Quick answer: Klarna makes most of its money the way you’d probably guess least not from you. Roughly 57% of its revenue comes from fees it charges retailers for every sale it processes, another chunk comes from interest on its longer installment plans, a smaller slice comes from late fees when shoppers miss a payment, and a newer piece comes from advertising inside its app. In 2024, that mix added up to $2.81 billion in revenue on $105 billion worth of purchases run through the platform.
Here’s the part that trips people up: Klarna built its entire reputation on “pay in 4, no interest, no fees.” So how does a company that keeps telling you it won’t charge you anything actually turn a profit? The honest answer is that it barely did, for years. Klarna lost money on purpose for most of its life, betting that growth would eventually outrun the cost of it. That bet only recently started to pay off, and the way it did says a lot about who’s really footing the bill every time you check out with Klarna at 2 a.m.
The short version: four revenue streams, one dominant
Strip away the fintech jargon and Klarna’s income falls into four buckets. Based on its 2024 full-year numbers, this is roughly how the pie splits:
- Merchant fees about 57% of revenue. The cut Klarna takes from stores every time you buy something through it.
- Interest income about 24% of revenue. Charged on longer financing plans, plus interest Klarna earns on the cash sitting in its own accounts.
- Consumer fees about 12% of revenue. Mostly late fees, charged when a “Pay in 4” installment is missed.
- Advertising and other about 6% of revenue. A newer line item from brand placements and sponsored listings inside the Klarna app.
None of that comes as a surprise to anyone who’s worked in retail. What’s less obvious is why a store would agree to hand over a slice of every sale just so a customer can split the bill into four payments. That question is really the whole story.
Merchant fees: the part of the business that actually pays the bills
When you use Klarna at checkout, the retailer doesn’t wait 30, 60, or 90 days to get paid the way they might with a layaway plan or a store credit account. Klarna pays the merchant almost immediately usually within a day or two and then takes on the job (and the risk) of collecting from you over time.
For taking on that risk and speeding up cash flow, Klarna charges the merchant a fee. Depending on the market, the payment method, and how the deal is negotiated, that typically lands somewhere between 2% and 6% of the transaction, plus a small fixed fee per order. Compare that to the roughly 1.5% to 3% merchants usually pay on a standard credit card swipe, and it’s clear Klarna isn’t cheap for retailers to work with.
So why do stores keep signing up? Because the fee isn’t really a payment-processing cost in their eyes it’s a marketing cost. Klarna has published data showing merchants who add it as a checkout option tend to see bigger average order values and fewer abandoned carts, because splitting a $200 purchase into four $50 payments makes it feel a lot more affordable in the moment. Retailers are, in effect, paying Klarna to make their prices feel smaller. Whether that math works out for every merchant is a separate question, but enough of them believe it does that Klarna now has agreements with more than half a million stores worldwide, from H&M and Sephora to Nike and IKEA.
Interest income: where the “no interest” promise quietly ends
Klarna’s short-term “Pay in 4” product genuinely doesn’t charge interest that part of the pitch is true. But it’s not Klarna’s only product, and it’s not where the bigger purchases go.
For larger-ticket items, Klarna offers longer financing plans stretching anywhere from 6 to 36 months, and those do carry interest, with annual percentage rates that can run close to 30% depending on the customer’s credit profile and the country. That’s a meaningfully different product from the interest-free installment plan Klarna is famous for, and it’s easy to see how someone could sign up expecting one and end up in the other.
On top of consumer financing, Klarna also earns interest the boring, old-fashioned way: by holding customer deposits and float in interest-bearing accounts. It’s a small piece of the pie individually, but combined with longer-term financing, interest income made up close to a quarter of total revenue in 2024 a bigger share than most people assume for a company that markets itself as interest-free.
Consumer fees: the late-fee reversal
For years, one of the things that set Klarna apart from competitors was that it didn’t charge late fees at all. That changed in March 2023, when Klarna started charging customers who missed payments on “Pay in 4” plans. The company’s own reasoning was that a small penalty actually improved on-time payment rates, which in turn reduced the losses it was absorbing from unpaid balances. Cynical or not, it worked well enough financially that consumer fees now account for roughly 12% of total revenue not the biggest line item, but not nothing either, especially since it’s close to pure margin once the collections infrastructure is already built.
Advertising: the newest, smallest, and most telling revenue stream
The most recent addition to Klarna’s business is advertising brands paying to be featured inside the Klarna shopping app, alongside a rewards program and a browser extension that nudges users toward Klarna-affiliated retailers while they browse. It’s still a small slice of revenue, around 6%, but it’s the one that says the most about where Klarna sees its future. Increasingly, Klarna doesn’t just want to be the “pay later” button at checkout. It wants to be the place shoppers start looking before they’ve even picked a store, which turns Klarna into something closer to a shopping search engine with a lending arm attached and shopping search engines make their real money on ads, not transaction fees.
Is Klarna actually profitable?
This is where the honest answer gets a little uncomfortable for a company its size. Klarna posted a net loss of $244 million in 2023. In 2024, it turned that around to a net income of $21 million — its first annual profit since 2019. Revenue grew 24% year over year to that $2.81 billion figure, and gross merchandise volume crossed $105 billion. Momentum carried into 2025, with revenue for the first half of the year reaching $1.52 billion, up 21% from the same period a year earlier. Those are real, positive numbers, and the turnaround is genuine. But it’s worth sitting with how thin that 2024 profit margin actually was relative to the scale of the business: $21 million in net income on $2.81 billion in revenue works out to less than 1%. Klarna isn’t burning cash the way it once was, but it hasn’t exactly become a cash machine either — at least not yet.
The IPO changed the conversation, not the business
Klarna went public on the New York Stock Exchange in September 2025, raising roughly $1.37 billion and trading under the ticker KLAR. For a company that had been rumored to be heading toward an IPO for years, it was a genuine milestone and it also meant Klarna’s finances stopped being something outsiders had to piece together from leaked reports and became something anyone can pull up on a brokerage app. That transparency hasn’t necessarily been kind to the stock. Shares have traded in a wide band since listing, and the swings say more about how Wall Street feels about buy-now-pay-later as a category than about any single quarter of Klarna’s results. It’s also a reminder of something worth keeping in mind whenever a founder’s paper fortune is tied to a freshly listed stock: a public listing doesn’t change how a company earns a dollar, it just puts a very public price tag on whether investors believe that dollar is worth chasing.
How Klarna’s money-making compares to Affirm and Afterpay
It’s tempting to lump every “buy now, pay later” app into one basket, but the revenue mix actually varies quite a bit between them. Affirm, for instance, historically leans harder into interest income from consumer loans than Klarna does, alongside its own merchant fees and card-related revenue. Afterpay, now owned by Block, built its early model almost entirely around merchant commissions in the 4-6% range with essentially no interest charged to consumers at all, closer to Klarna’s original “Pay in 4” pitch before Klarna layered longer financing on top. The short version: Klarna sits somewhere in the middle of the pack, more diversified than Afterpay’s original model, less interest-dependent than Affirm, and increasingly betting on advertising and shopping features to be the thing that differentiates it going forward.
Frequently asked questions
Not directly, in most cases. If you use “Pay in 4” and never miss a payment, Klarna typically earns nothing from you the merchant’s fee covers it. You become a cost to Klarna only if you use a longer, interest-bearing plan or miss a due date.
Because the data they see suggests it drives bigger baskets and fewer abandoned carts, which retailers treat as a marketing expense rather than a pure payment-processing cost.
In parts of Europe, yes Klarna holds a banking license and offers deposit accounts, which is part of how it also earns interest income on customer funds. In the U.S., its footprint is closer to a payments and lending company rather than a full retail bank.
Yes, briefly. Klarna was profitable prior to 2019, then leaned into aggressive, loss-funded growth for several years before returning to profitability in 2024.
What’s clear once you actually trace where the money comes from is that Klarna’s “free” promise was never really free it was just aimed at a different payer. Merchants underwrite the convenience, longer financing plans quietly bring interest back into the picture, and a small percentage of shoppers who miss a due date end up funding a meaningful slice of the business too. It’s a workable model, and 2024’s numbers suggest it’s finally tipping toward sustainable. Whether it stays that way probably depends less on how many people download the app and more on how many of them actually pay on time.