Buy Now Pay Later (BNPL): How It Works and What Businesses Need to Know

BNPL has become one of the fastest-growing payment methods in e-commerce — and one of the most debated in regulatory circles. For merchants evaluating BNPL as a checkout option, and for CFOs assessing the payment cost implications, understanding how the economics actually work is essential. This guide cuts through the marketing to show exactly how BNPL providers make money, what merchants pay, and what the regulatory landscape looks like in 2025.

How Does BNPL Work for Consumers?

The standard BNPL model is pay-in-4: the consumer pays 25% at checkout and the remaining 75% in three equal installments every two weeks, with no interest charged if payments are made on time. Providers like Afterpay, Klarna (Pay in 4), and Zip operate this model. A parallel model is point-of-sale financing (Affirm, Klarna Financing): longer-term loans of 3–36 months at APRs ranging from 0% (subsidized by the merchant) to 36%, competing with store credit cards.

The consumer experience is frictionless by design: a soft credit check (no hard inquiry that affects credit score) completes in under a second using real-time data signals — email age, device fingerprint, purchase history, and sometimes bureau data. Approval rates typically exceed 80% for standard pay-in-4. This frictionlessness is both the product’s appeal and regulators’ concern: consumers can accumulate BNPL obligations across multiple providers with no visibility to credit bureaus.

How Do BNPL Providers Make Money?

BNPL providers have three revenue streams. The largest is merchant fees — the 2–6% charged per transaction. For Afterpay, merchant fees accounted for over 70% of revenue historically. The second stream is late fees — typically $7–15 per missed payment, capped at 25% of the order value in some jurisdictions. The third is interest income on longer-term financing products (Klarna Financing, Affirm’s longer-duration loans).

The business model is fundamentally a credit model, not a payments model. BNPL providers hold receivables (consumer installments due) financed by debt facilities and capital markets. When interest rates rise sharply — as in 2022–2023 — BNPL providers’ funding costs surge while they often offer 0% financing to consumers. This caused significant losses across the sector and triggered consolidation. The longer-term viability of pure 0% BNPL depends on maintaining low credit losses, which requires disciplined underwriting as the consumer base scales.

What Is the Merchant Case for Offering BNPL?

The merchant case rests on three metrics: conversion rate lift (typically 20–30% improvement at checkout when BNPL is offered), average order value (AOV) increase (commonly 30–50% higher for BNPL transactions versus card), and new customer acquisition (BNPL providers surface merchants in their own apps and marketplaces). For a fashion retailer with a €120 average basket, BNPL might lift AOV to €180 while improving conversion — potentially justifying a 4% fee versus a 1.5% card rate.

However, merchants must also account for return rates (higher on BNPL purchases as consumers buy more impulsively) and chargeback complexity (BNPL disputes require different resolution processes than card chargebacks). For B2B merchants, BNPL-for-business products (Billie, Mondu, Hokodo in Europe) offer net-30/60 payment terms embedded at checkout — a compelling alternative to traditional trade credit management. For full context on how BNPL fits the payment stack, see our gateway and processor guide.

How Is BNPL Regulated in the EU, UK, and Turkey?

In the EU, the revised Consumer Credit Directive (CCD2), which member states must implement by November 2026, extends consumer credit rules to BNPL products: pre-contractual disclosure, affordability assessments, and right of withdrawal apply to interest-free BNPL for the first time. This will require BNPL providers to implement creditworthiness checks across all EU markets.

In the UK, the FCA brought BNPL under its consumer credit regulatory perimeter in 2024, requiring FCA authorization for BNPL providers. In Turkey, the BDDK regulates installment payments on bank cards (taksit) and has historically capped installment periods on certain categories — BNPL as a standalone fintech product operates in a greyer zone under BDDK’s payment service licensing framework.

How Do the Major BNPL Providers Compare?

Klarna is the largest BNPL provider globally by GMV, operating in 45 countries. It offers Pay in 4, Pay in 30 (invoice), and Financing products. Klarna obtained a Swedish banking license in 2017, enabling deposit-taking. Afterpay (owned by Block/Square) dominates in Australia and has strong US presence, operating a pure pay-in-4 model. Affirm focuses on US markets with a spectrum from 0% merchant-subsidized to 36% APR loans, and has deep integrations with Shopify and Amazon. PayPal Pay Later leverages existing merchant relationships — 35M+ merchants already integrate PayPal, reducing BNPL adoption friction to near zero.

In Europe, Scalapay (Italy/Southern Europe) and Riverty (formerly AfterPay by Arvato) compete with Klarna. In Turkey, local banks’ taksit (installment) features on credit cards have historically served the BNPL function — standalone BNPL fintechs are less established. The Digital Payments hub covers related payment innovations in depth.

What Are the BNPL Risks for Consumers and Systemic Finance?

The systemic risk regulators worry about is invisible indebtedness: a consumer using four different BNPL services simultaneously — each with its own app, no bureau reporting — may have €3,000 in BNPL obligations that no lender can see. When income shocks occur (job loss, health crisis), these obligations become unmanageable simultaneously. The UK Money and Pensions Service found that 40% of BNPL users had missed at least one payment.

For corporate finance professionals, the systemic concern is secondary to the operational one: if a key BNPL provider exits a market (as several did during 2022–2023 funding pressure), merchants dependent on BNPL for 20–30% of revenue face an immediate conversion rate hit. Treat BNPL as a supplementary payment method, not a core infrastructure dependency, and maintain card acceptance as the primary rail.

How Does BNPL Affect Merchant Cash Flow and Accounting?

From a merchant accounting perspective, BNPL works like a factoring arrangement: the BNPL provider pays the merchant gross transaction value minus merchant fee immediately (typically within 1–3 business days), and collects installments from the consumer directly. The merchant recognizes revenue at point of sale; the installment collection risk is borne entirely by the BNPL provider. Unlike credit card terminals, there is no consumer credit risk on the merchant’s balance sheet.

The accounting entries are clean: debit Cash (or Accounts Receivable from BNPL provider), credit Revenue, credit Sales Tax Payable. The BNPL merchant fee is recorded as payment processing expense. For companies using accrual accounting, the timing difference between sale recognition and BNPL payout (1–3 days) is typically immaterial. However, for businesses with very high BNPL volume (30%+ of revenue), monitoring BNPL provider settlement reliability — and having contingency payment method coverage — is prudent working capital management.

What Is the Impact of BNPL on Consumer Spending Behavior?

The behavioral economics of BNPL are well-documented and commercially significant. Payment decoupling — separating the pain of payment from the pleasure of purchase — reduces perceived price sensitivity. Consumers tend to focus on the installment amount (€25/month) rather than total cost (€100), making higher-priced items feel affordable. This effect is most pronounced for fashion, electronics, and home goods — categories where BNPL adoption is highest.

Research by the Klarna-affiliated Consumer Payments Research Center and independent studies by the FCA find that BNPL users are disproportionately younger (18–34), urban, and lower-income — demographics with less existing credit product access. For merchants targeting these demographics, BNPL is both a conversion tool and an inclusivity feature. For regulators, the same data raises debt spiral concerns: the customers most susceptible to BNPL impulse purchasing are also those with least financial buffer for missed payments.

How Is BNPL Technology Evolving — From Checkout to Anywhere?

BNPL is evolving beyond the online checkout button. BNPL virtual cards (Klarna Card, Affirm Virtual Card) allow consumers to use BNPL at any retailer — not just those with direct BNPL integrations — by generating a one-time virtual card number charged against the BNPL provider’s account. This dramatically expands the addressable merchant universe without requiring individual merchant integrations.

In-store BNPL (via QR code at POS) is growing in the US, UK, and Australia. Klarna’s in-store QR code allows a customer to split any purchase at a physical checkout. This convergence of online and in-store BNPL creates a unified installment payment method across all channels — potentially the most significant checkout innovation for physical retail since contactless payments. For merchants managing an omnichannel payment stack, ensure your payment provider can report BNPL transactions from both channels in a unified dashboard for accurate payment mix analysis. See the broader payment method context in our Digital Payments hub.

How Does BNPL Affect Merchant Cash Flow and Accounting?

From a merchant accounting perspective, BNPL works like a factoring arrangement: the BNPL provider pays the merchant gross transaction value minus merchant fee immediately (typically within 1–3 business days), and collects installments from the consumer directly. The merchant recognizes revenue at point of sale; the installment collection risk is borne entirely by the BNPL provider. Unlike credit card terminals, there is no consumer credit risk on the merchant’s balance sheet.

The accounting entries are clean: debit Cash (or Accounts Receivable from BNPL provider), credit Revenue, credit Sales Tax Payable. The BNPL merchant fee is recorded as payment processing expense. For companies using accrual accounting, the timing difference between sale recognition and BNPL payout (1–3 days) is typically immaterial. However, for businesses with very high BNPL volume (30%+ of revenue), monitoring BNPL provider settlement reliability — and having contingency payment method coverage — is prudent working capital management.

What Is the Impact of BNPL on Consumer Spending Behavior?

The behavioral economics of BNPL are well-documented and commercially significant. Payment decoupling — separating the pain of payment from the pleasure of purchase — reduces perceived price sensitivity. Consumers tend to focus on the installment amount (€25/month) rather than total cost (€100), making higher-priced items feel affordable. This effect is most pronounced for fashion, electronics, and home goods — categories where BNPL adoption is highest.

Research by the Klarna-affiliated Consumer Payments Research Center and independent studies by the FCA find that BNPL users are disproportionately younger (18–34), urban, and lower-income — demographics with less existing credit product access. For merchants targeting these demographics, BNPL is both a conversion tool and an inclusivity feature. For regulators, the same data raises debt spiral concerns: the customers most susceptible to BNPL impulse purchasing are also those with least financial buffer for missed payments.

How Is BNPL Technology Evolving — From Checkout to Anywhere?

BNPL is evolving beyond the online checkout button. BNPL virtual cards (Klarna Card, Affirm Virtual Card) allow consumers to use BNPL at any retailer — not just those with direct BNPL integrations — by generating a one-time virtual card number charged against the BNPL provider’s account. This dramatically expands the addressable merchant universe without requiring individual merchant integrations.

In-store BNPL (via QR code at POS) is growing in the US, UK, and Australia. Klarna’s in-store QR code allows a customer to split any purchase at a physical checkout. This convergence of online and in-store BNPL creates a unified installment payment method across all channels — potentially the most significant checkout innovation for physical retail since contactless payments. For merchants managing an omnichannel payment stack, ensure your payment provider can report BNPL transactions from both channels in a unified dashboard for accurate payment mix analysis. See the broader payment method context in our Digital Payments hub.

Frequently Asked Questions