Card Processing Fees Explained
For most businesses, card processing fees are the biggest headache. Even though some people still prefer cash, not accepting cards can mean missing out on sales.
Your monthly merchant statement probably shows a flat rate, like 1.5% plus 20p per transaction. This simple number actually hides a mix of wholesale costs, network charges, and the processor’s profit.
Understanding exactly what you are paying for is the first step to taking control of your payment processing costs. When you know which fees are non-negotiable legal caps and which are purely your provider's profit margin, you gain the leverage to negotiate better rates.
Here is the complete breakdown of what actually happens to your money between the moment a customer taps their card and the moment the funds land in your business bank account.
Card Processing - What Happens
Every time you process a card payment, a lot happens in the background.
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Cardholder/ your customer - makes the payment for goods or services received.
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The issuer (issuing bank) - Your customers' bank releases the money via their debit or credit card.
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Card network - the money travels through the money network used by the bank (e.g. Mastercard, Visa and American Express).
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Acquirer (Payment Processor) - the company that supplies your card machine and will deposit the money into your chosen account.
Each of the last three entities takes a specific fee. Some providers have set up charges, others, like TakePayments, offer free setup.
Interchange Fees (The Bank's Cut)
The interchange fee is the wholesale cost of processing a transaction. It is paid directly to the customer’s issuing bank to cover the cost of handling the funds and the risk of fraud.
This is the largest component of your processing cost. It is strictly regulated. In the UK and Europe, interchange fees for consumer cards are capped by law:
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UK Consumer Debit Cards: Capped at 0.2% per transaction.
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UK Consumer Credit Cards: Capped at 0.3% per transaction.
These caps only apply to domestic consumer cards. If your customer pays with a corporate business card, a commercial purchasing card, or an international card issued outside the UK/EEA, the interchange fee is entirely unregulated. A commercial credit card transaction can carry an interchange fee of 1.5% to 2% or more.
Scheme Fees (The Network's Cut)
Scheme fees are paid to the card networks (Visa, Mastercard, etc.) for the privilege of using their infrastructure to route the transaction securely.
These fees are incredibly complex, based on a massive matrix of factors including transaction volume, cross-border routing, and secure authentication methods. However, for a standard transaction, the scheme fee usually ranges between 0.01% and 0.05% of the transaction value.
Like interchange, scheme fees are non-negotiable and are passed directly through by your acquirer.
Acquirer Markup (The Processor's Profit)
This is the most important fee for you to understand because this can be negotiated.
The acquirer markup is the margin your payment provider (the acquirer) adds on top of the interchange and scheme fees. It covers their operational costs, customer support, the technology they provide (like your card machine or payment gateway), and their profit.
If your provider charges you a flat rate of 1.5% for a debit card transaction, but the true cost (interchange + scheme) is only 0.25%, the acquirer is keeping the remaining 1.25% as their markup.
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Authorisation Fees
Many contracts include a fixed fee per transaction (e.g., + 10p, + 20p). This is the authorisation fee, charged every time your terminal pings the network to check if the customer has sufficient funds, regardless of whether the transaction is approved or declined.
If you run a high-ticket business (like a furniture store), a 20p flat fee on a £500 sofa is mathematically irrelevant. But if you run a coffee shop, a 20p fee on a £3 flat white instantly eats away nearly 7% of your revenue on that single sale. High-volume, low-value merchants must negotiate this flat fee as close to zero as possible.
PCI Compliance and Hidden Extras
Beyond the per-transaction costs, your monthly statement may include several recurring administrative fees.
PCI DSS Compliance Fees: The Payment Card Industry Data Security Standard (PCI DSS) is a set of security protocols that all merchants must follow. Most providers charge a monthly fee (typically £5 to £15) to help you maintain compliance.
PCI Non-Compliance Fines: If you fail to complete your annual PCI self-assessment questionnaire, your provider will heavily penalise you, often adding £30 to £50 per month to your bill until you comply.
Minimum Monthly Service Charge (MMSC): If your business is seasonal and you process very few transactions in a given month, your provider may enforce an MMSC. If your contracted MMSC is £20, and you only generate £12 in transaction fees that month, the provider will bill you an extra £8 to make up the difference.
Chargeback Fees: If a customer disputes a transaction and their bank reverses the charge, your provider will hit you with an administrative penalty—usually between £15 and £25 per dispute, regardless of who wins the dispute.
Pricing Models: Blended vs. Interchange
How your provider packages all these fees together drastically impacts your bottom line. There are two primary pricing models in the UK:
Blended Pricing
You are charged a single, flat percentage for all transactions (e.g., 1.5% for all credit and debit cards).
The Pro: It is incredibly easy to understand and predict your costs.
The Con: You are overpaying on cheap cards. When a customer pays with a UK debit card (capped at 0.2% interchange), the provider pockets a massive profit margin. The provider absorbs the risk for expensive corporate cards, but you foot the bill on the average transaction.
Interchange Pricing
This model separates the fees exactly as they are billed. You pay the exact Interchange fee (+), the exact Scheme fee (+), and a fixed Acquirer Markup (e.g., 0.3%).
The Pro: Ultimate transparency. If interchange fees drop, or a customer uses a cheap debit card, those savings are passed directly to you. This is almost always cheaper for businesses processing over £50,000 annually.
The Con: Your monthly statements will be much longer and harder to read, as every transaction type carries a slightly different rate.
How to Lower Your Processing Fees
Assess Your Volume: If you process more than £50,000 to £100,000 a year, ask your provider to move you to an Interchange pricing model.
Negotiate the Markup: Armed with the knowledge that interchange and scheme fees are fixed, push back solely on the acquirer's markup percentage and the pence-per-transaction authorisation fee.
Stay PCI Compliant: Never pay non-compliance fines. Set a calendar reminder every year to complete your portal's security questionnaire.
Shop Around at Renewal: The payment processing market is highly competitive. Once your initial 12-month contract is nearing its end, use your current effective rate as leverage to secure better terms elsewhere.
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What is the difference between Blended Pricing and Interchange Pricing?
Blended Pricing: Charges a single, flat percentage (e.g., 1.5%) for all transactions. It is easy to understand, but it often means you are overpaying when customers use cheaper cards, like domestic debit cards.
Interchange Pricing: Separates the fees exactly as they are billed (Interchange + Scheme + Acquirer Markup). It is more transparent and usually much cheaper for businesses processing over £50,000 annually, though the monthly statements are more complex to read.
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Why are flat pence-per-transaction fees dangerous for small businesses?
Fixed Authorisation Fees (e.g., 10p or 20p per transaction) disproportionately impact businesses with high volumes of low-value sales.
For example, a 20p fee on a £3 coffee takes away nearly 7% of your revenue for that single sale. If you run a low-ticket business, you need to negotiate this flat fee as close to zero as possible.
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What is a PCI non-compliance fine?
The Payment Card Industry Data Security Standard (PCI DSS) requires all merchants to follow specific security protocols. If you fail to complete your mandatory annual self-assessment questionnaire, your provider will penalise you with non-compliance fines, which often add an unnecessary £30 to £50 to your monthly bill.
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Are business credit cards more expensive to process than personal debit cards?
Yes. In the UK, interchange fees for consumer debit and credit cards are capped by law at 0.2% and 0.3%, respectively.
However, corporate business cards, commercial purchasing cards, and international cards are completely unregulated. Processing a commercial credit card can carry an interchange fee of 1.5% to 2% or more.