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Authorisation fees, scheme fees, and minimum monthly service charges are three separate line items that appear on nearly every UK merchant statement, and together they can total hundreds of pounds a year even for a modest-turnover business. Unlike your headline transaction rate, these charges are rarely discussed at sign-up and are often buried in the small print of your merchant services agreement. This guide explains exactly what each fee covers, what a fair UK market rate looks like in 2024/25, and which of these costs you can realistically challenge or reduce.
Key Takeaways
- Authorisation fees are charged on every transaction attempt, whether approved or declined, typically 1p to 5p per transaction in the UK.
- Scheme fees are set by Visa and Mastercard, not your provider, and cannot be negotiated away, though how they are presented on your statement can vary.
- Minimum monthly service charges guarantee your provider a baseline revenue, usually £5 to £30 a month, regardless of how little you process.
- These three fees combined can add £150 to £600+ a year to processing costs for a small business doing under £10,000 a month in card sales.
- Declined transactions still cost you money in authorisation fees, so poor card acceptance rates quietly inflate your bill.
- Some providers bundle these costs into a single "blended rate" while others itemise them separately, making like-for-like comparison difficult without a full statement review.
- Switching provider rarely removes scheme fees but can significantly reduce authorisation charges and minimum monthly commitments.
Authorisation Fees: What They Are and What They Cost
How Authorisation Fees Work
Every time a customer taps, inserts, or enters their card details, your payment terminal or gateway sends a request to the cardholder's bank asking whether the transaction can proceed. The bank returns an approval or decline in under a second, and this message exchange is what the authorisation fee actually pays for. It is a fixed, per-transaction charge levied by your acquirer or payment service provider to cover the cost of routing that request through the card networks and issuing bank systems.
Crucially, an authorisation fee is charged whether the transaction is approved or declined. If a customer's card is rejected due to insufficient funds, a security flag, or an incorrect PIN, your business still pays the authorisation fee for that attempt. This is a detail many merchants never realise until they read their statement line by line, as covered in our guide on how to read your merchant statement.
Typical UK Authorisation Fee Rates
Authorisation fees in the UK generally range from 1p to 5p per transaction, though some legacy contracts with high street banks charge as much as 8p to 10p. For a business processing 2,000 transactions a month, the difference between a 1p and a 5p authorisation fee is £96 a year, which sounds small until you multiply it across every terminal and every year of a multi-year contract.
Modern PSPs such as SumUp, Zettle, and Stripe often build the authorisation cost into their headline percentage rate rather than itemising it separately, which can make their pricing simpler to understand but harder to compare directly against a traditional merchant account with itemised fees.
Why Decline Rates Matter More Than Merchants Think
Because authorisation fees apply to declined transactions too, a business with a high rate of failed payments, common in subscription billing, high-ticket retail, or businesses with poor card reader hardware, pays more in authorisation charges than the raw sales volume suggests. Improving checkout design, keeping terminal firmware updated, and using card verification tools like AVS (Address Verification System) sparingly for low-risk transactions can all reduce unnecessary authorisation attempts.
Scheme Fees: The Charges You Cannot Negotiate
What Scheme Fees Actually Cover
Scheme fees are charges set directly by Visa and Mastercard (and, less commonly in the UK, Amex or Discover) for the use of their payment networks. These are not fees your acquirer invents or marks up arbitrarily; they are passed through from the card schemes themselves, meaning no UK provider, however large, can waive or discount them. Scheme fees fund the infrastructure, fraud prevention, and settlement systems that make card payments possible at all.
Scheme fees typically comprise several sub-components: an assessment fee (a small percentage of transaction value), a per-transaction fee, and sometimes additional charges for cross-border transactions or specific card products like commercial or premium cards. Since 2018, both Visa and Mastercard have restructured their scheme fee models multiple times, generally trending upwards, which is one reason many merchants have seen their overall processing costs creep up even when their headline interchange rate has stayed the same.
How Scheme Fees Differ from Interchange
It is easy to confuse scheme fees with interchange fees, but they are distinct charges. Interchange is paid to the cardholder's issuing bank, while scheme fees are retained by Visa or Mastercard for running the network itself. Both are regulated to some extent in the UK following the EU Interchange Fee Regulation (retained in UK law post-Brexit), but scheme fees have faced less regulatory scrutiny and have risen more sharply in recent years. For a full breakdown of how these different charges stack together, see our card processing fees glossary.
Can Scheme Fees Be Reduced?
Not directly, but the way they are presented and passed on to you can vary significantly between providers. Some acquirers absorb small scheme fee increases into their margin for a period before passing them on, while others pass through every increase immediately and in full. Providers offering "interchange plus scheme fees" pricing models are typically more transparent than blended-rate providers, because you can see exactly what portion of your bill is the unavoidable scheme cost versus the provider's own margin.
Minimum Monthly Service Charges
Why Minimums Exist
A minimum monthly service charge (sometimes called a minimum monthly fee, minimum processing fee, or MMF) guarantees the provider a baseline level of revenue from your account regardless of how much or little you actually process in a given month. If your calculated transaction fees for the month fall below the minimum threshold, you are charged the difference, or the minimum amount outright, instead of your actual usage-based total.
This structure exists because providers incur fixed costs, gateway access, statement generation, customer support, PCI compliance monitoring, regardless of your transaction volume, and the minimum fee ensures those costs are covered even for low-volume or seasonal merchants.
Typical Minimum Fee Levels in the UK
Minimum monthly service charges in the UK typically range from £5 to £30, though some legacy bank merchant accounts have set minimums as high as £45 to £50. Newer app-based and mobile PSPs (SumUp, Zettle, Square) often have no minimum monthly fee at all, instead relying purely on per-transaction percentage rates, which makes them attractive for very low-volume or highly seasonal businesses such as market traders or pop-up retailers.
Seasonal Businesses Are Most Exposed
Minimum fees disproportionately affect seasonal businesses, such as Christmas market stalls, summer ice cream vans, or holiday let hosts, who may process thousands of pounds in peak months and almost nothing the rest of the year. If your provider charges a £25 minimum and your quiet-month transaction fees only amount to £8, you still pay £25. Multiply that gap across six or seven quiet months a year and the minimum fee alone can exceed £100 to £150 annually in charges for volume you never generated.
How These Fees Compare Across Provider Types
| Provider Type | Typical Authorisation Fee | Scheme Fee Handling | Typical Minimum Monthly Charge |
|---|---|---|---|
| High street bank merchant services | 3p - 8p per transaction | Often bundled into blended rate, less transparent | £15 - £45 |
| Independent acquirer / ISO | 1p - 4p per transaction | Usually itemised separately (interchange plus scheme plus margin) | £5 - £20 |
| Modern PSP (Stripe, Worldpay online) | Built into blended percentage rate | Included in headline rate, not itemised | £0 - £10 |
| App-based mobile readers (SumUp, Zettle, Square) | Built into flat percentage rate | Included in headline rate | £0 (no minimum) |
| Enterprise / high-volume acquirer contracts | Negotiated, often under 1p | Fully itemised, often negotiated volume discounts on margin | £0 - £10 (often waived for volume commitments) |
A Real-World Example: How Much These Fees Add Up
Small Retailer Example
Consider a small independent café processing 1,800 card transactions a month with an average transaction value of £9. On a typical independent acquirer contract with a 2p authorisation fee, that is £36 a month in authorisation charges alone, or £432 a year. Add scheme fees averaging around 0.15% to 0.20% of transaction value (roughly £24 to £32 a month on £16,200 of monthly card turnover), and a £12 minimum monthly service charge that is comfortably exceeded by normal trading, and the café's non-negotiable "background" fees total somewhere between £700 and £800 a year, entirely separate from its headline interchange-plus-margin rate.
Seasonal Business Example
Now consider a seasonal outdoor events trader who only processes card payments for four months of the year but is billed a flat monthly account fee of £20 with a £15 minimum service charge year-round. Across the eight quiet months, that is £160 to £280 in fees for essentially no transaction activity, a cost that a no-minimum, pay-as-you-go PSP would eliminate entirely.
Can You Reduce Authorisation, Scheme, or Minimum Fees?
What You Can Negotiate
Authorisation fees and minimum monthly service charges are both negotiable, particularly if you have consistent transaction volume, a good payment history, or are willing to sign a longer contract term. Many merchants successfully negotiate authorisation fees down from 5p to 2p simply by asking, or by using a competing quote as leverage. Our guide on how to negotiate lower card processing fees includes scripts and benchmark figures you can use directly with your provider or a new prospective one.
What You Cannot Negotiate
Scheme fees themselves are fixed by Visa and Mastercard and cannot be discounted by any UK acquirer, however large your business. What can change is how transparently those fees are passed on to you, and whether your provider's margin on top of them is fair. This is why comparing the total effective rate across your whole statement, rather than just the headline percentage, matters far more than most merchants realise.
When Switching Provider Makes Sense
If your current provider charges high authorisation fees, a steep minimum monthly charge, and offers little transparency on scheme fee pass-through, switching providers can often deliver meaningful savings without any change to your actual card sales volume. Before switching, however, check your existing contract for early exit costs, since many legacy agreements include exit penalties that can offset short-term savings; our article on early termination fees in merchant contracts explains what these typically cost and how to avoid them in your next agreement.
Reading These Fees on Your Own Statement
Most UK merchant statements list authorisation fees as a separate line item, often labelled "authorisation fee," "auth fee," or simply "per-transaction fee," distinct from your percentage-based discount rate. Scheme fees may appear as "Visa scheme fee," "Mastercard scheme fee," or be folded into a single "network fees" line depending on your acquirer's statement format. Minimum monthly charges usually appear only in months where your transaction-based fees fall short, often labelled "minimum service fee" or "minimum monthly charge shortfall."
If any of these three fees are missing entirely from your statement, it does not mean you are not paying them, it likely means they have been folded into a single blended percentage rate, which can make it harder to spot increases or unfair pricing over time. Different business types face very different combinations of these charges depending on transaction volume and average ticket size, which our card processing fees by business type guide breaks down in more detail.
Practical Steps for UK Merchants
- Request an itemised statement breakdown from your current provider showing authorisation fees, scheme fees, and any minimum charges separately from your interchange and margin.
- Calculate your annual authorisation fee cost by multiplying your monthly transaction count by 12 and by your per-transaction fee, then compare this to competitor quotes.
- If you run a seasonal business, actively seek providers with no minimum monthly service charge rather than accepting a flat fee structure designed for year-round trading.
- Reduce unnecessary declined transactions by keeping terminal software updated and reviewing any fraud-screening settings that may be causing false declines.
- Ask any prospective new provider for a full 12-month cost projection based on your actual transaction data, not just a headline percentage rate.
Frequently Asked Questions
Do I still pay an authorisation fee if a transaction is declined?
Yes. Authorisation fees are charged for the act of requesting approval from the cardholder's bank, not for a successful sale, so declined, cancelled, and reversed transactions still incur the fee. This is why businesses with high decline rates often pay more in authorisation costs than their sales volume alone would suggest.
Can I avoid paying Visa and Mastercard scheme fees?
No, scheme fees are set directly by the card networks and apply to every transaction processed on their networks, regardless of which UK acquirer or PSP you use. What you can influence is how transparently your provider passes these fees on and how much margin they add on top.
Why does my merchant statement not show a separate scheme fee line?
Many blended-rate providers, including several popular app-based PSPs, fold scheme fees into a single all-in percentage rate rather than itemising them separately. This can make pricing simpler to understand upfront but harder to audit for increases over time, so it is worth asking your provider directly for a breakdown if this matters to you.
What is a fair minimum monthly service charge in the UK?
A fair minimum monthly service charge for a small to medium UK business typically sits between £5 and £15, with many modern PSPs charging no minimum at all. Anything above £25 to £30 a month should prompt questions, particularly if your transaction volume is modest or seasonal.
Do all UK card processing providers charge these three fees?
Scheme fees apply universally since they are set by Visa and Mastercard themselves, but authorisation fees and minimum monthly charges vary significantly by provider and pricing model. Pay-as-you-go and app-based PSPs often eliminate the minimum monthly charge entirely, while traditional bank merchant accounts are more likely to include all three as separate itemised costs.
How much could I save by switching provider because of these fees alone?
For a business processing 2,000 transactions a month, moving from a provider charging 5p authorisation fees and a £25 minimum to one charging 1p and no minimum could save upwards of £1,000 a year, before even considering differences in the headline percentage rate. The exact saving depends heavily on your transaction volume, average ticket size, and existing contract terms.
Should I ask for a full cost breakdown before signing a new contract?
Yes, always request an itemised quote showing authorisation fees, scheme fee handling, and any minimum monthly charge before signing, rather than relying on the headline transaction rate alone. Reputable UK providers should be willing to provide this breakdown, and reluctance to do so is often a warning sign worth taking seriously.
How Compare Card Fees Can Help
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Whether you are looking to reduce your card processing costs, switch provider, or understand what you are currently paying, our experts can help. Tell us about your business and we will find the best rates available.
