An old idea with a new button
Paying over time is older than any app. Layaway, store credit and installment plans let shoppers take home a sofa or a TV and pay for it in pieces long before the internet. Today's buy-now-pay-later services put the same idea behind a checkout button, with quick approvals and payments that come out automatically.
The two main kinds of plan
Pay in 4. The purchase is split into four payments, usually one at checkout and three more every two weeks. When you pay on time there's normally no interest. This is what most people mean by buy now, pay later.
Monthly plans. Bigger purchases can be spread over months, often 3 to 24 or more. These work like a loan: they usually carry interest (an APR), though stores sometimes offer 0% promotions.
Where the costs hide
- Late fees. Some services charge them (Klarna and Afterpay cap theirs at 25% of the order); Affirm and PayPal Pay in 4 say they don't charge any.
- Per-order fees. A few services, such as Zip, add a small fee to many orders.
- Subscriptions. Some apps sell paid tiers that unlock more stores.
- Interest on longer plans. APRs can run into the 30s on monthly plans.
Pay-later and your credit
Most services approve Pay in 4 with a soft credit check, which doesn't affect your score. Reporting is changing: Affirm now reports its pay-over-time loans to Experian, and Sezzle offers opt-in reporting that can help build credit. Longer monthly plans can involve a hard check. Missed payments can end up on your credit file and usually block new purchases until you catch up.
Habits that keep it painless
- Keep one or two plans at a time, so the payments stay easy to track.
- Make sure automatic payments come from an account that will have the money on each due date.
- Put the due dates on your calendar; most plans pay every two weeks.
- For returns, the refund goes back to the plan, so keep paying until it's processed.
- Compare the total cost of a monthly plan with what you'd pay on a card or by saving up.
This guide is general information, not financial advice. Facts checked October 2026.