Buy Now Pay Later for UK Merchants: The Practical Guide

Provider Fit Guides · 6 min read

Buy Now Pay Later has moved from checkout novelty to mainstream expectation. Klarna alone has over 18 million UK users. Clearpay is embedded across fashion, beauty, and homeware. Customers increasingly choose where to shop based on whether BNPL is available.

For merchants, the question is no longer whether BNPL is worth considering. It is which provider is the right fit, what it actually costs, and how it interacts with your existing payment setup.

This guide covers all three.

How BNPL works from a merchant's perspective

The customer splits their purchase into instalments — usually three or four payments over six to eight weeks, interest-free. The merchant receives the full transaction amount upfront from the BNPL provider. The provider takes on all the credit and fraud risk.

This is the key structural point: you are not extending credit to your customer. You are selling to the BNPL provider, who then collects from the customer. If the customer misses payments, that is the provider's problem, not yours.

The tradeoff is the merchant fee. BNPL providers charge more than standard card processors, typically between 2% and 8% of the transaction value, because they are absorbing risk and offering a customer acquisition channel.

The performance impact: what the data says

The commercial case for BNPL is well established at this point.

• Conversion rates typically increase by 20% to 30% when BNPL is offered at checkout
• Average order value increases by around 41% compared to card-only checkouts
• Customers who use BNPL show 45% higher purchase frequency than those using traditional payment methods
• Cart abandonment drops significantly for transactions in the £50–£500 range

The mechanism is straightforward. Removing the immediate cost barrier converts high-intent browsers who would otherwise delay the purchase. The instalment structure makes the decision feel smaller, even when the total spend is not.

The major BNPL providers for UK merchants

The UK market is dominated by a small number of well-capitalised providers. Here is how they compare.

Klarna is generally the first integration to consider for UK merchants. Its consumer network is large enough that being listed on their merchant directory delivers meaningful referral traffic on top of the checkout conversion benefit.

Clearpay is the stronger choice if your target customer is under 35, fashion-oriented, or highly deal-driven. Their repeat purchase rates are notably high within their core demographic.

Which industries benefit most

BNPL was built for retail, but it has expanded far beyond it.

Retail and fashion

The original use case. High SKU counts, frequent purchases, and a customer base that shops by monthly budget rather than total price. BNPL consistently delivers the largest conversion uplift here.

Healthcare and elective procedures

Dental practices, cosmetic clinics, and veterinary services are increasingly using BNPL to make essential or elective care accessible. Research indicates that 71% of regular dental patients and 86% of pet owners would prefer BNPL over lump-sum payment. In these categories, BNPL directly reduces the number of customers who delay or decline treatment due to cost.

Travel and hospitality

Airlines, hotels, and travel agencies use BNPL to help customers secure bookings they would otherwise delay. Early booking rates become more accessible when the deposit or total cost can be split. This results in higher booking values and fewer last-minute conversions.

Home improvement and services

High-ticket, infrequent purchases where customers deliberate heavily. Contractors and home services providers that offer BNPL close larger projects faster. Customers who are willing to commit in principle are more likely to commit in practice when the upfront cost is reduced.

How BNPL affects your wider payment stack

This is where most merchant guides stop short.

Adding BNPL does not sit in isolation from your card processor. The two interact in ways that matter for approval, underwriting, and ongoing account stability.

Lower chargeback exposure

When a customer pays via BNPL, the BNPL provider is the merchant of record for that transaction. If there is a dispute, it sits with the BNPL provider, not you. This means your card processor sees a lower volume of chargebacks relative to your total sales volume — which improves your chargeback ratio and makes your account look lower risk during underwriting reviews.

For businesses operating close to Visa and Mastercard's chargeback thresholds, this can be a meaningful structural improvement.

Split revenue across methods

Businesses with 30–50% of sales through BNPL have demonstrably more stable card processing relationships. Providers are more comfortable when card volume is not the only payment method in use. Diversification reduces dependency and lowers perceived risk.

Underwriting perception

When payment providers underwrite your account, they look at your entire payment mix. A business using Klarna alongside a card processor signals a more mature, diversified payment setup — which generally leads to smoother approvals and more favourable terms.

BNPL regulation in the UK: what is changing

The UK BNPL market is entering a regulatory transition that merchants should be aware of.

The FCA has confirmed that unregulated BNPL products will come under its oversight. This will require providers to carry out affordability checks, give consumers clearer rights, and hold appropriate authorisations. The timeline has shifted several times, but the direction is clear.

For merchants, this means two things. First, smaller or less well-capitalised BNPL providers may exit the market or reduce availability as compliance costs rise. Second, the larger providers — Klarna, Clearpay, PayPal — are already aligned with FCA requirements and are unlikely to be affected materially.

Integrating with a regulated or FCA-ready BNPL provider now avoids future disruption to your checkout flow.

When BNPL does not make sense

BNPL is not the right option in every situation.

• Average transaction values below £30 — the conversion uplift rarely offsets the higher merchant fee at low ticket sizes
• B2B-only businesses — BNPL is a consumer product and does not map well onto business invoice cycles
• Subscription models requiring recurring automated billing — BNPL works for fixed instalments, not ongoing recurring charges
• Heavily regulated sectors — healthcare prescriptions, financial services, and gambling typically cannot use BNPL due to sector-specific restrictions

How to evaluate whether BNPL fits your business

Before approaching a BNPL provider, it is worth working through a few practical questions.

• What is your average transaction value? BNPL delivers the strongest returns between £50 and £500.
• What is your current checkout abandonment rate? If it is above 70%, BNPL can address a meaningful portion of that.
• What is your current chargeback ratio? If it is elevated, shifting volume to BNPL can help bring it down.
• Which BNPL provider's customer base most closely matches your own?
• Can your current payment provider support BNPL alongside card processing without integration conflicts?

Different providers have different risk appetites and onboarding criteria. A mismatch between your business type and the BNPL provider's underwriting model creates friction, even for straightforward businesses.

Finding the right overall payment setup

BNPL works best as part of a coherent payment strategy, not as a standalone addition. The providers that are most likely to support your business long-term are those whose risk appetite, approval criteria, and sector experience match where your business actually sits.

If you are evaluating your payment mix — whether that includes BNPL, card acquiring, or both — understanding your risk profile first gives you a much clearer picture of which providers are genuinely open to your business.

This content is informational and reflects general market conditions in the UK and EU. It does not constitute financial or legal advice. Merchant fee ranges and provider capabilities may change. Always verify current terms directly with any provider before integrating.