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How BNPL actually works

3 min readReviewed 2026-06-01

Buy Now Pay Later (BNPL) services like Affirm, Klarna, Afterpay, and Apple Pay Later split a purchase into typically four equal payments over six weeks, often with no interest if you pay on time. Longer-term Affirm loans can carry APRs from 0% to 36%. Late fees of $7 to $10 per missed payment are common (Afterpay) and can stack. Most BNPL providers do soft credit pulls and don’t report on-time payments to bureaus, but they increasingly report missed payments, which can ding your FICO score.

A worked example

You buy a $1,200 mattress, a $300 jacket, and $400 of holiday gifts, all on three different BNPL plans, each $200 to $300 every two weeks. Suddenly $1,900 of split payments are due across the next six weeks. Miss the mattress payment, $7 fee plus a credit ding. A CFPB study found BNPL users were more likely to be heavily indebted, with multiple plans active simultaneously. The frictionless checkout hides the math.

The common mistake

Using BNPL for stuff you couldn’t afford to put on a debit card today. BNPL doesn’t make the purchase cheaper; it just hides the affordability question. If you can’t pay cash now, splitting it four ways doesn’t change that.

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