5 hidden costs in card payment processing (and how to spot them)
The headline rate quoted on the front page of a card processing brochure is almost never what you actually pay. The real cost lives in five line items most providers don't volunteer — and most business owners don't notice until they pull six months of statements.
Here's what to look for, why it's there, and how to push back.
1. PCI compliance fees
Most providers charge between £5–£20 per month for PCI compliance — sometimes more if you fail or ignore the annual self-assessment. It's legitimate, but it's almost never disclosed in the headline pricing.
Ask: 'What's your monthly PCI fee, and what happens if I fail to submit the SAQ on time?' Get the answer in writing.
2. Non-qualified or 'premium' card surcharges
Your quoted rate usually applies to standard UK consumer debit cards. Commercial, corporate, prepaid, international and rewards cards quietly cost 1–2.5% more. If half your customers are tourists or business buyers, your blended rate is nothing like the brochure rate.
3. Authorisation fees
A small fixed charge (typically 1p–4p) applied to every transaction, including refunds and declines. Sounds tiny — until you're processing 8,000 transactions a month and discover you've been quietly paying £320 in pure auth fees.
See transparent card-machine pricing4. Chargeback handling fees
When a customer disputes a payment, your provider charges an administrative fee — usually £15–£25 per case, regardless of who wins. Some providers stack additional 'investigation' fees on top. Always ask for the chargeback fee schedule before you sign.
5. Minimum monthly service fees
A floor that quietly tops up your bill if your transactions don't reach a set threshold. Seasonal businesses get hit hardest — you'll happily pay the floor in December, then bleed it in February.
Pull your last three monthly statements. Add up every line that isn't a transaction percentage. Divide by total turnover. That's your real effective rate.
"Transparent pricing isn't a marketing slogan — it's just an itemised statement you can actually read."
What 'good' looks like in 2026
- All fees disclosed in a single one-page summary before you sign.
- No 'rate review' clauses that let the provider hike mid-contract.
- PCI fee capped or included.
- Chargeback fees written out clearly.
- Monthly minimums removed or waived for seasonal traders.
- Headline rate ≠ effective rate.
- Always ask for an itemised quote, not just a percentage.
- Audit three real statements before renewing.
- Push back on PCI, auth and chargeback fees — there's room to negotiate.
- If a provider won't put fees in writing, walk away.
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