How to read your UK merchant statement, line by line

Most UK independent business owners file the merchant statement that arrives in their inbox every month, give it a one-line glance, and move on. The figure at the bottom is roughly what they expected, the bank has been paid, the salon or restaurant is open tomorrow morning. That is the moment quietly costly mistakes get made.

A UK merchant statement is a packed two-page document with twelve to fifteen line items, most of them in jargon. Hidden surcharges, wrong card-tier classifications, and surprise PCI penalties all sit inside it. The Payment Systems Regulator's final report on the card scheme and processing fees market review was explicit: a lack of effective competition has let acquirers raise charges to the point that most merchants do not realise how much they are paying or why. The way you fight that is by reading the document.

This guide walks through every line on a typical UK merchant statement, explains the jargon in plain English, flags the three places money is most often hidden, and finishes with a five-minute audit you can run on your next statement.

The eight sections every UK merchant statement contains

Every UK provider's statement is laid out slightly differently. Underneath the formatting, every one has the same eight blocks:

1. Business header — your trading name, MID (merchant ID), the period covered.
2. Summary of activity — gross volume processed, transaction count, average basket size.
3. Pricing tier breakdown — qualified, mid-qualified, and non-qualified rates if you are on a tiered plan, or the blended rate if you are on a flat plan.
4. Interchange and scheme fee detail — only on interchange-plus or IC++ statements.
5. Acquirer charges — the percentage and per-transaction markup the provider keeps.
6. Compliance charges — PCI fee, non-compliance surcharge if it has triggered.
7. Hardware and ancillary charges — terminal rental, gateway fees, replacement card fees.
8. Net settlement summary — gross volume minus all charges, equals what hit your bank account.

If you cannot find one of these sections on your statement, that is the first thing to ask your provider about. A missing pricing-tier breakdown often means you are on a default tier you were not told about.

What every common line actually means

Here is the plain-English glossary. Read these once and your next statement will look like English.

Gross volume

Total value of card transactions processed that month, before any fees. Always includes refunds applied against the same period — if you ran a busy month but processed a lot of refunds, your gross will look smaller than your headline takings.

Transaction count

Number of payment authorisations completed. Worth dividing your gross volume by this number every month to track your average basket size. Sudden movement in either direction is usually the first sign that something has shifted — a price rise that customers are absorbing, a new service that is selling, or a staff member who is not pushing add-ons.

Blended rate (also called "flat rate" or "qualified rate")

A single percentage applied to every transaction regardless of card type. Simple to read on the statement. Worse value than interchange-plus for businesses with large transaction values, because the provider has factored in higher-margin card types when setting your rate.

Interchange

The fee paid to the cardholder's bank. For domestic UK consumer cards, capped at 0.20 per cent on debit and 0.30 per cent on credit. On an interchange-plus statement, this appears as a separate line. On a blended statement, it is buried inside the headline rate.

Scheme fees

Paid by the acquirer to Visa or Mastercard. Typically around 0.05 per cent. Almost always invisible on blended statements; itemised on interchange-plus statements.

Acquirer markup (or "processor margin")

The slice your provider keeps. The only line where competition does any work. Reasonable in 2026 for a UK independent doing £30k-£100k monthly card volume is between 0.20 and 0.50 per cent. Above 0.60 per cent is high. Above 0.80 per cent is overpaying.

Authorisation fee

A flat per-transaction charge of 1-3p. Adds up fast on high-volume, low-basket businesses. A coffee shop doing 12,000 transactions a year at 3p pays £360 a year just in authorisation fees.

PCI compliance fee

Most UK acquirers charge £5-10 a month for managing PCI Data Security Standard compliance on your behalf. A handful include it. Check what yours does.

Non-compliance surcharge

The fee that costs UK small businesses the most accidentally. Triggered when you miss the annual PCI self-assessment questionnaire (SAQ) deadline. Typically £15-30 a month, and it keeps charging every month until you log into your acquirer portal and complete the SAQ. For most small businesses on a hosted card-not-present setup, the SAQ takes about an hour. The fee can run for years before someone notices.

Terminal rental

The monthly fee for the physical card machine. Currently £15-30 a month for a typical wireless terminal. Check for a separate "SIM card" or "connectivity" charge on top.

Gateway fee

Appears if you take online payments through a payment gateway (Stripe, Worldpay, Opayo, Dojo's gateway, etc.). Either a small monthly fee or a per-transaction charge. Both can show up on the same statement if you have e-commerce alongside in-person sales.

Chargeback fee

Charged each time a customer disputes a transaction with their card issuer. Typically £10-25 per chargeback, win or lose. If you see more than one or two in a quarter, you have a process problem to fix.

Net settlement

What actually arrived in your bank account. Gross volume minus everything above. The number you want to reconcile against your bank feed.

The three lines where money is most often hidden

If you only check three things on your next statement, make it these.

1. Non-compliance surcharge

Already covered above. Most common surprise on UK small business statements. If you see it, log into your acquirer portal today and complete the SAQ.

2. Acquirer markup vs the rate you were quoted

Take the acquirer markup line. Divide it by your gross volume. Compare against the rate the salesperson quoted you when you signed up. If the divided number is meaningfully higher than the quoted rate, you have probably been moved into a higher pricing tier — either by hitting a card-mix threshold, a volume threshold, or because your contract has rolled into an out-of-contract default tier.

3. Ancillary fees that have no explanation

Look for any line under "ancillary", "other", "service fees", or similar. If it does not have a clear English label, screenshot it and ask your provider in writing what triggered it.

Worked example — spotting a £40 overcharge on a real statement

Take the statement in the illustration at the top of this page. A UK salon doing £42,310 in card sales over March 2026.

The headline blended rate looks reasonable at 0.79 per cent. The acquirer markup line at £313.09 works out at 0.74 per cent — but the salesperson originally quoted 0.55 per cent. That is a 0.19 percentage-point overcharge, worth roughly £80 a month on this volume.

The PCI compliance fee of £8 is in range. The non-compliance surcharge of £30 should not be there at all and indicates the SAQ was missed last year. That has been costing this business £30 a month for six months unnoticed — £180 already gone, with another £30 about to hit unless they complete the SAQ this week.

Total avoidable overcharge: roughly £110 a month, or £1,320 a year on a £500,000 annual card volume. Worth half a day of attention.

Your 5-minute statement audit

Run this on the next statement that lands.

1. Find the period and the MID. Confirm both are yours and the period is the one you expected.
2. Read the gross volume and transaction count. Divide one by the other for your average basket. Note any sudden movement against last month.
3. Find the acquirer markup line. Divide it by gross volume. Compare to the rate you were quoted when you signed up. Flag the gap.
4. Find the PCI compliance line. If you cannot find it, check the contract — some providers bundle it. If a non-compliance fee is shown, prioritise the SAQ today.
5. Find the ancillary or other fees section. Read every line. If any line does not have a clear English label, write the question down for your provider.
6. Reconcile net settlement with the bank feed. It should match. If it does not, your settlement timing has shifted — usually nothing to worry about, but worth confirming.
7. Stash the statement. HMRC requires you to keep self-employment records for at least five years. Six years is the safer default for company accounts. Keep merchant statements as long as you keep your other bookkeeping.

The whole thing takes five minutes once you have done it twice.

When to escalate — three signs you should switch

Three patterns suggest the right move is not to call your provider but to get re-quoted.

Pattern 1: Your acquirer markup has crept up by more than 0.1 percentage points across six months. Markup creep is real. Providers raise the rate quietly between annual reviews and bank on customer inertia. The UK Finance data on UK card spending shows total card volumes growing 5-7 per cent a year in 2024-2025 — your processing costs should not be growing faster than your revenue.

Pattern 2: A non-compliance fee that started in a previous month has continued past your SAQ completion. Some providers keep charging for months after compliance is back in place. If you see this, ask in writing for a refund and put a date on a switch decision.

Pattern 3: Three or more "ancillary" or "service fee" lines you cannot explain in plain English. That usually means you have rolled onto a fees-heavy default tier. Switch.

Where Reeve Consult fits

We are an authorised Dojo Partner. If you would rather not pick this apart yourself, send us your last three statements and we will read them, work out your real cost, and quote a Dojo rate based on your actual card volume. You can also download the free Card Processing Rate Analyser — drop in three months of statement numbers and it shows you your true blended rate against current UK benchmarks.

For context on what the underlying fees actually are, see our pillar credit card processing fees UK explainer. For sector-specific notes, see our pages on UK restaurants, UK retail, and UK salons and clinics.