BNPL Explained: How Buy Now, Pay Later Works and Who Is Actually Winning

What BNPL Actually Is

Buy now, pay later is a form of short-term consumer credit offered at the point of purchase. Instead of paying the full price immediately or reaching for a credit card, the consumer splits the payment into equal instalments spread over weeks. The canonical product is pay-in-3 or pay-in-4: three or four payments, each a few weeks apart, often with no stated interest rate. For a £120 jacket, that is three payments of £40, the first taken at checkout.

The framing ("interest-free," "no credit check," "just split it") positions BNPL as a payment method rather than a credit product. That distinction matters commercially and legally, and it is precisely what regulators are now pulling apart. Someone pays for the credit. That someone is not the consumer, at least not up front.

Three Business Models That Have Been Conflated

"BNPL" has become a catch-all label applied to three structurally different products. Understanding which one you are looking at matters: they carry different economics, different default profiles, and different regulatory exposure.

Short-term interest-free instalments. The consumer splits a purchase over several weeks with no stated interest. Klarna's "Pay in 3" and Afterpay's "Pay in 4" are examples. Revenue can include a merchant fee and, depending on the provider and market, late fees or other income. Commercial rates are negotiated and should be checked in the current merchant agreement rather than represented by a universal percentage.

Longer-term instalment loans. 3–36 month terms, often with a stated APR. Affirm in the US operates this model, typically presenting it as a "buy now, pay over 12 months" option at checkout. Some offers are 0% promotional rate, subsidised by the merchant for specific campaigns; others carry interest. These products are substantively closer to a traditional personal loan than to a payment deferral: the consumer is borrowing money and, in many cases, paying interest. Affirm's economics look less like Klarna and more like a specialist consumer lender.

Revolving credit hybrids. Some BNPL products operate closer to a charge card with a refreshing credit limit. Zilch (UK) structured itself this way. Regulation tends to catch these as consumer credit products from the outset, since the revolving structure is harder to argue away as a payment method. These are the rarest of the three models in the mainstream market.

How the Economics Work

BNPL merchant pricing cannot be compared directly with regulated interchange alone: a merchant's card acceptance price also includes acquiring, scheme and service components. Providers market BNPL on conversion and average-order-value benefits, but those claims are commercially interested and vary by merchant. A retailer should compare the full incremental fee with measured incremental sales, returns, fraud, bad customer outcomes and cannibalisation in a controlled test.

A BNPL provider can earn merchant fees, late fees where the product and rules permit them, and interest on longer-term products. The allocation of funding, refunds and credit loss depends on the provider's merchant agreement and product structure; it should not be assumed that every merchant is paid immediately or that the lender bears every loss. A merchant evaluating BNPL should test the contractual allocation alongside the customer outcome.

The model is sensitive to funding costs, credit losses and customer repayment performance. Those inputs should be assessed from the provider's current disclosures and the merchant's own portfolio data, rather than inferred from a sector-wide headline.

The Key Players

Klarna (Sweden) reported 119 million active consumers and more than one million merchants in its Q1 2026 results^[1]. Those are company-reported network measures, not independently audited measures of customer engagement or profitability. Klarna's valuation and ownership history also show how sensitive credit businesses are to funding conditions and market expectations.

Afterpay (Australia) is best known for a pay-in-4 model and operates as Clearpay in the UK. Affirm (US) offers longer-term instalment options alongside promotional-rate products. The labels are useful starting points, but a customer should compare the particular lender, agreement, cost and protections offered at checkout rather than infer them from a provider name.

Provider availability, product terms and ownership change frequently. Use the lender's current pre-contract information, permissions and product disclosures when making a comparison.

The Consumer Risk and the Credit File Problem

The "no credit check" claim requires careful unpacking. The search and affordability assessment used by a lender depend on the product and provider. A soft search is different from a hard search, and neither label alone establishes what repayment data will later be shared or how another lender will use it.

Consumers can hold obligations with more than one provider, while the information visible to a particular lender may be incomplete. The practical risk is over-commitment: customers should review all scheduled repayments, not rely solely on what appears in a credit-file view.

Whether a particular agreement appears on a credit file, and how a lender uses it, varies. The FCA started regulating in-scope third-party Deferred Payment Credit on 15 July 2026^[2]; regulated lenders must check that a customer can afford to repay. This does not create a universal requirement for every BNPL agreement to appear with every credit-reference agency, and the FCA's credit-information remedies remain proposals in CP26/7.

For AI underwriting systems that pull credit bureau data, the absence of BNPL has been a consistent blind spot. As that data arrives, affordability models will need updating, and some consumers who currently appear low-risk on a bureau pull will look materially different once their BNPL stack is visible.

Regulation: The Exemption That Is Closing

The rapid growth of short-term BNPL in the UK was enabled by a specific regulatory gap. Interest-free deferred-payment agreements repayable in no more than 12 instalments over no more than 12 months could rely on the exemption in Article 60F(2) of the Financial Services and Markets Act 2000 (Regulated Activities) Order 2001. Third-party BNPL lenders therefore operated outside the consumer-credit lending permissions that apply to conventional loans, although other consumer-protection law still applied.

That position changed on 15 July 2026. Under FCA Policy Statement PS26/1^[3], lenders offering in-scope third-party Deferred Payment Credit are now regulated and need authorisation or temporary permission where eligible. The rules cover pre-contract information, affordability, support and access to redress. Merchant-provided DPC and DPC broking remain outside this regime, so "all BNPL is regulated" would be an overstatement.

At EU level, Directive (EU) 2023/2225^[4] brings many third-party BNPL arrangements within the consumer-credit framework while retaining defined exclusions for some supplier deferrals. Member states had to adopt implementing measures by 20 November 2025 and are to apply them from 20 November 2026. The exact perimeter still depends on the provider and product structure.

Regulatory change can alter a provider's systems, permissions and customer-support obligations. Its commercial effect will vary by provider, product and market; it should not be reduced to a simple prediction about which firms will win.

The Open Banking Alternative

Open-banking data can be used, with the customer's permission, as one input to an affordability assessment. It is not automatically a substitute for credit-reference data, and the lawful basis, data use and explanation depend on the lender and the assessment.

B2B BNPL: The Next Frontier

The same structural logic driving consumer BNPL applies in business-to-business trade. B2B buyers want to pay later; B2B sellers want cash now. Traditional trade credit terms (net-30, net-60) involve manual credit decisions, paper processes, and significant working capital strain on the seller. Automating that workflow (underwriting the buyer's creditworthiness programmatically, paying the supplier immediately, and collecting from the buyer over terms) is a sizeable opportunity.

Embedded trade-credit products can use business bank data, company records and trade-credit histories as underwriting inputs. The agreement and customer type matter: providers should classify the customer and product rather than treating every business transaction as automatically outside consumer-credit protections.

Who Is Actually Winning

There is no reliable single answer to who is winning. Providers face different funding, loss, merchant-acquisition and regulatory costs. A comparison should use current, like-for-like disclosures rather than a general ranking.

For merchants, the decision is an experiment: compare the full fee, incremental completed sales, returns, fraud and customer outcomes against a control group. For consumers, BNPL remains borrowing. Check the agreement, repayment dates, late-fee terms and whether the lender is authorised or has temporary permission where the product is in scope.

Sources and methodology: UK regulatory claims were checked against FCA PS26/1, the FCA's consumer BNPL guidance^[2] and the Deferred Payment Credit Order 2025^[5]; EU scope and dates were checked against Directive (EU) 2023/2225. Merchant pricing, conversion and credit-file treatment vary by agreement, provider and bureau and should not be inferred from a sector-wide headline.