Buy Now, Pay Later: Business Model and Market Dynamics

Introduction

Buy now, pay later (BNPL) has evolved from a niche checkout option into a $492.8 billion payment category (2024 volume) that is reshaping how consumers access credit at the point of sale. BNPL allows consumers to split purchases into installments (typically four interest-free payments over six weeks, or longer-term financing for larger purchases) with approval in seconds and minimal credit checks. The model sits at the intersection of payments and consumer credit, creating a new category that competes directly with credit cards for share of consumer spending. For FIG bankers, BNPL generates deal flow through IPOs (Klarna's 2025 listing), M&A (Block's $29 billion acquisition of Afterpay in 2022), ABS issuance (BNPL loan securitization), and strategic advisory (bank-BNPL partnerships, regulatory compliance).

BNPL apps generated $12.5 billion in revenue in 2024 (10.6% YoY growth) across 365 million global users. Global BNPL volume is projected to surpass $560 billion in 2025 (13.7% growth), reaching approximately $912 billion by 2030. The market is consolidating around a small number of scaled players: Klarna (approximately 35% global market share), Affirm, PayPal, Block (Afterpay), and regional leaders.

The Merchant Side

BNPL providers charge merchants a fee of 2-8% per transaction (averaging 4-6%), significantly higher than typical credit card interchange fees (~2%). Merchants accept this higher cost because BNPL demonstrably increases conversion and average order value. Research from the Journal of Financial Economics found that BNPL increases sales by approximately 20%, driven primarily by customers with lower credit access. For merchants, the calculus is straightforward: a 4-6% fee on incremental sales that would not otherwise occur is highly profitable.

The Consumer Side

Consumers benefit from interest-free short-term credit (the standard "pay in 4" model charges no interest if payments are made on time) and instant approval with soft credit checks. BNPL appeals particularly to younger consumers (Gen Z and millennials) who are credit card-averse or credit-thin. Late fees and interest on longer-term BNPL products generate additional revenue but also create regulatory and reputational risk.

The BNPL P&L

The cost side is dominated by credit losses (the largest variable cost), funding costs (BNPL providers must fund the installment loans on their balance sheet or through securitization), and customer acquisition costs. The path to profitability requires sufficient scale to spread fixed costs, disciplined underwriting to control credit losses, and diversified revenue streams beyond merchant discount fees.

Klarna: the global BNPL leader with approximately 35% market share. Klarna generated $2.8 billion in revenue in 2024 (46% YoY growth) and completed the largest IPO of 2025 in September, raising $1.37 billion at a $19.65 billion valuation. Shares surged 30% on the first trading day, opening at $52 versus the $40 IPO price. Ahead of its IPO, Klarna sold $26 billion in BNPL loans to reduce balance sheet risk. Klarna's delinquency rates are relatively low: 0.89% on pay-in-4 loans and 2.23% on longer-term installment products, both below average credit card 30-day delinquency rates.

Affirm: the leading US-focused BNPL provider, generating $2.3 billion in revenue in 2024. Affirm differentiates through its merchant integration model (embedded at checkout for major retailers including Amazon, Shopify merchants, and Walmart) and its Affirm Card (a physical card that allows BNPL functionality at any merchant). Affirm has been more transparent about credit performance than peers, regularly disclosing delinquency and loss data.

PayPal: processed more than $33 billion in global BNPL volume in 2024 (21% YoY growth). PayPal's BNPL offering benefits from its massive existing user base (430+ million active accounts) and checkout presence, allowing it to cross-sell BNPL to existing PayPal users without incremental customer acquisition cost.

Block (Afterpay): Block acquired Afterpay for approximately $29 billion in 2022 (in stock) to integrate BNPL into its Square merchant platform and Cash App consumer ecosystem. The acquisition illustrated the strategic value incumbents place on BNPL distribution.

Pay-in-4 vs. Longer-Term Installments

BNPL encompasses two distinct product types with different economics and risk profiles. Pay-in-4: the consumer splits a purchase into four equal payments over six to eight weeks, with no interest charged and minimal underwriting (soft credit check, no hard inquiry). This is the core BNPL product that drives volume. Credit risk is low because loan durations are short and average ticket sizes are small ($100-300). Merchant fees (4-6%) fund the economics. Longer-term installments: financing for larger purchases ($500-5,000+) with repayment periods of 3-36 months. These products carry interest rates (0-36% APR depending on creditworthiness and merchant subsidy) and require more robust underwriting. Credit risk is higher (Klarna's longer-term delinquency rate of 2.23% versus 0.89% on pay-in-4), but interest income supplements merchant fees. The distinction matters for credit analysis: pay-in-4 portfolios have rapid turnover and low loss severity, while longer-term installment portfolios behave more like traditional consumer lending with meaningful credit cycle exposure.

The product distinction also shapes competitive strategy. Pay-in-4 is increasingly commoditized: every major player (Klarna, Affirm, PayPal, Apple Pay Later, bank-branded BNPL) offers a similar short-term installment product, and the primary differentiator is merchant integration and checkout placement rather than product innovation. Longer-term installments, by contrast, require genuine underwriting capability and credit infrastructure, creating a higher barrier to entry and stronger competitive moats for established providers.

BNPL regulation is also advancing in Europe and the UK. The revised EU Consumer Credit Directive (adopted 2023, member state implementation required by November 2026) brings BNPL under credit regulation for the first time, requiring creditworthiness assessments, standardized disclosures, and right-of-withdrawal protections for all BNPL products across the EU. The UK FCA has been developing its own BNPL regulatory framework since 2021, with draft rules expected to impose affordability checks and advertising standards. For Klarna (headquartered in Stockholm), the simultaneous tightening of US and EU regulation means that the compliance costs of operating a global BNPL platform are rising across all major markets.

The credit risk question will ultimately determine BNPL valuations. If delinquency rates stabilize at current levels (below credit card averages for major providers), the market will reward BNPL companies as high-growth consumer finance platforms. If a recession pushes BNPL losses significantly higher, particularly in longer-term installment products serving near-prime borrowers, the industry could face the same repricing that affected other consumer lending categories during past credit cycles.

BNPL has matured from a disruptive checkout experiment into a mainstream consumer credit product generating nearly $500 billion in annual volume. Klarna's successful IPO, regulatory classification as credit card lending, and the entry of banks and card networks into BNPL all confirm that the category has achieved permanence within consumer finance. The remaining questions are about margin sustainability, regulatory compliance costs, and credit cycle resilience, exactly the analytical questions that FIG professionals are trained to evaluate.