Affirm vs. Klarna vs. Afterpay: Which BNPL Fits Your Store?

On this page 7 sections

1. Affirm vs. Klarna vs. Afterpay at a Glance
2. What Affirm, Klarna and Afterpay Charge Merchants
3. Worked Example: How Many BNPL Sales Must Be New to Break Even
4. Matching a BNPL Provider to Your Store
5. In-Store BNPL: Know Which Path You're Paying For
6. Restricted Categories Rule BNPL Out for Some Stores
7. Payouts, Refunds and Disputes Run Through the Provider

Key takeaways

• The 6% + 30¢ Afterpay fee you see quoted everywhere is Square's published price for Square sellers. It isn't a network rule, and it isn't every merchant's Afterpay rate.
• Affirm and Klarna don't publish U.S. merchant rate cards, and we found no published merchant price for Afterpay's Pay Monthly. Get a written quote for every plan you'd turn on.
• Break-even share of new sales = (BNPL fee − card fee) ÷ (gross margin − card fee). Run every quote through it before you sign.
• When a shopper pays with a BNPL virtual card at your terminal, you pay your normal card rate and card chargeback rules apply. The BNPL fee doesn't.

Affirm vs. Klarna vs. Afterpay mostly comes down to ticket size and which plan you want shoppers to see first. Affirm is built for financing larger purchases over months, with shopper APRs from 0% to 36%. Afterpay is best known for splitting a purchase into four interest-free payments over six weeks, which suits apparel, beauty and other everyday baskets, and it now also offers interest-bearing monthly loans at participating merchants. Klarna covers both ends with a four-payment split and longer financing.

All three cost you more per sale than a card does. The right pick is the provider whose plans your customers will actually use on orders you'd otherwise lose. Comparing prices is the hard part, because only one fee below comes from a published price list, and that list belongs to a processor, not to the BNPL provider. We separate published prices from negotiated ones, then give you a formula to test any quote against your own margins. If you're new to the model, start with our overview of buy now, pay later costs, providers and fit.

Affirm vs. Klarna vs. Afterpay at a Glance

Afterpay's Pay Monthly figures come from its own retailer site. Most of the rest come from consumer-finance reviews (Credible, LendingTree, Ramsey Solutions, Merchant Maverick, Frizzbee) and Stripe's Afterpay guide, not from contracts. Reviewers disagree on Affirm's ceiling: Credible lists $20,000 and LendingTree $30,000. Treat every range as the outer limit. Approval happens shopper by shopper at checkout, and Stripe notes that most Afterpay accounts start with a lower spending limit that grows with on-time payments.

Shopper terms decide who taps each button. Affirm's monthly loans, which carry no late fees, draw planned purchases. Afterpay's Pay in 4 draws baskets a shopper could almost cover today. That makes "Afterpay is only for small baskets" an outdated shorthand. Afterpay describes Pay Monthly as a longer-term product for larger baskets, with terms of three, six, 12 or 24 months, and it names home furnishings, jewelry and travel among the categories where shoppers use it. Whether your shoppers see it depends on whether it's switched on for your store, so ask.

Ownership matters too. Afterpay belongs to Block, the company behind Square, so Square sellers can turn it on inside their existing account. Klarna started in Sweden and operates in many countries, which helps if you ship abroad.

What Affirm, Klarna and Afterpay Charge Merchants

This is the part most comparisons get wrong. The BNPL fee quoted most often online, 6% + 30¢, is Square's published price for Square sellers who offer Afterpay. Square's fee page lists it for online and in-person sales alike. It's one processor's pricing. It isn't a card network rule, and it doesn't set what Afterpay charges a merchant who integrates directly. Stripe's guide puts Afterpay's merchant fees between 3% and 6% per transaction. We found no published merchant price for Pay Monthly, so if you'd offer it, ask Afterpay for that rate in writing.

Klarna doesn't publish a U.S. rate card. Merchant Maverick reports that most U.S. merchants pay 5.99% + $0.30 per transaction, processing included. Use that as a reference point. Klarna doesn't owe you that price.

Affirm doesn't publish a standard merchant rate either, and its pricing depends on the plans you enable. A 0% promotional plan costs you more, because you're covering the interest the shopper doesn't pay. An interest-bearing plan, where the shopper pays the APR, costs you less. Get a written price for every term you plan to offer.

With each quote, ask whether any part of the fee comes back on a refund. Card processing has its own rules here, covered in our guide to whether processing fees come back on a refund. Ask about dispute fees too, including whether you pay them when you win. Then ask about setup charges, monthly minimums and the volume at which the rate becomes negotiable.

You also need your real card cost as a baseline. Divide last month's total processing fees by total card volume to get your effective rate. Our explainer on interchange-plus, flat-rate and tiered pricing shows where those fees sit on your statement.

Worked Example: How Many BNPL Sales Must Be New to Break Even

You pay the BNPL fee on every BNPL order, including orders the shopper would have put on a card anyway. The margin on orders BNPL actually created has to cover that extra fee. That gives a simple test:

Break-even share of new sales = (BNPL fee − card fee) ÷ (gross margin − card fee), all in dollars per order.

Two illustrative scenarios follow. Both use a card cost of 2.9% + $0.30 as a stand-in, so swap in your own effective rate. The apparel case is a Pay in 4 order at Square's published Afterpay price. For furniture, we assume a 7% fee for a 0% promotional plan. That number is hypothetical, picked for the arithmetic, and isn't a quote from Affirm or anyone else.

The apparel shop needs about 7 of every 100 Afterpay orders to be sales it would otherwise have lost. The furniture store, paying for a 0% promotion, needs 11. A bigger ticket doesn't lower the bar when the plan you're subsidizing is expensive.

You can't see "would have lost" directly, so you have to measure it. Tag BNPL orders separately, then compare conversion rate and average order value against the months before launch. Our checkout conversion rate benchmarks help you set that baseline. Our piece on BNPL costs and conversion lift for small businesses goes further into reading the results.

Matching a BNPL Provider to Your Store

Apparel and boutiques. Tickets are modest and returns run high, especially from shoppers who order two sizes and keep one. A short split fits that basket, which is why Afterpay's Pay in 4 and Klarna's Pay in 4 are common here. Refund terms decide your margin. If the fee doesn't come back on returns, every bracketed order costs you a fee on merchandise you get back. Push BNPL messaging before seasonal drops and holiday sales. See how MannyPay works with apparel businesses.

Jewelry and diamonds. Engagement rings and anniversary pieces are planned purchases that peak around the winter holidays and Valentine's Day, so longer financing fits best. An illustrative $6,000 ring sits above the reported $4,000 ceiling for Afterpay's Pay in 4, and above many shoppers' approved amounts on any platform. The plans that can reach that ticket are Affirm's monthly loans, Klarna's financing and Afterpay's Pay Monthly, which goes up to $20,000 depending on the merchant.

Ask each provider which of those it would enable for you. Then ask how custom settings and resizing affect payout timing. Ship online orders with signature confirmation, because that's your strongest dispute evidence. For the card side of large tickets, read jewelry merchant accounts without high holds or see MannyPay's jewelry and diamond merchant services.

Furniture. High tickets meet long lead times and scheduled delivery. Monthly financing of the kind Affirm is known for appeals to a shopper furnishing a whole room, and Afterpay lists home furnishings as a Pay Monthly category, so quote all three. Before signing, ask when payout triggers on a special order that ships in eight weeks, and how the provider handles damaged deliveries and partial cancellations. If you also take deposits, review protecting yourself on custom-order card deposits. MannyPay also serves furniture stores.

Online stores with wide catalogs. If you sell a $40 accessory and a $1,500 bundle, you need short and long plans. Klarna offers both. Afterpay can too where Pay Monthly is available. Confirm the plugin supports your platform version, shows "or 4 payments of" messaging on product pages and syncs refunds back to the provider. BNPL is one more button beside your online payment processing and payment gateway setup. Shopify sellers should check how it fits their Shopify payment integration. Pairing a short-split provider with a long-financing one works, but we'd stop at two buttons.

In-Store BNPL: Know Which Path You're Paying For

A physical store can take BNPL at the counter in three ways:

1. POS integration. BNPL shows up as its own tender type and is priced at the BNPL fee. Square charges the same 6% + 30¢ for in-person Afterpay as it does online.
2. QR code or text link. The shopper applies on their phone, and staff confirm approval before handing over the goods.
3. Virtual card. The shopper's BNPL app issues a one-time card number they tap at your terminal.

The third path changes your cost. A virtual card tap runs through your processor like any card sale. You pay your normal card rate instead of a BNPL merchant fee, and card network chargeback rules govern disputes. For how the card networks price installment sales on their own rails, see our explainer on Visa's new installment interchange rates. Ask each provider which paths it supports in your store. If you're replacing hardware anyway, start with our retail POS buyer's guide for independent stores and MannyPay's POS systems, but confirm the BNPL flow works on the model you choose.

Restricted Categories Rule BNPL Out for Some Stores

Every provider publishes an acceptable use policy, and the lists differ. Common entries include firearms, adult content, cannabis and CBD, tobacco and vape, gambling, crypto, some nutraceuticals, and gift cards or other cash equivalents. Even in allowed categories, custom goods, preorders and items delivered weeks after purchase can come with extra conditions. Our guide to taking preorders without triggering processor holds covers the card-side version of that risk.

If a provider prohibits what you sell, don't relabel products, run sales through another business's account or split orders to get approved. That's transaction laundering. It breaks provider and card network rules and can put your business on the MATCH list, the file card acquirers check before they open accounts.

If BNPL isn't available for your category, you need properly underwritten card acceptance. MannyPay offers high-risk merchant accounts for restricted categories, subject to underwriting.

Payouts, Refunds and Disputes Run Through the Provider

The provider pays you a lump sum minus its fee, on the schedule in your agreement. For online orders, payout is often tied to when you capture or ship. Ask how many business days pass after capture, whether funds arrive daily or in batches, and whether a reserve applies. Refunds go back through the provider, which adjusts the shopper's plan.

Disputes work the same way. A shopper who says an item never arrived files with the provider, and you respond with evidence in its portal: tracking, delivery confirmation, product descriptions and customer messages. That's the same file you'd keep for a card chargeback. The provider takes the loss when a shopper stops paying. It doesn't take the loss when you can't show you delivered what you sold.

Your Monday task is to pull two numbers: average order value and gross margin on your top sellers. Then get written quotes from each provider for every plan you'd enable, including Afterpay's Pay Monthly if your tickets run high. Put each quote through the break-even formula and pilot the provider with the most room to spare. BNPL runs alongside card processing. If your effective card rate looks high once you calculate it, request a free quote and a MannyPay specialist will get back to you within one business day.

Sources

1. Square: Learn About Square Fees
2. Square: Buy Now, Pay Later With Afterpay
3. Afterpay: How Afterpay's Pay Monthly Works
4. Ramsey Solutions: What Is Afterpay?
5. Stripe: Afterpay/Clearpay, An In-Depth Guide
6. Merchant Maverick: Klarna for Businesses Guide
7. Merchant Maverick: What Is Affirm and How Does Buy Now, Pay Later Work?
8. Frizzbee: Klarna Guide, How It Works, Fees and Limits
9. Credible: Affirm Personal Loans Review
10. LendingTree: Affirm Loan Review
11. Ramsey Solutions: Affirm Review

AR

About the author

Adrian Reyes

Adrian Reyes is Senior Payments & Fintech Editor for Beyond the Swipe, covering credit card processing, merchant accounts, payment technology and processing fees.

This article is for general educational purposes and is not legal, tax or financial advice. Card network rules and state laws change; confirm current requirements for your business.