Four hours chasing fuel receipts, six mileage claims returned for missing destinations, and a card statement still 86.40 out: that is a plausible month-end for a three-van contractor without a clear vehicle policy. Those are illustrative figures, but the problem is familiar. Switching payment methods will not fix it unless you also decide what evidence drivers must supply.
The fuel card vs mileage reimbursement decision starts with vehicle ownership and who pays the running costs—not the advertised discount per litre.
| Deciding criterion | Fuel card usually wins when… | Mileage reimbursement usually wins when… |
|---|---|---|
| Vehicle and running costs | The business provides the van and pays its operating costs | The worker provides the vehicle and bears its operating costs |
| Administrative workload | You can import vehicle-coded transactions and review exceptions | Trips are occasional and there are few claims to approve |
| Evidence needed | You need purchase, merchant, volume, and payment records | You need a record of business journeys and distance |
| Spending control | You need purchase limits and product restrictions before spending happens | You want an approved cost per business kilometre or mile |
| Private travel | You can control and document company-vehicle private use | You want private fuel purchases kept outside the business books |
Neither method proves everything. A fuel purchase does not establish business travel. A mileage claim does not establish how much fuel was bought.
Scenario 1: Three company vans working five days a week
An electrical contractor owns three vans, pays for servicing and insurance, and assigns one van to each crew. Here, fuel cards are the stronger default: the business is buying fuel for assets it already operates.
Paying a broad mileage allowance to these drivers would be a poor substitute if that allowance is intended to compensate someone supplying their own vehicle. It could pay again for costs the business already covers. A locally permitted fuel-only reimbursement arrangement is a separate option, not the same thing as an all-in mileage rate.
Work the numbers without comparing unlike costs
Assume the following illustrative September figures. All amounts are in currency units; the rate of 0.62 per kilometre is a modelling assumption, not an official reimbursement rate. Figures are before any tax recovery and assume all listed travel is business travel.
| Van | Business km | Fuel litres | Average price/litre | Fuel cost | Hypothetical reimbursement at 0.62/km |
|---|---|---|---|---|---|
| V01 | 2,400 | 288 | 2.25 | 648.00 | 1,488.00 |
| V02 | 2,800 | 336 | 2.25 | 756.00 | 1,736.00 |
| V03 | 2,200 | 264 | 2.25 | 594.00 | 1,364.00 |
| Total | 7,400 | 888 | — | 1,998.00 | 4,588.00 |
The tempting conclusion is that cards save 2,590.00. They do not. The reimbursement column assumes workers provide and fund their vehicles; the fuel column leaves most company-vehicle costs out.
Add a monthly company-vehicle budget of:
- Depreciation and financing cost: 1,380.00.
- Insurance and registration: 420.00.
- Maintenance and tyres provision: 650.00.
- Fuel-card fees: 45.00.
The modelled company-fleet cost becomes 1,998 + 1,380 + 420 + 650 + 45 = 4,493.00, only 95.00 below the hypothetical mileage total. That is a planning comparison, not a ledger posting: maintenance provisions need replacing with actuals for reporting, and cash-flow analysis treats vehicle purchases and loan principal differently.
The models also need comparable vehicles, availability, insurance, payload, and equipment. Employees' existing vehicles may not carry ladders or tow the required trailer. Nor does changing reimbursement policy make existing van finance disappear.
Count the administration separately
For this fleet, suppose card administration takes two hours monthly: transaction review, statement matching, and resolving missing documents. Mileage claims might take three hours across all drivers plus one hour of approval. At an illustrative labour cost of 30 per hour, that is 60 versus 120.
Measure those minutes during a trial. Do not count only the bookkeeper's time while ignoring drivers reconstructing journeys on Sunday night.
Set cards up with vehicle IDs, individual driver identification where available, suitable product restrictions, and realistic limits. Check network coverage against actual job locations; a discounted card that requires a detour has a cost too.
A useful purchase sheet looks like this:
| Date | Vehicle | Driver | Merchant | Litres | Amount | Provider reference | Evidence |
|---|---|---|---|---|---|---|---|
| 2026-09-08 | V02 | DR04 | North Quay Fuel | 56.0 | 126.00 | FC-90318 | Receipt link |
| 2026-09-15 | V02 | DR04 | Ridgeway Service | 48.0 | 108.00 | FC-90762 | Receipt link |
These are two purchases within V02's monthly total, not additional expenses. Match the provider export to its statement, account for fees and credits, then match settlement to the bank. The bank payment clears the card balance; it must not create a second fuel expense.
Scan2Sheet can capture supporting receipts into your own Google Sheet, extract expense data with AI, categorize purchases, flag duplicates, and link cloud-stored images from each row. Its multi-page long-receipt capture helps preserve the full document; automatic expense summaries support review, but neither replaces statement reconciliation or driver-added vehicle details.
The clear winning point: once the business supplies the vans and already pays their running costs, use fuel cards for routine refuelling unless fees, acceptance, or local rules make another purchase-payment method better.
Scenario 2: A worker uses their own van for call-outs
A maintenance technician provides their own van, pays its insurance and repairs, and makes six business call-outs monthly. Issuing a fuel card introduces a mixed personal/business purchase stream without compensating clearly for wear, tyres, or vehicle ownership.
Mileage reimbursement wins here, provided the arrangement is appropriate under local employment, insurance, and tax rules. It turns each approved business trip into a calculable amount without requiring the business to inspect the worker's grocery-stop fuel receipts.
Create a journey record, not a monthly distance guess:
| Date | Vehicle | Route | Business purpose | Business km | Rate | Claim |
|---|---|---|---|---|---|---|
| 2026-09-11 | PV07 | Workshop → Cedar Court → workshop | Job 418: replace isolator | 64 | 0.62 | 39.68 |
| 2026-09-18 | PV07 | Workshop → Eastbank depot → workshop | Job 436: pump fault | 92 | 0.62 | 57.04 |
Opening and closing odometer readings can strengthen the record and may be required locally. Keep approval, payment date, and a unique claim ID alongside the journey information.
The approval process should have five steps:
- Confirm eligibility. Record who owns or leases the vehicle, who pays its costs, and whether business use is insured.
- Publish the rate policy. State the effective date, distance unit, covered costs, and any thresholds or vehicle classes.
- Record journeys promptly. Capture destinations and purpose while the driver can still explain them.
- Review exceptions. Check unusual distances, repeated routes, and claims inconsistent with attendance or job records.
- Pay and lock the claim. Preserve the approved version; record later corrections rather than silently editing paid rows.
A receipt for 80.00 of fuel is not the basis for a 96.72 mileage claim. The latter could be 156 approved kilometres × 0.62, regardless of when the tank was filled. Keep receipts for separately reimbursable items, such as parking, under their own expense categories and policy.
Check the relevant revenue authority for permitted methods, substantiation, rate limits, and whether thresholds apply across the year. Check payroll or social-insurance guidance for payment treatment and the employment authority for reimbursement obligations. An official tax rate is not automatically the employment-law minimum or the best commercial rate.
For a self-employed owner, claiming vehicle expenses in their own accounts may follow different rules from reimbursing an employee. For a subcontractor, agree travel charges through the contract and invoice rather than automatically treating them as staff claims.
The clear winning point: when the worker supplies the vehicle and business trips are occasional, mileage usually removes more administration than a fuel card does.
Scenario 3: One company van goes home every weekend
V03's driver takes the company van home and uses it for a private weekend trip. This changes the control problem even if all refuelling occurs at approved merchants.
A fuel card's personal-use problem is that business money can buy fuel used privately. Card limits prevent excessive purchases; they cannot distinguish a customer visit from a family visit after the fuel enters the tank.
Keep a journey or odometer record capable of separating business and private distance under the applicable rules. Do not automatically label home-to-site travel business mileage. Commuting, temporary workplaces, and carrying tools can be treated differently by different authorities.
For illustration, add 200 private kilometres to V03's original 2,200 business kilometres. At the example's consumption of 12 litres per 100 kilometres, those extra kilometres imply 24 litres, or 54.00 at 2.25 per litre.
That 54.00 is a management estimate, not automatically the legally correct recovery or taxable-benefit amount. Tank levels, driving conditions, and purchase timing also prevent exact monthly fuel-use allocation from receipts alone.
Write down the permitted arrangement before private use occurs:
- Private use prohibited, with a practical monitoring process.
- Private use allowed, with an agreed employee contribution where permitted.
- Private use allowed and handled through the applicable benefit-reporting process.
Ask the local revenue authority about company-vehicle and employer-paid private-fuel treatment. Check employment rules before payroll deductions, and confirm insurance coverage. Recovering the apparent fuel cost does not necessarily eliminate every reporting obligation.
Mileage reimbursement creates the opposite risk: the driver buys their own private fuel, but may submit private distance as business distance. A 110-kilometre claim for a job normally requiring 70 kilometres needs an explanation. A supplier collection might justify the difference; a personal detour should be separated.
Approve the business portion against job schedules and route information. Do not insist every genuine trip match the shortest map route: road closures, vehicle restrictions, and collecting materials can legitimately change it.
The useful distinction is purchase control versus journey control. A clean card statement can coexist with undocumented private use; a perfectly calculated mileage claim can contain ineligible journeys.
Scenario 4: Two company vans, one personal vehicle, and a breakdown
Mixed ownership calls for a mixed policy. Put the two company vans on fuel cards and reimburse qualifying journeys in the worker-owned vehicle. The unit of policy is the vehicle and arrangement, not simply the driver's name.
Maintain a vehicle register with ownership, authorized drivers, payment method, effective dates, and private-use rules. If a company van fails and the driver uses a personal vehicle for two days, record the temporary change before approving the claim.
A hired replacement van needs its own treatment: establish who pays the hire, fuel, insurance, and excess-distance charges. Do not automatically pay an all-in mileage rate on top of a business-funded rental.
Set a no-overlap rule for the same vehicle and journey. Where a mileage rate already covers fuel, do not also reimburse that fuel unless a specifically documented arrangement adjusts for it. Record company-paid advances or accidental card purchases so the approver can resolve them before payment, following local requirements.
Change methods without losing the cut-off
Choose a switch date and record odometers, card assignments, and outstanding claims. Disable old card access when drivers leave or vehicles are sold. Preserve the vehicle ID on historical transactions rather than renaming it for the replacement van.
For each close, keep separate control totals:
- Fuel-card control: purchases plus fees, less credits, reconciled to the statement and settlement.
- Mileage control: approved distance multiplied by the applicable rate, reconciled to claims paid and amounts still payable.
Use service dates to identify the reporting period, while retaining statement and payment dates. A purchase on 30 September appearing on an October statement must not vanish between periods. Follow the business's accounting basis when posting it.
Resolve exceptions without inventing evidence
| Failure you find | What to do |
|---|---|
| Fuel receipt dated the day before a job began | Check vehicle assignment and journey records. Advance refuelling can be legitimate; the job date alone neither proves nor disproves it. |
| A 92-litre purchase against a van with a 70-litre tank | Ask about approved containers or equipment fuel; split documented uses. Otherwise flag possible miscoding or misuse for review. |
| Card export and scanned receipt both counted as expenses | Match by provider reference, then merchant, date, and amount. Keep one expense with linked evidence; review duplicate flags before deleting anything. |
| Statement total differs by 86.40 | Reconcile line by line for fees, omitted purchases, credits, and cut-off differences. Keep an unresolved difference visible rather than forcing it into fuel. |
| Mileage jumps after a dashboard replacement | Preserve repair evidence and both odometer readings; document the adjustment instead of overwriting earlier records. |
| A driver enters 120 miles into a kilometre column | Store the original unit and convert explicitly: 120 miles is approximately 193.12 kilometres. Recalculate before approval. |
| A receipt is missing but the card charge exists | Request a merchant copy or check whether the provider supplies acceptable invoice evidence. Keep the purchase recorded and flag the documentation gap separately. |
For VAT/GST or similar transaction taxes, ask the relevant authority which document supports recovery; a payment record, mileage allowance, and valid tax invoice are not interchangeable. Retain approved claims, statements, receipt images, corrections, and supporting journey records for the locally required period, with access restricted to people who need them.
Use Scan2Sheet to collect the fuel receipts in your own Google Sheet, then review them alongside the vehicle register and approved journey records.