What is buy now, pay later, and what does it really cost?
Splitting a purchase into four payments feels like a payment option, not a loan. It is a loan, and knowing how it is built helps you use it without surprises.
The short answer
Buy now, pay later (BNPL) is a short-term loan offered at checkout. The common US version splits a purchase into four interest-free payments: about a quarter upfront, then three more every two weeks. The merchant pays the lender a fee; you pay nothing extra unless you miss a payment.
Key takeaways
- Pay-in-four BNPL is a no-interest loan repaid in four instalments over about six weeks, usually with 25% due at checkout.
- The lender is mainly paid by the merchant, but missed payments can trigger late fees and automatic card debits.
- US regulators found heavy use: in 2023 six large lenders made 335.8 million BNPL loans worth $45.2 billion.
- Many users juggle several BNPL loans at once, which makes the total owed easy to lose track of.
- Rules differ by country: the UK brought BNPL under FCA regulation in July 2026, while a 2024 US interpretive rule was withdrawn in 2025.
How does buy now, pay later work?
At an online or in-store checkout, a BNPL option lets you take the item now and pay for it in instalments. Behind the button sits a separate lender, not the shop. You agree to a small loan, the lender pays the merchant, and you repay the lender.
The most common US product is called pay-in-four. The U.S. Consumer Financial Protection Bureau (CFPB) describes it as a four-instalment, no-interest loan, typically with a 25% down payment and the remaining three payments due every two weeks, so the loan is repaid in about six weeks1. The CFPB found that the typical purchase financed this way falls between $50 and $1,0001.
Figure · A pay-in-four loan from checkout to last payment
- 01Checkoutpay $50; shop paid in full
- 02Week 2$50 auto-debited
- 03Week 4$50 auto-debited
- 04Week 6final $50; loan closed
Approval is quick. In the CFPB's 2022 study of five large lenders, approval rates rose to 73% in 2021, up from 69% the year before1. Most lenders take the first payment from a debit or credit card and collect the rest automatically from the same card1.
If there is no interest, who pays for it?
The main payer is the merchant. Shops pay the BNPL lender a fee on each sale, much as they pay fees on card payments, and the lender takes on the risk that the shopper does not repay1. Among the lenders the CFPB studied, the average discount rate charged to partner merchants fell from 3.84% in 2019 to 3.08% in 20211.
The second source of income is the borrower, when things go wrong. The CFPB reported that many lenders charged late fees of around $7 per missed payment, on an average loan of about $1351. In its later data, the share of loans that were assessed a late fee was 4.1% in 2023, and 1.83% of loans were charged off as uncollectable3.
Worked example
What one missed payment costs
Take an illustrative $200 purchase split into four $50 payments. If one payment fails and a $7 late fee is added, that fee equals 14% of the missed instalment. The loan stays interest-free, but the fee is steep. Fee amounts and caps vary by lender and by country, so check the terms before you agree.
Pay-in-four BNPL compared with a typical credit card purchase (general features)
| Feature | Pay-in-four BNPL | Credit card |
|---|---|---|
| Interest | None on the standard product | Charged on balances not paid in full |
| Repayment | Fixed: four set payments over about six weeks | Flexible: a minimum payment each month |
| Main cost if you slip | Late fees | Interest plus possible late fees |
| How it is offered | At the merchant's checkout, one purchase at a time | One credit line used anywhere the card is accepted |
How many people use buy now, pay later?
Use has grown fast. The CFPB counted 180 million loans worth more than $24 billion from five lenders in 2021, close to ten times the 2019 level1. By 2023, six lenders in its sample made 335.8 million loans totalling $45.2 billion, and together reported 53.6 million customers who took at least one loan3. Because people can use several lenders, that figure is a sum across firms, not a count of unique people.
Using credit-bureau data, the CFPB found that 21.2% of consumers with a credit record financed at least one purchase with BNPL2. In the UK, the Financial Conduct Authority (FCA) reports that 10.9 million adults, about one in five, used unregulated BNPL at least once in the 12 months to May 20245.
Figure · US BNPL loans made by the lenders the CFPB studied (millions)
What are the risks of buy now, pay later?
The biggest risk is loan stacking: holding several BNPL loans at the same time. The CFPB found that about 63% of borrowers had multiple loans open at once at some point during the year, and 33% borrowed from more than one BNPL lender2. Each loan looks small, but four or five of them can add up to a large share of a monthly budget.
In its 2022 report the CFPB raised three broader concerns: that the product is built to encourage people to buy and borrow more, that lenders are collecting customer data through their own apps, and that borrowers get fewer standard protections than with older credit products, such as consistent cost disclosures and clear dispute rights1. Returns can also be awkward. The lenders it studied told borrowers to contact the merchant first, and they handled payments during a dispute in different ways1.
Risk warning
A small loan is still a loan
Automatic card debits can overdraw your bank account or push a credit card towards its limit if several BNPL payments land in the same week. Only use BNPL for a purchase you could afford to pay for in full today, and keep a list of every instalment you owe.
How is buy now, pay later regulated?
The answer depends on where you live, and it has been changing. In the UK, BNPL agreements that used to fall outside consumer credit rules came under FCA regulation on 15 July 20265. Lenders must now check whether you can afford the repayments before you sign, contact you if you miss a payment, offer support if you struggle, and you can take a complaint to the Financial Ombudsman Service4. If something goes wrong with the purchase, Section 75 of the Consumer Credit Act means you may be able to get a refund from the lender, as with a credit card4.
In the United States, the CFPB issued an interpretive rule in 2024 that treated some BNPL lenders like credit card providers for certain protections, but it withdrew that rule on 12 May 20256. Other federal and state laws can still apply. Our Policy section follows how rules like these change.
BNPL rules in two markets (as of October 2026)
| United Kingdom | United States (federal) | |
|---|---|---|
| Status | Regulated by the FCA since 15 July 2026 | The 2024 BNPL interpretive rule was withdrawn in May 2025 |
| What lenders must do | Check affordability, contact you after a missed payment, offer support | Depends on the lender, the contract and general federal and state law |
| Where complaints go | The lender, then the Financial Ombudsman Service | The lender first, then the relevant regulator |
What mistakes do people make with buy now, pay later?
Common beginner mistakes
Treating it as a payment method, not a loan
Every BNPL plan is a credit agreement with its own lender, terms and fees, separate from the shop.
Losing count of open plans
Several small plans from different apps are easy to forget. Add them up before taking another one.
Linking a card with no headroom
If the card or account linked for autopay is short of funds, you risk a BNPL late fee and a bank fee at the same time.
Assuming a return cancels the loan
Until the merchant confirms the refund to the lender, payments may still be collected. Keep paying or confirm the pause in writing.
Assuming BNPL builds your credit history
In 2022 the CFPB found that most BNPL lenders did not report repayments to the nationwide credit bureaus1, so paying on time may not show up on your credit report. Check each lender's own policy.
Frequently asked questions
Does buy now, pay later charge interest?
The standard pay-in-four product does not charge interest1. Other instalment plans can differ, so read the terms before you accept.
Can I be declined for BNPL?
Yes. Lenders run a quick check at checkout and approve or decline each purchase. In the CFPB's study, about 73% of applications were approved in 20211.
What happens if I miss a BNPL payment?
You may be charged a late fee, and because most lenders collect payments automatically from the linked card, they may keep trying to take the money1. Contact the lender early and ask about hardship options.
Is BNPL safer than a credit card?
Neither is automatically safer. BNPL has fixed, short repayments and no interest on the basic product; a credit card allows flexible repayment but charges interest. The risk depends mostly on how many loans you take on and whether you repay on time.
Why do shops offer BNPL if they have to pay a fee?
Merchants pay the lender a fee on each BNPL sale1, much like card acceptance fees. Whether that pays off depends on how many extra sales the option brings.
The bottom line
Buy now, pay later is a short loan wrapped in a checkout button. The basic pay-in-four plan costs nothing extra if every payment goes through on time, because the merchant pays the lender. The trouble starts when several plans overlap or a payment fails. Treat each plan as debt, keep a running total, and check which country's rules protect you.
Sources
- Buy Now, Pay Later: Market trends and consumer impacts — Consumer Financial Protection Bureau, 2022 Primary source
- CFPB Research Reveals Heavy Buy Now, Pay Later Use Among Borrowers with High Credit Balances and Multiple Pay-in-Four Loans — Consumer Financial Protection Bureau, 2025 Primary source
- The Buy Now, Pay Later Market: Data Spotlight — Consumer Financial Protection Bureau, 2025 Primary source
- Buy Now Pay Later (consumer guide) — Financial Conduct Authority (UK), 2026 Primary source
- Protections to help Buy Now Pay Later borrowers navigate their financial lives — Financial Conduct Authority (UK), 2026 Primary source
- Buy Now, Pay Later (BNPL) products — compliance resources — Consumer Financial Protection Bureau, 2025 Primary source
How we checked this page: every figure above links to the numbered source it came from. Spotted an error? Tell the desk — see our editorial policy.
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