How to stop impulse buying

Buy Now, Pay Later (Klarna, Afterpay): Why It Makes You Spend More

3 min read

Buy now, pay later — Klarna, Afterpay, Affirm, and the "pay in four" buttons at checkout — is popular for a simple reason: it makes buying feel almost free. That's also exactly why it can lead you to spend more than you meant to. This isn't a scare piece about debt villains. It's an honest look at the mechanism, so you can use these tools with your eyes open, or decide to add back the friction they're designed to remove.

How BNPL quietly turns off the brakes

Every purchase has a small built-in brake: the mild discomfort of parting with money. Researchers call it the "pain of paying," and it's part of what stops us buying everything we're briefly tempted by. Brain-imaging work has linked seeing an off-putting price to activity in a region associated with discomfort, and the balance between that price-pain signal and the reward of wanting the item actually predicted whether people bought (Knutson et al., 2007). Anything that mutes the pain lets more purchases through.

BNPL is very good at muting it. Instead of one price that stings, you see four small payments spread into a comfortable-feeling future — and the sting is exactly what would have slowed you down. We already know the direction this pushes: when a payment method makes spending feel less real, willingness to pay goes up. In controlled studies, people were willing to pay substantially more with a card than with cash — in one auction, roughly twice as much (Prelec & Simester, 2001). BNPL takes that same effect further, splitting and delaying the cost until the purchase barely feels like spending at all.

What the regulators actually found

It's worth grounding this in real data rather than alarm. The Consumer Financial Protection Bureau studied how people actually use these products, and the CFPB's 2023 report Consumer Use of Buy Now, Pay Later found that most BNPL borrowers held multiple simultaneous loans, and that the products were used more heavily by borrowers who also carried high credit-card balances (CFPB, 2023). In plain terms: BNPL tends to stack. Because each individual purchase feels small and painless, it's easy to end up juggling several at once — which is precisely the pattern you'd expect from a tool that removes the friction that normally makes you pause.

How to put the friction back

If BNPL works by removing the pause and muting the pain, the defense is to restore both.

Pay in a way you can feel. For the categories where BNPL tempts you most, switch to paying the full price up front — ideally in a form where the cost registers. If a purchase only feels affordable when it's split into four, that's useful information, not a reason to split it. See paying with cash to spend less and cash vs. card.

Add a deliberate wait. BNPL is often an impulse-buy accelerant precisely because it's frictionless at the moment of temptation. A buying urge spikes and then fades, and rarely survives a short delay (Hoch & Loewenstein, 1991). So before you tap "pay in four," apply the 24-hour rule. If you still want it tomorrow at the full price, it's a real choice, not a frictionless one.

Remove the one-tap versions. The most dangerous BNPL is the kind saved into a checkout so it takes a single tap. Strip out stored BNPL and one-click options for the stores where you overspend. See removing shopping triggers.

Why a pause is the natural counter

Because BNPL's whole effect comes from removing the friction and the pause that would normally slow a purchase down, the thing that helps is deliberately putting the pause back. ImpulseShield holds a short, private pause between the urge and the checkout, on your device — the exact friction these "pay in four" buttons are built to erase.

For the deeper reason frictionless payment works on all of us, see why do I impulse buy; for the full toolkit, how to stop impulse buying.

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