The BNPL Buy Button
Picks Your Payment Dates.

During the 2025 holiday season, shoppers used buy now, pay later plans to finance a record $20 billion in online purchases, up nearly 10% from 2024. In an Experian survey taken in October 2025, 43% of consumers said they had used or planned to use one for holiday shopping, more than double the 20% who said so the last time Experian asked, in 2023. The option now sits right next to the card form at checkout on most major retail sites.

That growth has a cost the checkout page doesn't show. In the Federal Reserve's 2025 survey of household finances, 11% of buy now, pay later users, about one in nine, said a payment had triggered an overdraft or insufficient-funds fee from their bank over the prior 12 months.

That is surprising, because the loan itself is usually free. A pay-in-four plan paid on time costs no interest, which beats carrying the same balance on a credit card at 22%. So the fees aren't coming from the price. They're coming from the calendar.

The Buy Button Sets Your Schedule

A pay-in-four plan splits a purchase into four equal payments. The first is charged at checkout, and the other three come out of your debit card or bank account every two weeks after that. So the day you buy sets every payment date that follows, and none of those dates are chosen around your payday.

Changing them later is hard. One of the largest providers says plainly on its help page that payment due dates cannot be changed; you can pay early, or ask for a hardship deferral that is not guaranteed. Another lets you push a single payment back by 14 days, once per order, and the rest of the schedule moves with it. Compare that with a credit card, where most issuers will let you choose your due date. With these plans, the lender picks the date, and it picks it the moment you click "buy."

Six Weeks, Not Six Months

The plan also moves much faster than a card. On a credit card, a $400 purchase becomes one line on a monthly bill with a small minimum payment. On a pay-in-four plan, it is $100 every two weeks until it is gone, so a single month can carry $200 or even $300 of it. Paying a purchase off in six weeks is a good habit, but it means your checking account has to be ready for it on four specific days.

Same Purchase, Two Different Days

Consider a household paid every other Friday. Like many households, its checking balance runs lowest in the two days before payday, when it is usually down to about $60. In late November 2026 it buys a $400 gift with a pay-in-four plan. Here is the same purchase made on two different days.

It is the same store, the same price and the same zero interest, with the purchases made two days apart. Bought on payday, every payment comes out the same day a paycheck arrives, and the household barely notices. Bought on the Wednesday, every payment lands on the household's thinnest day and pulls the account $40 below zero, four times in a row. At $10 to $35 per overdraft fee, that is up to $140 on an interest-free $400 purchase, or 35% of the price. Some banks forgive a shortfall that is fixed by the end of the next business day, but with payday still two days away, that window closes first.

If you are paid twice a month, on the 1st and the 15th for example, the picture is messier still. Payments every two weeks drift against paydays that fall on fixed dates, so some payments land just after payday and others just before it. There is no single safe day to buy, which is exactly why a calendar beats a rule of thumb.

What Else Is Due That Day

The overdraft fee is often the smaller problem. A payment that empties the account leaves nothing for the bills that cannot slip, and each of them has its own consequences:

• Rent or mortgage. A late or returned payment brings late fees set by your lease, your loan or state law. In New York, a landlord can charge the lesser of $50 or 5% once rent is five days late; on an FHA mortgage, the late charge can be 4% after 15 days.
• Other credit cards. A bounced autopay brings a penalty fee, and a payment that reaches 30 days late can be reported to the credit bureaus.
• Utilities. A returned payment can bring its own fee plus late charges, 1.5% a month in Pennsylvania, for example.
• The plan itself. If the installment fails, some providers charge a late fee of up to $7, and some report missed payments to the credit bureaus.
• Groceries. Nothing bounces and no fee arrives. The week's food money is simply gone, so the groceries go on a credit card at 22%, or the family goes without until Friday.

This is how one in nine users end up paying their bank for an interest-free loan. For the full picture of how banks and billers handle a short balance, see Overdraft vs. NSF: Your Bank Picks Your Fee.

And holiday shoppers rarely stop at one plan. Each one lives in its own app with its own schedule. Three purchases made on three different days can mean twelve payments on twelve different dates, running into February, through the same weeks the December credit card bill comes due. Nothing adds them up for you.

A Budget Can't See This

A monthly budget will tell you that $100 every two weeks fits within your month. It cannot tell you whether $100 fits on December 23. Answering that takes a calendar: your paydays, your bills, and your balance day by day, with the new payments placed where they will actually land.

So before you click "buy," ask yourself: can you see where those four payments will fall against your rent, your card payments, your utilities and your grocery money? Most people can't. Their bank shows what already happened, their budget shows the month as a single number, and the payment schedule shows up only after the purchase is made.

See the Payments Before You Buy

That is the gap aiSmartBudget was built to fill. Add the plan as a scenario in your Register: the payment amount, every two weeks, starting on the day you plan to buy and ending after the fourth payment. The Register then shows each payment next to your real paydays and bills, with your balance day by day. If one of them lands on a day that dips below zero, try a different purchase day and compare, or plan to pay that installment early from the paycheck before it. When you do buy, turn the scenario into a real bill so it stays on your calendar until the last payment clears.

Buy now, pay later can be a better deal than a credit card. It just comes with a worse calendar, and the calendar is the part you can check before you click "buy."

Sources: Adobe Analytics, 2025 holiday season; Experian holiday survey of 1,002 U.S. consumers, October 2025; Federal Reserve Board, Economic Well-Being of U.S. Households in 2025 (May 2026); provider help pages, October 2026. Fees and policies vary by provider, bank and state.