Klarna for Business UK: BNPL Fees and Integration Explained

Klarna is a Swedish-founded buy now, pay later (BNPL) provider that lets UK shoppers spread the cost of purchases across interest-free instalments, whilst paying the merchant in full upfront. Founded in 2005 and operating in the UK since 2014, Klarna is regulated by the Swedish Financial Supervisory Authority (Finansinspektionen) and works with over 20,000 UK retailers. Transaction fees for UK merchants start at approximately 0.99% plus 35p per transaction for Pay in 3 and Pay in 30, though actual rates are negotiated individually based on volume and sector. Klarna is best suited to online retailers with an average order value above £50 and monthly card volume above £10,000.

Key Facts: Klarna UK

Updated August 2026

Who Is This Page For?

This page is for UK online retailers and ecommerce business owners who want to understand Klarna's merchant fees, how it compares to Clearpay and PayPal Pay in 3, and whether adding BNPL at checkout makes commercial sense for their volume and sector. It is also relevant to merchants who are considering switching BNPL providers or adding buy now, pay later alongside their existing card processor.

Who Is Klarna For?

Klarna is designed primarily for online retailers selling consumer goods where purchase hesitation is common. Fashion, footwear, electronics, homewares, and health and beauty brands see the highest conversion uplift. If your average order value sits between £50 and £500, Klarna's instalment options directly reduce the friction that causes shoppers to abandon their basket.

Brick-and-mortar retailers can also use Klarna through its in-store integration, which works via a QR code or link sent to the customer's phone. It is not a full point-of-sale system, so physical-only businesses that need a card terminal should look elsewhere. Klarna works best as a payment option alongside, not instead of, standard card processing.

Very small businesses processing fewer than around £5,000 a month are unlikely to see conversion benefits that justify the higher fee rates. At that volume, the additional cost compared with a standard card processing rate of around 1.4% could outweigh any basket-size increase. Klarna is a stronger fit for established online stores looking to compete with larger retailers that already offer BNPL at checkout.

Klarna Features

• Pay in 3: Splits the customer's purchase into three interest-free monthly payments. Klarna pays the merchant the full amount upfront, typically within two to five business days. This is Klarna's most-used product in the UK.
• Pay in 30: Gives customers 30 days to pay after delivery, useful for fashion and high-return-rate categories where shoppers prefer to try before committing.
• Klarna Card: A Visa card that lets customers use Klarna's BNPL features in stores and online without a merchant needing a specific Klarna integration. Merchants process a standard Visa transaction.
• Klarna Checkout: A hosted checkout page that replaces your existing payment page with Klarna's own branded flow, combining BNPL and standard card payment in one interface.
• On-site Messaging: Embeds eligibility messaging and payment calculators directly on product and basket pages, showing customers how much each instalment would cost before they reach checkout.
• Klarna Merchant Portal: A web dashboard for managing orders, processing refunds, downloading settlement reports, and viewing dispute cases. Most merchants find it functional rather than outstanding.
• Plugins and API Integration: Pre-built plugins for Shopify, WooCommerce, Magento, and Salesforce Commerce Cloud. Direct API integration is available for custom builds, with documentation through Klarna's developer portal.
• Klarna Disputes: A managed process for handling customer payment disputes. Klarna acts as the intermediary, which removes some chargeback risk from the merchant but also reduces direct control over dispute outcomes.

Klarna Fees and Pricing for UK Merchants in 2026

Klarna does not publish a fixed public rate card in the way that Stripe or Square do. Fees are negotiated based on your monthly volume, sector, and average order value. Published merchant reports and industry data point to a starting rate of approximately 0.99% plus 35p per transaction for Pay in 3 and Pay in 30. For context, a £100 order would cost the merchant around £1.34 in Klarna fees, compared with roughly £1.39 for a standard consumer Visa card at a blended rate of 1.39%.

The headline rates can look competitive, but volume-based pricing means smaller merchants typically pay more per transaction than the figures Klarna uses in its marketing. Businesses processing under £10,000 a month should request a specific quote rather than assuming the published rate applies. Larger retailers processing over £500,000 a month can negotiate meaningfully lower rates.

There are no setup fees for standard integrations using Klarna's Shopify or WooCommerce plugins. Custom API integrations carry development costs that Klarna does not subsidise. Refunds do not attract an additional fee, but Klarna does not return the original transaction fee when a refund is processed, which is consistent with most payment processors.

Klarna does charge consumers a service fee on some products in certain circumstances, such as a £0.99 fee on Pay in 30 in some markets. In the UK, Pay in 3 remains interest-free and fee-free for consumers as of August 2026, but merchants should check current terms before advising customers, as Klarna has adjusted its consumer fee structure in other markets.

Klarna vs Clearpay: How Do They Compare for UK Merchants?

Klarna and Clearpay are separate companies with no shared ownership. Klarna is a Swedish fintech founded in Stockholm in 2005. Clearpay is the UK trading name of Afterpay, an Australian company now owned by Block, Inc. (formerly Square). They are not the same product, not linked operationally, and not part of the same group.

Both providers offer interest-free instalment payments for UK shoppers, and both pay merchants in full upfront. The differences lie in how instalments are structured, product range, and regulatory status.

For most UK online retailers, Klarna has a broader product range and a larger existing customer base. Clearpay's fortnightly payment schedule suits some shoppers better for smaller purchases. Klarna's Pay in 30 option is a meaningful differentiator for fashion and high-return-rate categories where Clearpay has no equivalent. On fees, Clearpay's published starting rate of around 6% is substantially higher than Klarna's 0.99% plus 35p, though both require negotiation at scale.

Neither provider is straightforwardly better for every merchant. Your choice should depend on your average order value, return rate, and which provider your target customers already use. Compare Card Fees is a free, independent advisory service that has helped UK businesses find better card payment deals since 2012. See how Klarna compares to PayPal Pay in 3 for UK merchants or read our guide to BNPL for UK merchants.

Pros and Cons

Pros

• Merchant gets paid in full upfront: Klarna absorbs the credit risk. You receive the full order value within two to five business days, regardless of whether the customer keeps up with their instalments.
• Higher average order values: Klarna's own merchant data reports average order value increases of 30–45% after integration. Independent retailer case studies broadly support uplifts in the 20–35% range.
• Wide platform support: Ready-made plugins for Shopify, WooCommerce, Magento, and Salesforce Commerce Cloud mean most online retailers can be live within one to two days without custom development.
• Pay in 30 reduces return friction: Shoppers in high-return categories such as fashion are more likely to complete a purchase if they can try items before payment clears, which can increase conversion rates.
• No fixed-term contract: Standard merchant agreements do not lock you in for 12 or 24 months. You can exit without a termination penalty in most cases.
• Larger UK customer base than Clearpay: Klarna has more active UK shoppers than Clearpay, which matters for conversion — a shopper already set up with Klarna can complete checkout faster.

Cons

• Opaque pricing: Klarna does not publish a clear rate card. You need to request a quote and compare it carefully. Smaller merchants are unlikely to receive the rates referenced in Klarna's marketing materials.
• Not FCA-authorised: Klarna operates in the UK under its Swedish Finansinspektionen licence. UK BNPL regulation has been in development since 2022 but had not fully commenced as of August 2026. Regulatory change could affect your integration and consumer protections available to your customers.
• Dispute resolution favours the customer: Klarna handles disputes directly with the customer. Merchants report having limited visibility into decisions and sometimes find refunds issued without their input. This is a genuine weakness compared with standard card chargeback processes where you can submit evidence directly.
• Not suitable as a standalone payment method: Klarna does not support all card types or standard one-time card payments across all plans. You will still need a separate payment gateway for customers who want to pay in full by card immediately.
• Higher fees for low-volume merchants: At £5,000 monthly volume, the blended cost of Klarna can exceed that of standard card processing, without the conversion benefit being guaranteed. The economics only clearly favour Klarna at higher volumes and average order values.
• Consumer service fees in some markets: Klarna has introduced consumer-facing service fees in certain markets. UK terms were unchanged as of August 2026, but merchants should monitor this, as consumer reluctance to pay fees could reduce BNPL uptake.

Alternatives to Klarna for UK Merchants

Klarna is not the only BNPL option available to UK merchants. The right alternative depends on your average order value, sector, and whether you need a provider with FCA authorisation.

• Clearpay: Splits payments into four fortnightly instalments. Good for lower-value purchases where fortnightly scheduling suits your customer base. Published starting fees are around 6% per transaction, which is higher than Klarna's starting rate. No Pay in 30 equivalent.
• PayPal Pay in 3: Available through existing PayPal Business accounts. Zero additional integration cost if you already use PayPal. Broad consumer recognition. Fees are bundled into PayPal's standard merchant rates, making direct comparison with Klarna harder. Compare Klarna and PayPal Pay in 3 for UK merchants.
• Stripe (with BNPL options): Stripe supports Klarna and Clearpay as payment methods through its payment intents API, so it is not a direct BNPL alternative but can host both alongside standard card payments. Read our Stripe UK review.
• Openpay / Laybuy: Smaller BNPL providers with UK presence but significantly lower merchant network and customer recognition than Klarna or Clearpay.

For merchants processing over £50,000 a month, it is worth requesting quotes from at least two BNPL providers and comparing them against each other, not just against standard card rates. Use our free comparison tool to get quotes matched to your volume and sector.

Is Klarna Right for Your Business?

Klarna makes commercial sense for UK online retailers with an average order value above £50 and a monthly card volume above £10,000. At that level, the conversion and basket-size benefits typically outweigh the higher transaction fees. Fashion, electronics, and homewares retailers in particular have reported measurable revenue gains after adding Klarna at checkout alongside their existing card processor.

It is a harder case to make for service businesses, B2B merchants, or any retailer where the average transaction is below £30. The 35p fixed element of the fee makes low-value orders expensive, and the BNPL mechanic is less compelling to customers buying a service than a physical product. Physical-only retailers should also weigh whether their customers will engage with a QR-code-based in-store flow before committing to integration work.

Before signing with Klarna, get a written quote with your specific rate confirmed and compare it against alternatives such as Clearpay or PayPal Pay in 3. Compare Card Fees is a free, independent advisory service that has helped UK businesses find better card payment deals since 2012. If you would like help comparing Klarna against other BNPL and payment providers suited to your volume and sector, use our free comparison tool or speak to one of our advisers.