Merchant Account Fee Audit UK: Find Hidden Charges & Reduce Costs
Quick answer:A merchant account fee review examines the complete cost and suitability of your payment setup across ecommerce gateways, card machines, virtual terminals and combined payment channels. We Tranxact reviews the information supplied to identify charges, contract considerations and potentially suitable alternatives. Savings and provider approval are not guaranteed.
What does the review cover? We examine the charges and terms supplied, discuss your payment channels and identify options worth assessing. Keeping the current arrangement may be appropriate; switching is not the only outcome.
What should you have available? A recent processing statement, current provider and contract details, approximate monthly turnover, average transaction value and any website or software integration requirements. Start with a brief enquiry; do not send cardholder data or identity documents through the initial form.
Request a review of your business payment setup | Read client feedback
Written by Rav BainsRav Bains works with UK businesses to analyse payment setups, uncover hidden fees, and match merchants with more suitable providers based on their trading model and industry.
A headline transaction rate does not show every cost in a payment agreement.
Blended rates, PCI fees, authorisation charges, scheme fees, and admin costs can all stack up. Without a proper audit, it’s difficult to know whether you're paying a fair rate or significantly overpaying.
Independent payment bill and contract review
Not sure why your payment bill has increased, what an unfamiliar charge covers, or whether your billed rates match your agreement? Start with a brief enquiry to We Tranxact.
What we can review
- Your supplied statements, invoices and effective pricing agreements, within an agreed scope.
- Processing costs, gateway fees, terminal rental and other identifiable charges, with the included period and transaction volumes explained.
- Differences between billed charges and evidenced agreed pricing, missing information and practical questions for your provider.
- Genuine alternative quotes, where sufficient information allows a comparison using the same transaction mix and assumptions.
Blended and Interchange++ pricing
Blended: we compare billed rates and charge bases with the supplied agreement, checking inclusions and exceptions without adding included interchange or scheme costs again.
IC++: we distinguish reported interchange, scheme fees and acquirer markup. We can check evidenced agreed markup and other contractual charges. Independent validation of interchange or scheme charges is only included where the necessary applicable schedules and supporting transaction detail are available and that work has been expressly agreed. Otherwise these amounts are identified as unverified pass-through charges.
A discrepancy is a question to investigate, not automatic proof of an error or overcharging. Reserves and withheld settlements are distinguished from fees; settlement reconciliation is outside this review. We do not promise savings, provider acceptance or a switching recommendation. The review is not legal advice.
Worked example: when keeping your provider costs less
Illustrative figures only. A business takes £30,000 a month in card payments. Both options use the same sales volume, transaction count and card mix. Amounts exclude VAT where applicable.
| Cost | Stay | Switch |
|---|
| Monthly processing charges | £330 | £285 |
|---|
| Monthly terminal rental | £20 | £30 |
|---|
| Monthly gateway fee | £10 | £15 |
|---|
| Total monthly cost | £360 | £330 |
|---|
| One-off exit fee | £0 | £350 |
|---|
| One-off new provider setup fee | £0 | £100 |
|---|
| Total cost over 12 months | £4,320 | £4,410 |
|---|
Finding. Switching cuts the monthly bill by £30, but costs £90 more over the first year. At the same monthly difference, it takes 15 months to recover the one-off costs.
Next step. On these figures, stay for now if the current service still fits. Confirm your notice date, the exit fee and any other charges in writing, then compare again before renewal.
How to request a review
- Tell us your business name, current provider, approximate monthly card turnover and the issue you want checked. Mention whether you take payments online, in person or by phone.
- We confirm whether we can help and agree the scope, any fee and expected delivery time before detailed work begins.
- Before you share documents, we explain the transfer method and document access, retention and deletion arrangements.
- Any written findings are reviewed and signed off by We Tranxact before release, with evidence limitations explained.
Enquiry only: please do not attach statements, contracts, card numbers, security codes, identity documents or customer-level transaction data to the initial enquiry. This is a consultant-led service, not an instant online audit.
Enquire about a payment cost review
What is a merchant account fee audit?
A merchant account fee audit is a structured review of your payment processing costs. It looks at your full statement and breaks down exactly where your money is going.
This includes:
- Transaction fees
- Interchange vs blended pricing
- Monthly and annual charges
- PCI compliance fees
- Authorisation and gateway costs
- Hidden admin or service fees
Why review more than the headline transaction rate?
Payment statements may separate transaction charges, authorisation fees, gateway costs and other charges. Review the complete statement alongside the agreement to understand the comparison.
Without clarity, businesses often accept pricing that is higher than necessary or not aligned with their industry.
For context, payment providers operate within frameworks set by organisations such as the Financial Conduct Authority, while transactions run through networks like Visa and Mastercard.
How to calculate your effective rate
Your effective rate is one useful comparison measure. Settlement timing, reserves, integration costs, contract terms and support also matter.
Formula: (Total payment fees included in the review / corresponding processed payment value) x 100
This shows what percentage of your revenue is going to payment providers.
Hypothetical example: GBP 200 in included payment fees on GBP 10,000 processed in the same period gives an effective rate of 2.00%. State which charges are included and compare equivalent periods and payment channels.
Common hidden fees to look out for
Blended pricing markups
Blended rates combine multiple costs into one figure, often hiding the true margin being applied.
PCI compliance charges
These can appear as monthly or annual fees and vary widely between providers.
Authorisation fees
Charged per transaction, these can add up significantly for high-volume businesses.
Monthly minimum fees
If your processing volume is low in a given month, you may still be charged a minimum fee.
Real business example
Example: A supplement business approached us after struggling with their previous provider. By reviewing their setup, we identified inefficiencies and helped them move to a more suitable solution.
View case studiesWhat to do after your audit
Once you understand your costs, you can:
- Renegotiate your rates
- Switch to a more suitable provider
- Move to interchange-plus pricing
- Optimise your payment setup
Related payment issues we help solve
If you're experiencing payment problems, you're not alone. Many UK businesses face issues with reserves, frozen accounts, or hidden fees.
Want us to review your fees?
Start with a brief enquiry about your payment costs or an unexplained charge. We agree the review scope, any fee and document-handling arrangements before detailed work starts. Any written findings require We Tranxact review and sign-off.
Request a Fee ReviewRelated pages
Looking for a Stripe Alternative?
Many businesses start with Stripe but eventually compare other payment solutions as they grow, process higher transaction volumes, or require more tailored support and payment infrastructure.
Read our guide: Best Stripe Alternatives UK for Growing Businesses to compare merchant accounts, payment gateways, open banking, and other payment solutions.
UK merchant fee benchmarks for 2026
Want more context before changing provider or reviewing your rates? See our UK Merchant Fees Benchmark Report 2026 for a practical breakdown of fee ranges, pricing trends, and what businesses may be paying across different sectors.
You can also compare this with our Merchant Account Fee Audit UK page if you want to understand how your current costs stack up.
Are You Overpaying for Card Processing?
Many UK businesses pay more than necessary because they only review headline transaction rates and miss monthly charges, terminal rental, gateway fees, PCI fees, settlement costs, and contract terms.
Read our guide: How to Reduce Card Processing Fees to understand what to check before comparing payment providers.
FAQs
What is a good merchant fee percentage in the UK?
This depends on your industry and volume, but many businesses aim to keep their effective rate as low as possible relative to their model.
Can I reduce my payment processing fees?
Yes, reviewing your setup and comparing providers may help identify cost-saving opportunities.
How often should I audit my merchant account?
At least once per year or when your business model changes.
Is switching providers difficult?
Before switching, check your existing notice period, exit charges, terminal rental and any separate gateway agreement. Confirm approval and test the new payment route before deciding when to close the current service. Ecommerce integrations, recurring payments and stored payment details may need a separate migration plan.
