How to read your merchant statement: a UK walkthrough

What are the key takeaways?

• Your merchant statement breaks down into three core cost layers: interchange (paid to the cardholder's bank), scheme fees (paid to Visa or Mastercard), and the acquirer margin (your provider's markup).
• Most UK small businesses never read their statement [anecdote] and overpay by hundreds of pounds a year as a result.
• A "blended rate" bundles all three layers into one percentage, making it impossible to see where your money actually goes.
• Once you can read each line, you can challenge your provider on every charge that looks wrong.
• Our free rate comparison benchmarks your statement against current market rates in under five minutes.

What actually is a merchant statement?

A merchant statement is the monthly document your card payment provider sends to show what they charged you for processing card transactions. It lists every fee category, the number of transactions you processed, and the total amount deducted before your takings reached your bank account. Think of it as your card machine's phone bill.

According to UK Finance (2024), UK businesses processed over 21.9 billion debit and credit card transactions in a single year. Every one of those transactions generated a statement line for the business that accepted the card. Yet most small business owners we speak to [anecdote] have never opened the PDF or logged in to view their statement online.

If you run a restaurant, salon, pub, or any other business that takes card payments, your statement is the single most important document for understanding what you actually pay for payment processing. Not what you were quoted. What you pay.

What are the three cost layers on every statement?

Every card transaction you accept has three separate costs baked into it. Your statement may show them individually or, more commonly, lump them together. Understanding these three layers is the difference between knowing your costs and guessing.

Interchange is the fee paid to the bank that issued your customer's card. If a customer pays with a Barclays Visa debit card, Barclays receives the interchange. These rates are set by Visa and Mastercard, published openly, and your provider cannot negotiate them down. For a standard UK consumer debit card, interchange is currently capped at 0.2% of the transaction value. Consumer credit cards are capped at 0.3%. These caps were introduced by the EU's Interchange Fee Regulation (2015) and remain in force in the UK post-Brexit under retained law.

Scheme fees go directly to Visa or Mastercard for using their network. These cover things like network access, fraud protection infrastructure, and settlement processing. Scheme fees are typically small, often between 0.02% and 0.05% per transaction [estimate], but they add up across hundreds or thousands of monthly transactions. Your provider passes these through at cost, or sometimes marks them up.

Acquirer margin is the only part your payment provider actually controls. This is their profit. It covers the service they provide: the terminal, the app, the settlement into your bank account, the customer support line. This is the number you should negotiate, because it is the only number that is genuinely variable.

The Payment Systems Regulator (PSR, 2023) found that the acquirer margin for small and medium merchants varied by as much as 300% between providers for equivalent transaction profiles. That means you could be paying three times what the business next door pays for identical processing.

Why does a blended rate hide your real costs?

A blended rate bundles interchange, scheme fees, and the acquirer margin into one flat percentage. Your provider charges you a single number on every transaction, say 1.4% or 1.6%, with no breakdown and no visibility into what you are actually paying for. That structure makes it very difficult to identify where your money goes.

Blended pricing is popular with providers because it is simple to explain at the point of sale. It is also popular because it disguises margin. When your interchange cost on a UK debit card is 0.2%, but you are paying a blended rate of 1.4%, the provider is keeping roughly 1.2% on that transaction. On a credit card at 0.3% interchange, they keep about 1.1%. On a premium or commercial card where interchange might be 1.5% or higher, they might actually lose money on that single transaction, but they make it back many times over on the cheaper debit cards.

[opinion] Blended rates are not inherently dishonest. They serve businesses that want simplicity and predictability. But if you process more than a few thousand pounds a month, you owe it to yourself to understand what sits inside that blend.

The alternative is interchange-plus pricing (sometimes called IC+ or cost-plus). This model breaks out the interchange and scheme fees at cost, then adds a fixed acquirer margin on top. You see exactly what Visa and Mastercard charge, and exactly what your provider charges. We explain the full comparison in our guide to card processing fees.

How do authorisation fees affect high-volume businesses?

Authorisation fees are small fixed charges, typically between 1p and 5p, applied every time a card is presented and the terminal requests approval from the card network. They appear as a separate line item on your statement. For businesses with many low-value transactions, these fees can add a significant hidden percentage on top of your quoted rate.

This is the part that catches out high-volume, low-value businesses. A busy coffee shop processing 800 transactions a month at an average of £4.20 per sale turns over roughly £3,360 [estimate]. The percentage fees on that are manageable. But 800 authorisation charges at, say, 3p each adds another £24, which is equivalent to adding 0.7% on top of whatever percentage rate you thought you were paying.

According to the British Retail Consortium's Payments Survey (2023), the average cost of accepting a card payment for retailers was 0.63% of transaction value. But that headline number masks the fixed-fee component, which disproportionately affects smaller-ticket businesses like cafés, bakeries, and pubs selling individual drinks.

When you read your statement, divide your total authorisation charges by your total transaction value. That gives you the effective authorisation cost as a percentage, and it might surprise you.

How can I stop paying PCI non-compliance penalties?

PCI DSS stands for Payment Card Industry Data Security Standard. It is a set of security requirements, maintained by the PCI Security Standards Council, that any business handling card data must meet. Your provider charges you a monthly PCI compliance fee, typically between £3 and £7 per month, to cover the cost of validating that your business meets these standards. The good news is that the most common penalty, a non-compliance surcharge, can be removed in about 20 minutes.

Here is the catch. Many providers also charge a PCI non-compliance fee if you have not completed your annual Self-Assessment Questionnaire (SAQ). This fee can be £30 to £50 per month [estimate], and it often runs silently for months before anyone notices. We have reviewed statements [anecdote] where a salon owner had been paying a £39.99 monthly non-compliance penalty for over two years without knowing it. That is nearly £960 for something that takes about 20 minutes to fix.

The PCI Security Standards Council (2024) publishes free guidance for small merchants completing the SAQ. Your provider should give you access to an online portal where you complete it annually. If they have not, call them and ask. It is one of the quickest ways to cut a recurring cost from your statement.

What should I check about terminal rental and minimum monthly charges?

Two line items on your statement are fixed costs that catch business owners off guard: terminal rental and minimum monthly service charges. Both are negotiable, and both are commonly overlooked after the initial contract period ends. Understanding where you stand on each could save you hundreds of pounds a year.

Terminal rental is the monthly fee for your physical card machine. If you signed a contract with a fixed term, this is usually locked in for 12 to 48 months. Check whether your initial contract period has ended. Many businesses continue paying the same rental after their minimum term [anecdote], even though they could renegotiate or switch to a provider with lower hardware costs.

Minimum monthly service charges (sometimes called "minimum monthly fees" or "MMSC") are a floor on what you pay each month. If your transaction fees do not reach a certain threshold, your provider tops up the bill to that minimum. For a seasonal business, a pub that closes for January, or a salon owner on holiday for a fortnight, this means you pay the minimum even when you process nothing.

The Federation of Small Businesses (FSB, 2023) reported that 38% of small businesses found it difficult to compare payment processing costs across providers. Hidden minimums and rental lock-ins are a big part of why.

How do I read my statement line by line?

The most practical thing you can do is pull up your most recent statement and walk through it section by section. Below is the order we use when reviewing statements for clients. Each section maps directly to a cost you can either verify or challenge.

1. Transaction summary. This section shows your total card turnover for the month, broken down by card type (debit, credit, contactless, online). Note the total value and the total number of transactions. You will need both.

2. Fee breakdown. Look for interchange, scheme fees, and acquirer margin listed separately. If you only see a single percentage or a single "processing fee" line, you are on a blended rate. That is not wrong, but it means you cannot see the components.

3. Authorisation charges. Find the line that shows per-transaction fees. Multiply the count by the unit cost to verify the total matches.

4. Monthly fixed fees. This includes terminal rental, PCI compliance (or non-compliance), gateway fees if you take online payments, and any minimum monthly charge.

5. Adjustments and chargebacks. If a customer disputed a payment, the reversed amount and any chargeback handling fee will appear here. Chargeback fees typically range from £15 to £25 per incident [estimate].

6. Net settlement. This is the amount actually paid into your bank account after all deductions. Compare it to your total transaction value. The difference is your total cost of acceptance.

A healthy total cost of acceptance for a UK SME processing mostly face-to-face debit card payments should sit somewhere around 0.5% to 0.8% of turnover [estimate]. If yours is above 1.2%, there is almost certainly room to renegotiate. You can benchmark your costs instantly with our free rate comparison tool.

What should I do if my statement looks too expensive?

Start by calculating your effective rate: take your total fees for the month and divide by your total card turnover. That single percentage tells you more than any line item on its own. If the result is higher than you expected, you have concrete evidence to take to your provider or to a broker who can benchmark it for you.

Next, compare. The PSR's Market Review into Card-Acquiring Services (2021) found that many small merchants could save between 10% and 40% on their processing costs by switching provider or renegotiating their existing deal. The review also found that most small merchants had never attempted to negotiate.

[opinion] In our experience at Reeve Consult, the businesses that benefit most from a statement review are those doing between £5,000 and £50,000 a month in card turnover. Below £5,000, the absolute savings are modest. Above £50,000, most owners have already negotiated or hired someone to do it. It is the middle ground where the biggest gaps sit.

If you want a second pair of eyes, that is exactly what we do. and the team review merchant statements every week. There is no obligation and no fee for the initial review. We want to understand your business first, then we look at the numbers and tell you what we see.

What do business owners most often ask about merchant statements?

How often should I review my merchant statement?

At minimum, once a quarter. Card scheme fees change twice a year [estimate] (April and October for Visa, typically), and your provider can adjust their margin with notice. A statement that looked competitive 18 months ago may not be competitive today.

Can my provider increase fees without telling me?

They must give you written notice, usually 30 to 60 days depending on your contract. But "written notice" often means an email you missed or a line in a PDF you did not open. Set a calendar reminder to read your statement every month.

What is the difference between interchange-plus and blended pricing?

Interchange-plus passes the card scheme costs to you at cost, then adds a fixed margin. You see every component. Blended pricing wraps everything into a single percentage. Interchange-plus gives you transparency. Blended gives you simplicity. For most businesses processing over £3,000 a month, interchange-plus will save money and give you the data to hold your provider accountable.

Are contactless transactions charged differently?

Not in terms of interchange. The interchange cap applies equally to contactless and chip-and-PIN for consumer cards. However, some providers charge a different authorisation fee for contactless versus chip-and-PIN, so check both lines on your statement.

What should you do next with your statement?

Your merchant statement is not just a bill. It is a negotiation tool. Every line item is either a cost you cannot change (interchange, scheme fees) or a cost you absolutely can (acquirer margin, PCI fees, terminal rental, authorisation charges).

Read it. Understand it. Then decide whether you are getting a fair deal. If you are not sure, start with our free rate comparison or explore our resources library for more guides like this one.