#1112 2005 · Klarna · Financial technology / e-commerce
Klarna made installments interest-free for shoppers and billed merchants for the risk
the problem
Online shoppers distrusted paying upfront for unseen goods, suppressing conversion for merchants selling on invoice
background
Early e-commerce forced a stark choice on merchants: demand payment upfront and lose customers wary of paying for goods sight unseen over the internet, or ship on invoice and absorb the risk of nonpayment themselves. Three Stockholm School of Economics students — Sebastian Siemiatkowski, Niklas Adalberth, and Victor Jacobsson — pitched a financing solution to Swedish investors and finished last in a televised competition, with one judge dismissing it outright: the banks would never do it.
Asking shoppers to pay interest for the privilege of splitting a purchase into installments would have reproduced the same trust barrier the whole idea was meant to solve — a fee at checkout is exactly the friction that makes buyers abandon a cart. The founders needed the installment credit to feel free to the shopper while someone else absorbed both the risk and the cost of offering it.
what everyone would do
Charge shoppers modest interest for the convenience of installment payments the way traditional consumer credit always had, or leave the pay-upfront-or-invoice choice as it was and accept the conversion Klarna's founders were trying to unlock would stay lost.
what they saw
The party who wanted the sale badly enough to pay for smoother checkout wasn't the shopper — it was the merchant losing sales to hesitation, for whom a fee beat losing the cart.
the move
Klarna pays merchants the full sale amount upfront, immediately assuming the risk that the customer won't pay, and lets shoppers split the purchase into interest-free installments. In exchange, merchants pay Klarna a transaction fee — commonly in the 3-6% range — betting that removing payment friction raises conversion and average order value enough to cover it.
why it works
The mechanism works because merchants have a far larger financial stake in a single completed transaction than Klarna's fee costs, while shoppers are exquisitely sensitive to any visible fee at checkout, so shifting the charge from buyer to seller removes friction precisely where it's most costly and adds cost precisely where it's most tolerable. Klarna's own credit-risk assessment before advancing funds to the merchant is what makes the underlying economics work — it only profits if its default-rate models are more accurate than the higher conversion the interest-free experience generates.
the payoff
Klarna now processes 3.4 million transactions a day across 26 countries and over one million merchants.
where it breaks
It requires products with margins wide enough to absorb a multi-percent transaction fee, which works for retail goods but breaks down for already thin-margin categories. It also depends on Klarna underwriting credit risk accurately enough that defaults stay below what the merchant fees can cover — a systemic rise in defaults, as seen across the BNPL industry during economic downturns, erodes the model from the funding side rather than the demand side.
what came after
Klarna's model became the template for the entire buy-now-pay-later industry — Affirm, Afterpay, and PayPal's own BNPL products all fund interest-free installments the same way, by charging the merchant instead of the shopper.
references
- [1]How Klarna CEO Sebastian Siemiatkowski Went From Flipping Burgers To Building A $2.5 Billion BusinessForbes, 2018forbes.com
- [2]What Klarna is and how the buy now, pay later firm worksQuartz, 2024qz.com