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In the UK, debit card fees typically cost businesses between 0.20% and 0.75% per transaction, while credit card fees range from 0.50% up to 2.5% or more, particularly for business, corporate and international cards. The difference comes down to interchange - the fee paid to the cardholder's bank - which is regulated for consumer debit and credit cards but uncapped for commercial and non-UK cards. Understanding this split is essential for any UK merchant trying to control their card processing fees, especially those with a high proportion of business customers or corporate spend.
Key Takeaways
- UK interchange fees are capped at 0.20% for consumer debit cards and 0.30% for consumer credit cards under the Interchange Fee Regulation (IFR), which still applies in UK law post-Brexit.
- Business, corporate and commercial cards are exempt from the IFR caps, so interchange on these can run to 1.5%-2% or higher, pushing your blended rate up significantly.
- Non-UK issued cards (EEA and international) attract much higher interchange, sometimes 1.15%-1.5% for credit, since the caps only apply to UK-domestic transactions.
- Your merchant statement should show separate line items for debit and credit interchange - if it does not, ask your provider for an interchange-plus breakdown.
- A high volume of American Express or corporate card payments can quietly inflate your blended processing rate, even if your headline "card machine rate" looks competitive.
- Encouraging debit card or bank-to-bank payments where practical (e.g. via Open Banking) can meaningfully reduce processing costs for high-ticket or B2B transactions.
- Switching to an interchange-plus pricing model, rather than a blended rate, gives you full visibility of exactly how much extra credit card transactions cost you.
Why Credit Cards Cost More to Process
The core reason credit card transactions cost more than debit card transactions is the interchange fee - the charge paid by your payment provider (the acquirer) to the cardholder's bank (the issuer) every time a card is used. This fee is baked into every transaction and is set by the card schemes (Visa and Mastercard) within regulatory limits, then passed on to you, the merchant, as part of your overall processing cost.
Since 2015, the UK has operated under the Interchange Fee Regulation (IFR), which caps interchange for consumer cards at:
- 0.20% of the transaction value for consumer debit cards
- 0.30% of the transaction value for consumer credit cards
These caps remained in place following Brexit, as the UK onshored the regulation into domestic law. However, the caps only apply to consumer cards issued within the UK. Business cards, commercial cards, and cards issued outside the UK fall outside this protection, which is precisely why credit card acceptance costs can vary so dramatically depending on who is paying and with what card.
Debit Cards: Lower Risk, Lower Cost
Debit cards draw funds directly from the cardholder's bank account, meaning there is no line of credit extended and lower risk of non-payment or chargeback fraud for the issuing bank. This lower risk profile is reflected in the lower interchange rate, and it is why debit transactions are almost always the cheapest to process, regardless of provider.
Credit Cards: Higher Risk, Higher Reward for Issuers
Credit cards involve the issuing bank extending credit to the cardholder, taking on repayment risk, and often providing rewards, cashback or points schemes that are funded partly through interchange revenue. This is why credit interchange sits higher than debit, and why premium, rewards-linked or business credit cards attract the highest fees of all - the issuer is funding more generous cardholder benefits and taking on more risk.
UK Interchange Rates by Card Type: The Real Numbers
The table below sets out typical UK interchange fee bands by card category. These are the wholesale costs your acquirer pays the issuing bank - your actual processing rate will include this plus the scheme fee and your provider's markup. For more detail on how these combine, see our guide to authorisation, scheme and minimum fees.
| Card Type | Typical UK Interchange Rate | Regulated Under IFR? | Notes |
|---|---|---|---|
| UK Consumer Debit | 0.20% (capped) | Yes | Cheapest category; flat fee options also common for low-value transactions |
| UK Consumer Credit | 0.30% (capped) | Yes | Applies to standard consumer credit and charge cards |
| UK Business Debit | 0.20%-1.15% | Partially | Some business debit falls outside IFR caps depending on issuer |
| UK Business/Commercial Credit | 1.0%-2.0%+ | No | Uncapped; often the largest cost driver for B2B merchants |
| EEA Consumer Debit/Credit | 0.20%-0.30% | Yes (EEA rules) | Similar caps apply under EU regulation for EEA-issued cards |
| Non-EEA/International Cards | 1.15%-1.90% | No | Common for tourist spend and overseas online customers |
| American Express | 1.5%-3.5% | No | Amex sets its own rates outside the Visa/Mastercard interchange model |
How This Shows Up on Your Merchant Statement
If your provider uses interchange-plus (or "cost-plus") pricing, your statement should break transactions down by card category, showing the interchange component, the scheme fee, and your provider's margin separately for each. This is the clearest way to see exactly how much more credit and business cards are costing you compared to standard debit. If you are on a blended rate instead, you will only see a single average percentage - which may look simple, but hides the fact that you are effectively subsidising higher-cost transactions with the savings from your debit volume.
For a full walkthrough of how to interpret every line on your statement, read our guide on how to read your merchant statement.
Blended vs Interchange-Plus Pricing
| Pricing Model | How It Works | Best For |
|---|---|---|
| Blended Rate | Single flat percentage applied to all transactions regardless of card type | Low card-mix businesses wanting simplicity and predictability |
| Interchange-Plus | Interchange + scheme fee passed through at cost, plus a fixed provider margin | Businesses with high transaction volumes or high credit/business card mix |
Why Your Card Mix Matters More Than Your Headline Rate
Two businesses taking £50,000 a month in card payments can pay very different total processing costs depending purely on their customer base. A high-street retailer with mostly consumer debit spend might see a blended average of 0.4%-0.6%. A B2B services firm invoicing corporate clients who pay by company credit card could see an average closer to 1.2%-1.8%, even with an identical "headline rate" quoted by their provider.
This is why comparing providers on advertised rates alone is misleading. What matters is how your specific card mix - the proportion of debit, consumer credit, business credit, and international cards you accept - interacts with each provider's pricing structure. Our card processing fees by business type guide breaks down typical mixes and costs across different UK sectors.
Sectors Most Affected by High Credit Card Mix
- B2B and wholesale suppliers - frequent use of business and corporate credit cards for large invoices
- Travel and hospitality - high proportion of international and rewards credit cards
- Professional services - law firms, accountants and consultancies often billed via corporate credit accounts
- High-ticket retail - furniture, jewellery and luxury goods, where customers use credit for cashback/rewards
What UK Businesses Can Do to Reduce the Impact
You cannot change interchange rates - they are set by the schemes and regulators - but you can control how much of your revenue passes through the most expensive categories, and how much margin your provider adds on top.
1. Move to Interchange-Plus Pricing
If you are currently on a blended rate and take a meaningful volume of business or international cards, switching to interchange-plus with a transparent, fixed markup (often 0.10%-0.30% plus a per-transaction fee) usually saves money and gives you full visibility of costs.
2. Offer Alternative Payment Methods
For high-value B2B transactions, offering bank transfer, Direct Debit or Open Banking payments alongside card acceptance can shift volume away from the most expensive interchange categories entirely, since these methods typically carry flat or much lower percentage fees.
3. Query Amex and International Card Surcharging
Where contractually and legally permitted, some B2B and travel merchants choose not to accept Amex, or route it through a separate, higher-priced acceptance channel, rather than absorbing the cost across their whole blended rate. Always check your terms before implementing any surcharge, as consumer surcharging has been banned in the UK since 2018 for card payments generally.
4. Review Your Provider's Margin Separately from Interchange
Since interchange is fixed and outside your control, the only genuinely negotiable part of your processing cost is your provider's margin and any scheme or authorisation fees layered on top. Our guide to negotiating lower card processing fees includes scripts and benchmark figures you can use in renewal conversations.
5. Audit Your Statement Quarterly
Interchange rates and scheme fees are reviewed periodically by Visa and Mastercard, and providers do not always pass on reductions promptly. A quarterly check against current published rates ensures you are not overpaying on categories that have since changed.
Common Mistakes UK Businesses Make
- Assuming all credit cards cost the same - consumer credit at 0.30% interchange is very different from a corporate credit card at 1.5%+.
- Not checking whether their provider passes through Amex separately - some bundle it into the blended rate at a cost well above what Amex actually charges them.
- Ignoring minimum monthly fees that make interchange-plus less attractive for very low-volume merchants - always compare total monthly cost, not just percentage rates.
- Failing to review contracts before switching - early exit charges can outweigh short-term savings; see our guide on early termination fees in merchant contracts before committing to a new provider.
How Providers Price Around These Differences
Most major UK acquirers and payment facilitators, including Worldpay, Elavon, Barclaycard, SumUp, Square and Stripe, structure their pricing around this debit/credit divide in one of two ways. Simplified providers aimed at small businesses (SumUp, Square, Zettle) typically charge a single flat rate per transaction regardless of card type, absorbing the interchange variance into one number for simplicity - convenient, but often more expensive if you take a lot of business or international cards. Larger acquirers serving higher-volume merchants generally offer interchange-plus as standard or on request, which is almost always cheaper once monthly card turnover exceeds roughly £10,000-£15,000.
Frequently Asked Questions
Why do credit cards cost more to process than debit cards in the UK?
Credit cards cost more because the interchange fee - the cut paid to the cardholder's issuing bank - is set higher for credit transactions to reflect the greater risk the issuer takes on and the cost of funding rewards schemes. UK consumer credit interchange is capped at 0.30% versus 0.20% for debit, but uncapped business and corporate credit cards can cost significantly more.
Are debit and credit card interchange fees regulated in the UK?
Yes, for consumer cards. The Interchange Fee Regulation caps UK consumer debit interchange at 0.20% and consumer credit interchange at 0.30%, and this remains UK law after Brexit. Business, commercial and non-UK issued cards fall outside these caps and can be charged much higher rates.
Why is my blended rate higher than the advertised rate my provider quoted?
Blended rates are an average across your entire card mix, so if you accept a higher proportion of business, corporate or international credit cards than a typical merchant, your true average will sit above the advertised "from" rate. This is why reviewing your actual card mix before comparing quotes is essential.
Does American Express cost more than Visa and Mastercard to accept?
Generally yes. Amex operates outside the standard interchange model and often charges providers, and therefore merchants, between 1.5% and 3.5%, compared with the capped 0.20%-0.30% for standard UK consumer Visa and Mastercard debit and credit transactions.
Can I charge customers extra for paying by credit card in the UK?
No. Since January 2018, UK law has banned surcharging on both consumer debit and credit card payments, meaning you cannot pass on card processing costs directly to customers as a separate fee for standard consumer transactions. Some B2B arrangements outside consumer protection rules may differ, but this should always be checked with a legal adviser.
What is the difference between blended and interchange-plus pricing?
Blended pricing charges one flat percentage across all transactions regardless of card type, offering simplicity but hiding the true cost breakdown. Interchange-plus passes through the actual interchange and scheme fee for each transaction plus a fixed provider margin, giving full visibility and usually working out cheaper for businesses with meaningful card volume or a mixed card base.
How can I find out my exact card mix?
Ask your current provider for a detailed transaction report or interchange breakdown covering the last three to six months, which should show the split between debit, credit, business and international cards. This data is the single most useful thing to have ready when comparing quotes from new providers, as it allows for a like-for-like cost comparison rather than a comparison of headline rates alone.
How Compare Card Fees Can Help
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Whether you are looking to reduce your card processing costs, switch provider, or understand what you are currently paying, our experts can help. Tell us about your business and we will find the best rates available.
