Short answer
Your effective rate is your total card processing costs for a month divided by your total card turnover for that month, shown as a percentage. It includes every fee, not just the headline rate, so it is the fairest way to compare two providers or two statements.
Part of Reading statements. Start with the main guide: How to read a merchant statement, line by line
Key takeaways
- Effective rate = all card fees in the month divided by card turnover in the month, times 100.
- Include every charge: percentage fees, per-transaction fees, monthly rental, PCI, gateway and any separate invoice.
- A provider with a higher headline rate can have a lower effective rate once monthly fees and per-transaction fees are counted.
- Small average sales make per-transaction fees weigh far more, so the same price list gives different effective rates to different businesses.
- Compare effective rates on the same turnover and card mix, never on a number quoted for a different business.
Ask three providers what they charge and you will get three different answers in three different formats. One quotes a percentage. One quotes a percentage plus a pence or cents fee. One quotes a flat monthly price. There is no way to compare those by eye.
The effective rate fixes this. It turns every charge on a statement into a single percentage of what the business took in card payments. It is the number consultants use, regulators refer to and savvy business owners ask for. This guide shows exactly how to calculate it, where people go wrong, and how to use it to judge a quote.
What is the effective rate?
The effective rate is the share of your card turnover that goes on card costs. If you took £10,000 on cards and paid £150 in total to accept them, your effective rate is 1.5%.
It is different from the headline rate, which is only the percentage a provider advertises. The headline rate leaves out per-transaction fees, monthly charges and other costs, so it nearly always understates what you really pay.
How do you calculate the effective rate?
The formula is short. The care is in getting the two inputs right.
- Add up every fee for the month. Include percentage charges, per-transaction fees, terminal rental, gateway or portal fees, PCI compliance charges, statement fees and any minimum monthly top-up.
- Find total card turnover for the same month. Use the figure on the statement, and note whether it is before or after refunds.
- Divide the fees by the turnover. Multiply by 100 to get a percentage.
For a business with £12,000 of card turnover and £186.00 of total fees: 186 ÷ 12,000 = 0.0155, so the effective rate is 1.55%.
Which turnover to use
Use the same basis every time. Gross turnover (before refunds) makes the rate look lower. Net turnover (after refunds) makes it look higher. Neither is wrong, but mixing them in a comparison is. If you are comparing a new quote with an old statement, work out both on the same basis.
What counts as a fee
Everything the business pays because it accepts cards, from interchange fees to the fixed charges in our guide to monthly fees on a card machine bill. That includes charges that arrive on a separate invoice, such as terminal rental billed by a different company. If a cost would disappear when the business stopped taking cards, it belongs in the total. If a statement leaves some of these out, you will need to find them elsewhere. See our guide to hidden fees on a merchant statement for where they hide.
Why does the headline rate mislead?
Here is a realistic comparison. A business takes £12,000 a month across 600 transactions, an average sale of £20. Two providers quote for it.
| Item | Provider X | Provider Y |
|---|---|---|
| Headline rate | 1.2% | 1.5% |
| Per-transaction fee | 5p | None |
| Monthly terminal rental | £25.00 | £0.00 |
| Percentage fees | £144.00 | £180.00 |
| Per-transaction fees | £30.00 | £0.00 |
| Monthly fees | £25.00 | £0.00 |
| Total cost | £199.00 | £180.00 |
| Effective rate | 1.66% | 1.50% |
Provider X looks cheaper on its headline rate. Once the 5p fee on 600 payments and the £25.00 rental are counted, it is £19.00 a month more expensive.
Provider X advertises the lower rate but costs more overall once every fee is included.
This is why the effective rate matters more than any single line on a price list. It is also why a quote without monthly fees is not a quote you can compare.
Why does the same price list give different results?
Per-transaction fees and fixed monthly fees do not scale with turnover. That makes the effective rate depend heavily on how a business sells. The most important driver is the size of the average sale.
A fee of 5p on every transaction adds 0.05 ÷ the average sale to the effective rate. On a small sale that is a lot. On a large sale it is almost nothing.
The fee is the same, the effect is not. Smaller average sales feel it most.
A coffee kiosk with a £5 average sale and a furniture shop with a £500 average sale can be on exactly the same price list and pay completely different effective rates. Anyone who tells you what a "good" rate is without asking about average sale size is skipping the most important question.
How do you use the effective rate to compare quotes?
When a provider or consultant gives you a quote, ask for three things so you can work out the effective rate yourself.
- Every rate and fee, including monthly and one-off charges.
- The turnover and number of transactions the quote assumes.
- The card mix assumed (debit, credit, commercial, international).
Then recalculate the effective rate on your own figures. If the quote only works for a turnover you do not have, it is not your quote. If the provider will not tell you what it assumed, treat that as a warning in itself.
Effective rate on annual and one-off fees
Some fees are billed yearly or once. Divide an annual fee by 12 and add it to the monthly total. For one-off costs such as set-up or hardware, spread them over the contract length. A £240 set-up fee on a 24-month contract adds £10.00 a month. Leaving these out can make a high-cost contract look cheap.
What mistakes do people make when calculating it?
- Leaving out fixed fees. Terminal rental, PCI and statement fees are fees. Skipping them is the single most common error.
- Using the wrong month. A seasonal business should compare like for like, or use a rolling average of several months.
- Mixing gross and net turnover. Pick one and use it for every statement.
- Ignoring tax. Be consistent about whether VAT or sales tax is in the fee total. Compare quotes on the same basis.
- Treating the result as fixed. The effective rate changes every month as turnover, sale size and card mix change. One month is a snapshot, not a rule.
A worked example from statement to rate
A statement shows the following for one month.
| Line | Amount |
|---|---|
| Card turnover (gross) | £8,400.00 |
| Transactions | 420 |
| Percentage fees | £109.20 |
| Per-transaction fees | £16.80 |
| Terminal rental | £18.00 |
| PCI compliance charge | £5.00 |
| Statement fee | £2.50 |
| Total fees | £151.50 |
The average sale is £8,400 ÷ 420 = £20.00. The effective rate is 151.50 ÷ 8,400 = 0.018036, or 1.80%. Of that, the fixed fees (£25.50) account for about 0.30 of a percentage point, the per-transaction fees for 0.20 and the percentage fees for 1.30.
- Percentage fees
- Per-transaction fees
- Fixed monthly fees
- Percentage fees 1.30% · Per-transaction fees 0.20% · Fixed monthly fees 0.30%
Example month: £8,400 turnover and £151.50 total fees.
Splitting the rate like this shows where a lower quote would need to save money. If most of the effective rate comes from fixed fees, negotiating the percentage will not help much.
What is a good effective rate?
There is no single answer, because the rate depends on the business. A business that takes mostly UK consumer debit cards in person on large average sales will have a very different rate from a business that takes international and commercial cards online on small sales.
Instead of chasing a benchmark, compare against three things:
- Your own history. Has your rate crept up over the last year with no change in how you sell?
- A quote on your own figures. What would the same month have cost with another provider?
- The components. How much is regulated or pass-through cost, and how much is the provider's own margin?
A calculator that works with your real figures does this in a minute. You can try it on the checkmyrates calculator, which shows the effective rate and splits the cost by card type.
Frequently asked questions
What is the effective rate in card processing?
It is the total of all card processing costs for a month divided by the card turnover for that month, shown as a percentage. It tells you what accepting cards really costs as a share of your sales.
How do I calculate my effective rate?
Add up every fee on your statement, including monthly and separately billed charges. Divide that total by your total card turnover for the same month, then multiply by 100.
Is a lower effective rate always better?
Usually, but check the contract. A very low effective rate can come with a long term, a high exit fee or hardware you must keep paying for. Compare the effective rate together with the contract terms.
Why is my effective rate higher than the rate in my contract?
The contract rate usually covers only the percentage fee. The effective rate also includes per-transaction fees, monthly charges and any non-standard card surcharges, so it is almost always higher.
Does the effective rate include VAT?
It depends on whether the fees on your statement include tax. Use the same treatment for every statement and quote you compare. Most comparisons are cleaner when tax is left out of both sides.
How often should I check my effective rate?
Check it on every statement and compare it with the last three months. Review it properly at least once a year and before any contract renewal.
Sources and further reading
- How to calculate your effective rate (Merchant Maverick) (opens in a new tab)
- Merchant fees explained (Shopify) (opens in a new tab)
- Merchant statement analysis for agents (Honick) (opens in a new tab)
- Payment Systems Regulator (UK) (opens in a new tab)
- Reserve Bank of Australia, payments and infrastructure (opens in a new tab)
Figures in this guide are examples to show the method. Fees, rules and rates change, so check your own statement, contract and current rules before you decide. This is general information, not financial or legal advice.