How to read your merchant statement and find your real rate
Last updated: August 2026 · Rates checked: August 2026
Quick answer: find your gross card turnover for the month, add up every fee line on the statement (merchant service charge, authorisation fees, PCI, minimum monthly service charge, terminal rental), then divide total fees by turnover. That percentage is your effective rate, and it is the only number worth comparing. In our worked example below, £231.36 of fees on £12,400 of turnover comes out at 1.87%.
Merchant statements are the least readable documents in small-business finance, and that is not entirely an accident. The headline rate you were quoted sits in one line; the money actually leaving your account is spread across six or seven. This guide walks through the statement line by line, then does the one calculation that cuts through all of it. You need fifteen minutes, one monthly statement, and a calculator.
Step 1: find your gross card turnover
Somewhere near the top of the statement is the total value of card sales you processed that month, before any fees came out. Providers label it differently: “total card turnover”, “total sales value”, “gross sales” or “amount processed”. It is usually broken down by card type (debit, credit, business cards) with a total at the bottom. Write the total down. If your statement only shows the net amount paid into your bank, add the fees back on to reconstruct the gross figure, because dividing fees by a net figure overstates your rate.
Step 2: list every fee line
Now go through the charges section and write down every line with a pound sign next to it. On a typical UK statement you are looking for five or six recurring characters:
- Merchant service charge (MSC). The percentage of each sale, and almost always the biggest line. It may be one blended figure, or split by card type with debit cheapest and business or commercial cards dearest. Our card machine fees guide explains how interchange and scheme fees build up underneath this number.
- Authorisation fees. A few pence charged every time the terminal contacts the bank for approval, whether or not the sale completes. Individually invisible; on hundreds of transactions a month they add up. Our authorisation fees explainer shows exactly how much, and which pricing models skip them entirely.
- PCI compliance fee. Typically £5 to £15 a month for the security compliance programme. Watch for its evil twin, the PCI non-compliance fee of £20 to £50 a month, charged when you have not completed the annual questionnaire.
- Minimum monthly service charge. If your MSC for the month falls below a set floor, the provider tops the difference up. It only bites in quiet months, which is exactly when you can least afford it.
- Terminal rental. The monthly hire charge for the card machine itself, sometimes billed on a separate invoice. Include it: it is a cost of taking cards.
- Everything else. Statement or paper billing fees, chargeback fees, gateway fees. If it has a pound sign, it goes on the list.
Step 3: the worked example
Here is a realistic month for a small café: £12,400 of gross card turnover across 620 transactions (a £20 average sale), on negotiated acquirer pricing.
| Statement line | How it is calculated | Cost |
|---|---|---|
| Merchant service charge | 1.49% × £12,400 | £184.76 |
| Authorisation fees | 620 transactions × 3p | £18.60 |
| Terminal rental | Fixed monthly | £20.00 |
| PCI compliance fee | Fixed monthly | £8.00 |
| Total fees | £231.36 | |
| Effective rate | £231.36 ÷ £12,400 | 1.87% |
Notice what happened: the café thinks it pays 1.49%, because that is the rate on the contract. It actually pays 1.87%, roughly a quarter more, once the pennies and fixed fees are counted. Neither number is a scandal, but only one of them is true, and only the true one can be compared against another provider’s quote.
Step 4: judge the number against your volume
An effective rate means nothing without context, because fixed fees weigh more heavily at low turnover. The benchmarks below are pure arithmetic on the pricing we track on our card machine rates page: pay-as-you-go readers at a flat 1.69% to 1.75% with no monthly fee, and negotiated acquirer pricing at 1.2% to 1.9% plus £10 to £60 a month in fixed fees.
- Under £4,000 a month: a flat 1.75% with no fixed fees is a perfectly good effective rate, and fixed-fee deals struggle to beat it. At £2,500 of turnover, even a low 1.2% rate plus £30 of fixed fees is £30.00 + £30.00 = £60.00, an effective 2.40%, worse than 1.75% flat (£43.75).
- Around £5,000 a month: the crossover zone. 1.4% plus £20 of fixed fees is £70.00 + £20.00 = £90.00, an effective 1.80%; a keen 1.2% plus £20 is £80.00, or 1.60%. Anything much above 1.9% effective here deserves a phone call.
- £10,000 a month: negotiated pricing should be winning clearly. 1.4% plus £40 of fixed fees is £140.00 + £40.00 = £180.00, an effective 1.80% at worst; 1.3% plus £30 comes out at £160.00, or 1.60%. An effective rate above 2% at this volume means something on the statement needs fixing.
- £20,000 a month and up: the negotiated range starts at 1.2%, and fixed fees shrink to noise: 1.2% plus £60 is £240.00 + £60.00 = £300.00, an effective 1.50%. Rates at this volume are genuinely negotiable, so use that.
Red flags while you are in there
Four things worth circling in red pen. First, a merchant service charge percentage that is higher than the one on your contract: rates creep at renewal, and few businesses re-check. Second, a PCI non-compliance fee, which usually means an annual questionnaire went unanswered and is pure waste. Third, a minimum monthly service charge appearing in quiet months, a sign the pricing model no longer fits your volume. Fourth, fee lines you cannot name. If a line defeats you, ask the provider in writing what it is; you are entitled to an answer. Our guide to hidden card machine fees covers the full rogues’ gallery, and if the total feels high, the diagnostic in why is my card machine bill so high works through the causes in order of likelihood.
What to do with the number
Once you have an effective rate, you have leverage. If it is comfortably inside the benchmarks above, file the statement and re-check in six months. If it is not, you have two options: negotiate with your current provider armed with the real number, or get comparison quotes and let the market do the negotiating. Our step-by-step guide to reducing card processing fees covers the negotiation route in detail.
Want us to do the arithmetic for you?
Tell us your monthly card turnover and what you currently pay, and we will run the comparison at your volume across the providers we track. Free, no obligation, and if you are already on a good deal we will say so.
Frequently asked questions
What is an effective rate on a merchant statement?
Your effective rate is every fee on the statement added together, divided by your gross card turnover for the same month. It is the only number that lets you compare providers fairly, because it captures the headline rate plus all the fixed fees, authorisation pennies and extras that quotes leave out.
What card turnover figure should I use, gross or net?
Use gross card turnover: the total value of card sales processed before any fees are deducted. Most UK statements label it as total card turnover, total sales value or amount processed. If your statement only shows the net amount settled to your bank, add the fees back on to get gross.
What is a good effective rate for a UK small business?
It depends on volume, because fixed fees weigh more at low turnover. Below roughly £4,000 to £5,000 a month, a flat pay-as-you-go rate of about 1.69% to 1.75% with no monthly fees is hard to beat. Above that, negotiated pricing of 1.2% to 1.9% plus £10 to £60 a month in fixed fees usually produces a lower effective rate, provided the fixed fees stay modest.
How often should I check my merchant statement?
Do the full effective-rate calculation at least twice a year, and always in the month after your contract anniversary, because that is when repriced rates and renewed fees tend to appear. A five-minute skim each month for new fee lines catches most problems early.