. A custom Liquid snippet that divides the price by three and prints it under the add-to-cart button is a financial promotion you wrote yourself.Homepage and collection banners. 'Spread the cost with Klarna' is fine if it is the lender's approved asset. Your designer's version with tweaked copy is not.Email and SMS. Any campaign that mentions pay later, pay in 3 or instalments is in scope. Marketing automation that was set up in 2023 and never reviewed is a common source of trouble.Influencer and affiliate content. If you brief creators to mention BNPL, their content is a promotion you caused to be communicated.Stale regulatory wording. Pages that still say the credit is 'unregulated' or 'not regulated by the FCA' are now simply wrong, and some lenders have changed their firm reference numbers in the process.

There is a second, quieter duty. Lenders must now pass mandatory customer information down to merchants, and merchants are expected to surface it in the journey. If your theme hides the lender's messaging block because it looked cluttered, or a page builder app overrode it, you may be stripping out text the lender needs shown.

A practical audit of your Shopify BNPL messaging

This is the checklist we run on client stores. It takes a senior developer a few hours on a typical theme, longer if there is a page builder involved.

List every place BNPL is mentioned: theme sections, product templates, metafield-driven copy, email flows, SMS, paid ads, social bios and creator briefs. Search the theme code for Klarna, Clearpay, Afterpay, Affirm, instalment, installment and 'pay in'.For each one, decide whether it is the lender's official asset or on-site messaging script, or something your team wrote. Anything in the second group either gets replaced with the official asset or sent to the lender for written approval.Check the lender's on-site messaging is actually rendering. Shopify's native Shop Pay Installments banner, Klarna's On-Site Messaging and Clearpay's widget are injected by the lender and update automatically. Confirm nothing in your theme, consent banner or speed optimisation app is blocking them.Remove any wording that calls the product unregulated, and check firm reference numbers and footer disclosures match what the lender now publishes.Review the checkout itself. On Shopify this is mostly handled for you, but if you use checkout extensions or a custom thank-you page, make sure none of them add their own instalment copy.Get written confirmation from each BNPL provider that they hold FCA permission or were in the temporary permissions regime, and keep it on file.Brief customer service. Complaints about a BNPL agreement can now go to the Financial Ombudsman. Your team should know how to route a complaint to the lender rather than trying to resolve it informally.

If you run a Shopify support and maintenance retainer, this is exactly the kind of job it exists for. It is not glamorous work, but it is the sort of thing that goes wrong when nobody owns the theme.

Does regulated BNPL hurt conversion?

Honest answer: slightly, for some baskets, and probably less than you fear. Affordability checks add friction for a small share of shoppers who would previously have been approved instantly. Clearer pre-contract information adds a screen. On the other hand, trust goes up. Shoppers who were nervous of an unregulated product now have ombudsman protection, and the lenders' approved messaging is designed to convert.

What we would caution against is overreacting by hiding BNPL to avoid the compliance work. Instalment messaging on the product page is one of the few trust signals that measurably moves conversion, especially on baskets above £80. Ripping it out to dodge a few hours of audit is a poor trade. Keep it, use the lender's assets, and test placement rather than copy.

You cannot A/B test your way round a financial promotion rule. Test where the lender's message sits, not what it says.

That said, BNPL is rarely the thing holding a store back. In our experience across a hundred-plus Shopify projects, most brands with real traffic do not have a traffic problem, they have a conversion problem, and it lives in the product page and the checkout flow rather than the payment method list. BNPL compliance is housekeeping. Conversion rate optimisation is the growth lever.

What UK and Scottish merchants should do this month

The rules have been live since July, so the question is no longer whether to prepare but whether you have already drifted out of line. Run the audit above. Replace anything home-made with the lender's approved assets. Fix the regulatory wording. Then get back to the work that actually grows revenue.

We are a senior-only Shopify team in Glasgow with 12 years behind us, and we fold checks like this into the monthly work on our Conversion Growth Retainer so clients do not have to think about them. If you would like a second pair of eyes on your BNPL messaging, or on why a well-trafficked store is not converting, get in touch and we will tell you straight what we see.