Klarna’s BNPL Dominance Quietly Strains Affirm’s U.S. Checkout Hold

A Checkout War With Unequal Footing

Buy now, pay later was supposed to be Affirm’s home turf. The San Francisco-based fintech built its brand on transparent installment lending, no late fees, and deep integrations with major U.S. retailers including Amazon and Shopify. For a few years, that positioning held. Then Klarna arrived at the American checkout lane with the kind of aggressive consumer marketing and retail breadth that Affirm had never fully anticipated competing against.

Klarna’s U.S. expansion has been methodical and, at times, relentless. The Swedish company entered the American market years ago but accelerated its push through app-first shopping experiences, aggressive merchant sign-on deals, and a consumer-facing brand identity that skews younger and louder than Affirm’s more utilitarian image. While Affirm concentrated on building lender credibility and financial product depth, Klarna was signing up millions of users who didn’t particularly care about the backend mechanics – they just wanted to split a $90 sneaker purchase into four payments and move on.

That difference in consumer psychology may be costing Affirm more than any single lost merchant contract.

Where Affirm’s Checkout Position Is Slipping

Affirm’s integration with Shopify gave it visibility across hundreds of thousands of storefronts, and its Amazon deal cemented a presence at the largest retail destination in the country. But checkout integrations and consumer preference aren’t the same thing. A shopper who opens Klarna’s app, browses merchant offers inside it, and completes a purchase without ever visiting a retailer’s standalone website represents a customer Affirm’s checkout button never had a chance to intercept. Klarna’s app has quietly become a shopping destination in itself, not just a payment option.

That shift matters because it changes where the consumer relationship begins. When Klarna owns the top of the shopping funnel – discovery, deal-browsing, price comparison – the payment method is already decided before the customer reaches any merchant’s checkout page. Affirm’s model depends heavily on being present at the moment of transaction, which puts it downstream of where Klarna is increasingly operating. Affirm has made moves toward a consumer app of its own, but its traction there hasn’t matched Klarna’s installed base or the habitual usage patterns Klarna has cultivated through cashback offers and exclusive deals.

Merchant economics add another layer of pressure. As Klarna scales its U.S. merchant network, it gains negotiating leverage on merchant discount rates – the fees retailers pay to offer BNPL at checkout. A larger user base means more potential conversions for retailers, which justifies Klarna’s seat at the negotiating table. Affirm competes on approval rates and loan quality, which matters to certain retail categories, particularly higher-ticket goods. But for fashion, beauty, and everyday consumer goods – categories where Klarna is dominant – Affirm’s pitch is a harder sell.

Affirm’s Defenses and Their Limits

Affirm hasn’t been passive. Its Adaptive Checkout product, which lets merchants offer multiple payment structures within a single integration, is a genuine differentiator. So is its willingness to underwrite larger loan amounts – sometimes into the thousands of dollars – that Klarna’s short-term split-pay model doesn’t accommodate. Debit+ card, Affirm’s hybrid debit-credit product, is an attempt to own more of the consumer’s daily financial life rather than appearing only at high-consideration purchase moments. These are real strategic bets, not cosmetic adjustments.

The problem is that Affirm’s strengths concentrate in a narrower slice of retail. Home goods, electronics, fitness equipment, healthcare – these are categories where spending is deliberate, ticket prices justify installment lending, and consumers actively want structured repayment terms. In those verticals, Affirm’s credit underwriting and approval rates genuinely compete. Outside them, the value proposition thins quickly. Klarna’s model, by contrast, works almost anywhere a consumer might make a spontaneous or habitual purchase, which describes most of retail by volume.

Affirm’s partnership with Apple Pay has been cited as a significant distribution advantage, and it is – in theory. Apple’s ecosystem reach is enormous. But the terms of how BNPL options surface within Apple Pay, and how often consumers actively select Affirm over other options, aren’t numbers Affirm publishes with granularity. The distribution channel is real; the conversion benefit is harder to verify from the outside.

What Klarna’s IPO Push Means for the Competition

Klarna’s anticipated U.S. IPO filing adds a new dimension to this competitive dynamic. Going public in America isn’t just a capital event – it’s a branding exercise, a recruiting signal, and a way to entrench U.S. market credibility at a moment when Klarna wants to be seen as a domestic player rather than a European import. The IPO process will require Klarna to disclose U.S. user metrics, merchant counts, and transaction volumes with more precision than it currently shares publicly. Those disclosures, when they arrive, will offer the clearest picture yet of exactly how much ground Affirm is defending – and how much it may have already ceded.

Affirm’s stock has traded with volatility tied directly to investor confidence in its ability to hold market share as Klarna’s domestic profile grows. Both companies are profitable only intermittently, and both are burning through merchant acquisition costs in pursuit of scale. But Klarna enters its public chapter with a consumer brand that requires less explanation to a general audience – and in retail payments, brand recognition at the point of sale is not a soft advantage.