Buy Now Pay Later: What It Is, How It Works, and Best Apps

Buy Now Pay Later (BNPL) lets you split a purchase into smaller, interest-free installments instead of paying everything upfront. Over 90 million Americans now use BNPL services, and the market hit roughly $70 billion in transaction volume during 2025.

BNPL is offered at checkout by thousands of online and in-store retailers. The most popular providers in the US include Klarna, Affirm, Afterpay (now part of Cash App), Sezzle, Zip, and PayPal Pay in 4.

This guide covers how BNPL works, what it costs, how it affects your credit score, and which apps offer the best terms.

Buy Now Pay Later is a type of short-term financing that splits your purchase into equal installments. You pay the first portion at checkout, and the remaining payments are automatically charged every two weeks until the balance is paid off.

The standard BNPL plan is "Pay in 4": four equal payments spread over six weeks. Some providers also offer longer-term monthly plans for bigger purchases.

If you stick to the payment schedule, most BNPL plans charge zero interest and zero fees. That makes BNPL cheaper than credit cards for short-term purchases, and it is one of the main reasons the payment method has become so popular.

But if you miss a payment, you can face late fees and, in some cases, interest charges. Roughly 41% of BNPL users reported paying late at least once in the past year, so it is important to only commit to payments you can actually afford.

The process is straightforward. When you check out at a retailer that accepts BNPL, you select the BNPL option and choose your provider. The provider runs a quick soft credit check (often described as buy now pay later no credit check, since it does not appear on your credit report) (which does not affect your credit score), approves you in seconds, and pays the retailer in full on your behalf.

You then repay the provider according to your payment plan. Most BNPL services offer one or more of these payment structures:

BNPL has clear advantages over credit cards and personal loans for certain types of purchases. But it also has real downsides you should understand before signing up.

Each BNPL app has different terms, fee structures, and merchant networks. Here is how the top providers compare.

Klarna is best for shoppers who want flexible payment options. You can split purchases into four interest-free payments over six weeks, pay the full amount within 30 days, or choose monthly financing for up to 36 months.

Monthly financing plans carry interest rates from 0% to 24.99% APR, depending on your credit and the merchant. If you miss a payment, Klarna charges a late fee of up to $7 per installment.

Klarna also offers a virtual card you can add to Apple Pay or Google Pay for in-store purchases at any retailer.

Affirm stands out because it charges no late fees, which is unique among major BNPL providers. You can split purchases into four interest-free payments over six weeks, or choose monthly financing for up to 60 months.

Monthly payment plans may carry interest from 0% to 36% APR, depending on the merchant and your credit. Many retailers offer special 0% APR promotions through Affirm for larger purchases.

Affirm also reports payments to Experian, so on-time payments on monthly plans can help build your credit history.

Afterpay, now integrated into Cash App, uses a simple Pay in 4 model. Your purchase is split into four equal payments due every two weeks, with no interest charged.

If you miss a payment, Afterpay charges a late fee of up to $8, capped at 25% of the order value. Afterpay needs to approve each individual purchase, so spending limits depend on your payment history with the platform.

Afterpay is available at over 100,000 retailers in the US and can also be used in-store through the Cash App.

Sezzle offers Pay in 2, Pay in 4, and monthly financing options. Standard short-term plans are interest-free, while longer-term financing (up to $15,000) carries rates from 5.99% to 34.99% APR.

One feature that sets Sezzle apart is Sezzle Up, which lets you opt into credit reporting with Experian, Equifax, and TransUnion. Making on-time payments through Sezzle Up can help you build your credit score, which most other BNPL apps do not offer.

Sezzle also lets you reschedule payments if you need extra time, and offers a virtual card for in-store shopping anywhere Visa is accepted.

PayPal Pay in 4 lets you split purchases between $30 and $1,500 into four interest-free payments over six weeks. There are no late fees and no interest.

The biggest advantage is PayPal's massive merchant network. If a retailer accepts PayPal, you can use Pay in 4. Payments do not affect your credit score.

PayPal Pay in 4 is available in most US states, though some states have restrictions.

Zip (formerly Quadpay) lets you split purchases into four interest-free payments over six weeks. Late fees are up to $7 per missed payment.

Zip works at millions of stores online and in-store through its app and virtual card. You can shop at any retailer, not just Zip partners, by using the Zip app to generate a virtual card at checkout.

Picking the right BNPL app depends on what you are buying, how long you need to pay, and what matters most to you. Here is what to compare:

Applying for BNPL does not hurt your credit score. All major providers use a soft credit check during the approval process, which is invisible to other lenders and has no impact on your score.

However, the relationship between BNPL and your credit gets more complicated after that.

On-time payments are generally not reported to credit bureaus by most BNPL providers. This means paying on time will not help build your credit. Exceptions include Sezzle (through Sezzle Up) and Affirm (on monthly financing plans), which offer opt-in reporting to Experian, Equifax, and TransUnion.

Late or missed payments can hurt your credit. Some BNPL providers report missed payments to credit bureaus, and if your account goes to collections, it will show up on your credit report. Klarna, for example, may report overdue accounts to credit agencies after repeated missed payments.

So is buy now pay later bad for credit? Not if you pay on time. The approval process uses a soft check, so getting approved will not lower your score. The risk comes only from missed payments.

The regulatory landscape for buy now pay later is shifting. In 2024, the Consumer Financial Protection Bureau (CFPB) issued an interpretive rule that would have regulated BNPL products like credit cards under the Truth in Lending Act. That rule was withdrawn in 2025, and the CFPB has indicated it does not plan to reissue it.

With federal oversight pulled back, states are stepping in. New York passed legislation requiring BNPL providers to obtain licenses and follow specific disclosure rules. Other states are considering similar measures.

For consumers, this means protections vary depending on where you live. Before using BNPL, check whether the provider clearly discloses all fees, interest rates, and what happens if you miss a payment. The CFPB's December 2025 market report found that late fees have declined and charge-off rates dropped even as the number of BNPL loans increased, which suggests the industry is maturing.

BNPL can be a smart way to manage cash flow on purchases you have already budgeted for. If you know you can make all four payments on time, you are effectively getting a six-week, interest-free loan. That is a better deal than putting the same purchase on a credit card and carrying a balance.

But BNPL is not free money. Nearly 60% of BNPL users admit they have used it to buy something they could not otherwise afford. When you stack multiple BNPL commitments on top of each other, the biweekly payments can add up fast.

Before using BNPL, consider these questions:

BNPL usage is highest among younger consumers. About 48% of Millennials have used BNPL at least once, compared to 40% of Gen Z, 28% of Gen X, and 13% of Baby Boomers.

Women use BNPL more frequently than men, and the service is increasingly being used for everyday purchases. About 25% of BNPL users have used it to buy groceries, up from 14% the year before. Electronics (44%) and clothing (39%) remain the most popular categories.

BNPL is not the only way to spread out payments. Here are some alternatives worth considering:

Credit cards with 0% intro APR: Many cards offer 0% APR for 12 to 21 months on new purchases. This gives you much longer to pay off your balance interest-free, and you earn rewards on every purchase. The catch is that you need decent credit to qualify.

Personal loans: For larger purchases, a personal loan gives you a fixed rate and predictable monthly payments over one to seven years. Rates for borrowers with good credit typically start around 6-8% APR.

Store financing: Many retailers offer their own financing with 0% interest for a set period. Just watch out for deferred interest traps, where you owe all the accrued interest if you do not pay off the balance before the promotional period ends.

Saving up: The simplest alternative. If you can wait, setting aside money each paycheck avoids all fees, interest, and the risk of overextending yourself.