The little "4 interest-free payments" button is now sitting next to the checkout button at nearly every major retailer, and a growing number of Americans are clicking it.
Buy now, pay later services like Klarna, Afterpay, Affirm, and PayPal have turned splitting a purchase into four installments into an everyday habit rather than an occasional treat.
The pitch is simple: get the thing now, pay over six weeks, no interest.
But consumer advocates say the fine print is where things get expensive.
Unlike credit cards, most BNPL loans don't report to the big three credit bureaus.
On-time payments often won't build your credit history, but missed payments can still land you in collections or get reported by newer bureaus that track these loans.
The result is a payment method that feels invisible until it suddenly isn't, and many shoppers have no idea how many active plans they're juggling at once.
Four of them running at the same time can quietly eat hundreds of dollars a month from a checking account, and each one hits on a different date.
A 2023 report from the Consumer Financial Protection Bureau found that borrowers who used BNPL were more likely to also carry credit card balances, take out payday loans, and overdraft their accounts.
The service didn't create the debt problem, but it made spending feel painless right up until the withdrawals started bouncing.
Most providers charge around $7 to $10 per missed installment, and some cap total fees per order while others don't.
Autopay failures trigger them even when you didn't mean to skip.
If you return an item but the installment plan keeps running, you can end up paying for something you no longer own while waiting weeks for a refund to untangle.
There's also a newer twist: BNPL is spreading to groceries, gas, and even rent in some markets.
When installment payments move from sneakers into essentials, that's a signal households are stretching to cover basics, not just splurging.
The CFPB has pushed for treating these products more like credit cards, with clearer disclosures and dispute rights, but rules are still catching up.
If you use these services, a few habits help.
Track every active plan in one place, calendar the due dates, and never let a BNPL payment compete with rent, utilities, or a credit card minimum.
Turn off autopay only if you're certain you'll pay manually on time, since missed autopay is the most common fee trigger.
The bottom line: these apps are designed to make you spend more by making each purchase feel smaller than it is.
Used deliberately for a planned expense, they can genuinely be free money.
Final Thoughts
Used as a reflex at checkout, they're a layaway plan with a friendlier face, and the bill always arrives.