Non-Integrated Fees, Surcharging, and Hidden Costs: What Your Card Setup Might Be Adding to Your Bill

Open your merchant statement and look at the bottom line. Most business owners look at this number and accept it. Fewer read every line above it.

The total is made up of components. Some you knew about when you signed. Some you may not have. And some arrived after you signed, when a supplier changed their product, changed their pricing, or changed the infrastructure your account depends on.

The components of your merchant service charge

Every card transaction generates a cost that flows through several parties. What appears on your statement as a single percentage rate or a single monthly fee is typically the sum of three or more underlying charges.

Interchange is the fee paid by your acquiring bank to the card issuer. For consumer cards, this is capped by the PSR (Payment Systems Regulator) at 0.2% for debit and 0.3% for credit. For commercial cards, there is no cap and the rate varies by card product.

Scheme fees are paid to the card network: Visa, Mastercard, or American Express. These are not capped and have increased for some card types in recent years. They appear in your cost whether you are on blended or interchange-plus pricing.

Acquirer margin is the processing company's charge for operating your account. This is the component you can most directly negotiate, particularly when renewing a contract or switching provider.

Under blended pricing, all three appear as a single percentage. Under interchange-plus pricing, they appear separately. If you are on blended pricing, you are paying all three but cannot see them individually.

Non-integrated payment fees

This is a charge that many businesses discovered only when it appeared on their statement, not when they signed their EPOS contract.

A non-integrated fee is charged by an EPOS provider when a business uses a third-party card terminal rather than the EPOS provider's own payment processing product. The fee is applied at the software level. It may appear as a monthly flat charge or as a per-transaction addition.

The commercial logic behind it is straightforward: EPOS providers who have developed their own payment product want to recover processing revenue from customers who choose to use a competitor's terminal instead. The fee creates a financial incentive to switch.

Whether the fee was clearly disclosed when the original EPOS contract was signed matters. If it was not, and it has appeared on recent statements, that is grounds for a formal complaint to the provider. The fact that it was mentioned somewhere in the contract terms does not necessarily mean it was clearly disclosed as a material cost.

If you have recently had a card terminal integration removed or deprecated, check your current EPOS invoices for any new line items that were not present previously.

Minimum monthly charges

A minimum monthly service charge is a floor that ensures the payment provider earns a minimum revenue from your account regardless of how many transactions you process.

The mechanics work as follows: if your total transaction fees for the month are £25 and your minimum monthly charge is £35, you pay £35. If your total transaction fees are £50 and your minimum is £35, you pay £50. The minimum only activates when your transaction fees fall below it.

This matters most for businesses with seasonal trading patterns, businesses that close for extended periods, or businesses that have seen a reduction in card transaction volume. A card machine sitting unused during a closure period can still generate a monthly cost if a minimum charge applies.

Many minimum monthly charges were clearly disclosed at sign-up. Some were not. Checking your current contract for the relevant clause and comparing it against your most recent statement will tell you whether the charge is being applied correctly.

Terminal rental costs

Terminal rental contracts have their own terms, separate from your merchant account agreement. The rental term, monthly cost, and early termination fee are specified in the rental agreement.

Terminal rental charges continue for the full term of the agreement regardless of whether the terminal is in use. If a terminal has been removed from service, whether because an integration was deprecated, because you have switched provider, or for any other reason, the rental charge continues until the contract term ends or you formally terminate.

Terminating a terminal rental early typically incurs a fee. The fee is usually calculated as the remaining monthly payments or a fixed sum specified in the contract. Know this figure before you make any decision about switching terminal providers.

PCI DSS fees and compliance

PCI DSS (Payment Card Industry Data Security Standard) is the security framework that governs how card data is handled. Payment processors are required to maintain compliance, and they may pass a portion of that cost to merchants.

PCI compliance fees appear on some merchant statements as a monthly or annual charge. They are not universal: some processors absorb the cost; others charge it separately.

A non-compliance fee can also appear if your account fails annual attestation. Attestation typically involves completing a self-assessment questionnaire confirming that your business handles card data securely. If this is not completed within the required period, a higher non-compliance fee may apply automatically.

If you see a PCI-related charge on your statement and you are not certain what it covers or whether you are compliant, ask your processor for clarification in writing.

Chargeback fees

A chargeback occurs when a customer disputes a transaction with their card issuer rather than the merchant. The card issuer reverses the transaction and recovers the funds from the acquiring bank, which then recovers them from the merchant.

Most processors charge a fee per chargeback, regardless of whether the dispute is resolved in the merchant's favour. Fees vary by processor but are typically in the range of £10 to £25 per disputed transaction.

Chargebacks are expensive relative to the transaction value for small-value sales. A £15 transaction disputed as a chargeback may generate a £20 fee plus the loss of the original sale. Understanding chargeback risk by card type and transaction type is relevant for businesses with higher dispute rates.

How to read your statement line by line

Request a full itemised statement from your processor if you do not already receive one. Compare every line item against:

Your original merchant agreement. Every charge on your statement should be traceable to a clause in the contract you signed. If a charge is present on your statement but absent from your agreement, request a written explanation.

The same period last year. Comparing statements across twelve months shows when new charges appeared and whether any rates have changed without clear notification.

Your processor's current published fee schedule. Some processors publish standard fee schedules. Comparing your statement rates against the published schedule confirms whether you are on the terms you agreed or whether undisclosed changes have occurred.

If you find charges you did not agree to, raise a formal written complaint to your processor. UK-regulated payment service providers are required to have a complaints process, and unresolved complaints can be escalated to the Financial Ombudsman Service after eight weeks.