Line by Line: What Twenty Fuel Cards Really Cost Beyond the Pence-Per-Litre Rate
Photo: fuel card invoices calculator desk fleet manager UK office, via www.sciencing.com
A fuel-card renewal rarely turns on the headline rate alone. The quoted pence-per-litre figure is memorable, comparable and easy to put in a spreadsheet. The invoice is less cooperative. It arrives with transaction charges, out-of-network surcharges, replacement-card costs and VAT lines that sit around the fuel itself. For a twenty-van fleet, those adjacent charges can add a meaningful amount to the effective cost of every litre — and they are often the difference between the cheapest quote and the cheapest contract.
The rate on the pump is not the rate on the invoice
Fuel cards are priced in layers. The headline rate applies to fuel, usually quoted excluding VAT. The service around that fuel — authorising a transaction, settling a purchase at a site outside the agreed network, replacing a lost card, running the online portal — carries its own charges. Individually, each line looks administrative. Across twenty vans and more than a thousand monthly fills, they become a pence-per-litre figure in their own right.
The audit task is therefore not to dispute the headline rate. It is to reconstruct the total monthly cost, divide it by litres purchased, and compare that effective rate with the contract and with competing offers. A card quoted at 139.7p per litre can be more expensive than one quoted at 141.9p once the invoice is opened.
Four charges that turn a headline into a total
Transaction fees. These are charged per fill, per authorisation or per statement line. A fee of £1.10 sounds modest until it is multiplied by 1,150 monthly transactions. The fleet should know whether the fee is capped, whether it applies to failed authorisations, and whether it varies by site type.
Out-of-network surcharges. A driver who fuels at a non-network site may trigger a fixed charge, a pence-per-litre premium or both. The contract should define the network precisely. In practice, the definition can shift: a site may be in-network for diesel but out-of-network for AdBlue, or in-network for card-present transactions but not for unattended pumps.
Replacement and administrative charges. Lost cards, damaged cards, additional cards for agency staff and portal fees all appear here. These are controllable costs, but only if the replacement policy is written down and the card count is reconciled monthly.
VAT treatment. Fuel is standard-rated at 20%, and a VAT-registered business can usually recover the VAT subject to holding valid evidence. Card fees are a separate supply. Most providers standard-rate transaction and service charges, and a valid VAT invoice should show fuel and fees separately. If fees are bundled into the fuel line, ask for a breakdown. Do not assume the headline rate is VAT-inclusive, and do not treat a card statement as a VAT invoice without checking.
A month of twenty vans, reconstructed
Take a fleet of twenty light commercial vehicles running 62,000 litres in a month across 1,150 transactions. The headline rate is 139.7p per litre excluding VAT. The contract includes a £1.10 transaction fee, a £2.20 out-of-network charge, a £12 replacement-card fee, a £1.25 monthly card fee and a £45 portal charge. Eight per cent of transactions are out-of-network.
| Invoice line | Basis | Monthly cost |
|---|---|---|
| Fuel | 62,000 litres at 139.7p | £86,614.00 |
| Transaction fees | 1,150 at £1.10 | £1,265.00 |
| Out-of-network charges | 92 at £2.20 | £202.40 |
| Replacement cards | 6 at £12 | £72.00 |
| Card fees | 20 at £1.25 | £25.00 |
| Portal charge | Fixed | £45.00 |
| Total | £88,223.40 |
The effective rate is 142.3p per litre, not 139.7p. The fees add 2.6p per litre. That is the number to benchmark, because it is the number the fleet actually pays.
A competing card quoted at 141.9p per litre looks dearer at first glance. But if it charges £1.75 per transaction, £2.50 for out-of-network use and no card or portal fee, the monthly total is £90,220.50 — an effective rate of 145.5p per litre. The cheaper headline is £1,997.10 more expensive across the month. The comparison only becomes visible when the invoice is rebuilt line by line.
Reconciling the invoice against the contract
A workable audit does not require a finance department. It requires a clean statement and a disciplined hour.
First, export the month’s transactions and separate fuel from fees. Match every fee line to a contract clause. If the contract says the transaction fee is £1.10, the invoice should show £1.10 — not £1.10 plus a separate authorisation charge under another name.
Second, reconcile the card count. The number of active cards should match the number of vehicles and authorised users. Replacement cards should be evidenced by a lost-card report. A card that appears twice in the fee line is a question for the provider.
Third, test the out-of-network definition. Pull the site list and compare it with the transactions that attracted a surcharge. If drivers are being charged for sites the provider’s own locator shows as in-network, the contract definition needs to be tightened.
Fourth, calculate the effective pence per litre for the fleet and for each card. A single card can distort the average through repeated out-of-network use or failed authorisations. The fleet average is useful for renewal; the card-level view is useful for driver follow-up.
Benchmarking each fee before renewal
The renewal conversation should not begin with the headline rate. It should begin with a one-page schedule showing what the contract says, what the invoice shows and what the gap is. For each fee, record the contract rate, the invoiced rate, the volume it applies to and the monthly cost. Include the notice period and any minimum-spend condition, because a low headline rate tied to an unachievable volume commitment is not a low rate in practice.
Ask for the fee schedule in writing, including the definition of an out-of-network site, the treatment of failed authorisations and the replacement-card policy. Ask how VAT is shown on the invoice and whether fees are itemised separately. A provider that cannot answer those questions clearly is adding risk to the renewal, not just cost.
The one-page challenge sheet
The challenge sheet should fit on a single page and carry three columns: contract says, invoice shows, gap. The rows should cover the headline pence-per-litre rate, transaction fee, out-of-network charge, replacement-card fee, card or portal fee, minimum spend, notice period, VAT breakdown and effective pence per litre at the fleet’s actual volume.
That last row is the one to take into the meeting. It converts every administrative charge into the unit the fleet actually buys: pence per litre. When the renewal offer arrives, the question is not whether the headline rate has fallen. It is whether the effective rate has fallen after the fees are applied to the fleet’s real transaction profile.
The cheapest pump price is a useful starting point. The invoice is the decision document. Auditing it before renewal turns a comparison of slogans into a comparison of costs — and gives the fleet a defensible position when the next contract is drafted.
