The short answer
An authorisation fee is a charge for a payment approval request. Its billing rules depend on your provider and agreement; a declined request can still be chargeable on some plans. Multiply the applicable pence fee by the billable request count, convert pence to pounds, and include it in the total-cost comparison.
In this guide
What the fee relates to
When a payment is submitted for authorisation, information is checked through the payment network and issuing bank. Global Payments describes its electronic authorisation fee as a charge for processing that request. It is distinct from a percentage charged against the value of a payment.
Do not assume 'transaction fee' always means the same billing event. A quote may distinguish an authorisation request, a completed sale or a pre-authorisation. Ask which events are counted and where you can see that count on a statement.
Can a declined payment incur a fee?
Yes, depending on the agreement. Tyl's published pricing explanation says its flat authorisation fee applies when a transaction is authorised or declined. That is a provider-specific example, not a statement that every UK plan works identically.
A completed-sales count may therefore be too low for estimating a request-based charge. Reconcile the provider's chargeable quantity rather than guessing. If repeated failures are occurring, investigate the cause with support and follow the provider's instructions before retrying.
Compare a café and a garage
For an invented 3p fee, a £10 payment has an additional cost equivalent to 0.30% of its value. On a £500 payment, the same 3p is 0.006%. The pence amount has not changed; its importance relative to the payment size has.
At £20,000 monthly card sales, 2,000 chargeable payments at 3p cost £60. If the same volume comes from 200 chargeable payments, the cost is £6. Add the applicable percentage charges and fixed fees before deciding which quote is lower.
Keep an eye on percentage-point arithmetic
Suppose one illustrative quote has a percentage rate 0.2 percentage points lower, but a 3p charge that the other does not have. On a £10 payment the lower rate reduces the cost by 2p, while the request fee adds 3p. On those assumptions the transaction is 1p more expensive.
The break-even payment value for just that difference is £15: £0.03 divided by 0.002. This ignores other costs and assumes one billable request per payment. It is a way to check quote arithmetic, not a recommended price or a benchmark for your business.
Before you change the payment setup
Separate a pricing concern from a reliability concern. Lowering a pence fee does not by itself fix connectivity or issuing-bank declines. Record the error message, time, affected area and support response without collecting cardholder information in this website.
For a quotation review, use a representative month's actual request count where possible. If the plans bill different events, ask for a tailored comparison instead of forcing both into a single assumption. Awais can discuss the complete proposal available through his role.
Your comparison checklist
| Illustrative sale value | 3p as a percentage of the sale |
|---|---|
| £5 | 0.60% |
| £10 | 0.30% |
| £30 | 0.10% |
| £100 | 0.03% |
| £500 | 0.006% |
Common questions
Is an authorisation fee the same as the percentage processing charge?
No. A quote can include both. One is linked to the billable event count; the other is linked to the value processed.
Does a zero authorisation fee guarantee the lowest cost?
No. Compare percentage rates, rental, services, minimum charges and the applicable card categories too.
Should I estimate transactions from turnover divided by average sale?
That can be a starting estimate for completed sales. It may not capture other billable requests. Replace it with the statement count when available.
Sources and method
Public sources checked on 7 September 2026. Offers can change; your individual proposal and signed terms determine what applies.
Global Payments: authorisation and other fee definitions Tyl by NatWest: pricing and authorisation-fee explanationWorked examples are illustrative mathematics, not provider quotes or promised savings. Read our editorial approach.
Apply this to your business
Use summary figures for a free check, then choose whether to discuss your requirements with Awais.