Credit Card Processing Fees Explained: A Complete UK Guide for 2026

Every time a customer taps, dips, or enters their card details online, a series of fees are deducted before the funds land in your business account. Understanding these fees is the first step to reducing them — and keeping more of each sale.

How Card Processing Fees Work

Card processing fees in the UK are made up of three core components, often bundled into a single "merchant service charge" (MSC) by your payment processor. Here's what's really going on behind the scenes:

1. Interchange Fees

Interchange is the largest component, typically making up 70–90% of the total fee. It's set by the card schemes (Visa and Mastercard) and paid by the acquiring bank (your payment processor) to the issuing bank (your customer's bank). Since January 2016, EU regulations have capped interchange fees at:

• 0.2% for consumer debit card transactions
• 0.3% for consumer credit card transactions
• Commercial/corporate cards are not capped and can range from 1.5% to 2.5%+

Post-Brexit, cross-border interchange fees for UK-EU transactions have risen significantly — Visa and Mastercard increased these to 1.15% for debit and 1.5% for credit in late 2021.

2. Scheme Fees (Assessment Fees)

Visa and Mastercard charge scheme fees for using their network infrastructure. These are typically 0.02%–0.05% per transaction, but have been rising steadily. Scheme fees are rarely shown separately on your statement but are baked into your rates.

3. Acquirer Margin (Processor Markup)

This is what your payment processor actually earns. It's layered on top of interchange and scheme fees. Depending on your provider and negotiation, this can range from 0.1% to over 1%. This is the only part of the fee you can negotiate.

Common Fee Structures

Blended Pricing

Most small business providers (Stripe, Square, SumUp) use blended pricing — a single flat rate like 1.75% per transaction. It's simple but often more expensive for businesses with high debit card usage, since debit interchange is much lower than the blended rate.

Interchange++ (IC++)

Interchange++ pricing passes through the actual interchange and scheme fees, then adds a fixed markup. This is the most transparent model and is usually cheaper for businesses processing over £10,000/month. Example: Interchange (0.2%) + Scheme (0.03%) + Acquirer (0.15%) = 0.38% total.

Tiered Pricing

Transactions are categorised into "qualified," "mid-qualified," and "non-qualified" tiers with different rates. This model lacks transparency and is generally the most expensive — avoid it if possible.

Other Fees to Watch Out For

How to Reduce Your Card Processing Fees

• Compare providers regularly — Rates change and new competitors enter the market constantly. Use Merchant Insight to benchmark your costs.
• Negotiate IC++ pricing — If you process more than £10,000/month, push for interchange++ pricing for maximum transparency.
• Encourage debit over credit — Debit interchange is 0.2% vs 0.3% for credit. For businesses with high average transaction values, the difference adds up.
• Avoid long contracts — Look for rolling monthly agreements or 12-month maximum terms.
• Check for hidden fees — PCI non-compliance, minimum monthly charges, and authorisation fees can significantly increase your effective rate.
• Optimise your MCC — Your Merchant Category Code affects interchange rates. Ensure you're classified correctly.

Average Processing Fees by Provider (UK, 2026)

Rates are indicative. Actual rates depend on business type, turnover, and card mix. Get a free personalised quote to find your exact costs.