Company EV Mileage Claim Controls

An EV mileage claim can look simple: business miles multiplied by a pence-per-mile rate. The control problem sits underneath that calculation. Finance and Payroll need to show which vehicles and journeys were eligible, which rate applied on the journey date, how charging was classified and who approved any exception.

This checklist is for UK employers reimbursing business mileage in fully electric company cars. It is an operating guide, not tax or legal advice.

Start with the boundary

HMRC's Advisory Fuel Rates guidance says the rates apply only to employees using a company car. Employers can use them to reimburse business travel in company cars or to calculate what employees repay for private fuel.

For this checklist, keep the following outside the process:

employee-owned vehicles, which fall under separate business-mileage rules
vans
hybrid company cars, which HMRC treats as petrol or diesel cars for Advisory Fuel Rates
private travel and ordinary commuting
home-charger installation, salary sacrifice and wider benefit-in-kind questions
Do not route these cases through an electric company-car rule simply because the vehicle has a plug. Give them a separate policy and specialist review where needed.

AER is a reference point, not a certification

HMRC reviews Advisory Fuel Rates quarterly, on 1 March, 1 June, 1 September and 1 December. At the publication date of this article, the following advisory electric rates apply to fully electric company cars from 1 June to 31 August 2026:

7 pence per mile for home charging
15 pence per mile for public charging
The word advisory matters. These are not a mandatory tariff and using them does not certify or approve an employer's wider reimbursement process.
HMRC says an employer can use its own rate where its cars are more efficient or the cost of business travel is higher. A rate above the advisory amount needs evidence that the fuel cost per mile is higher; otherwise the excess may need different tax and National Insurance treatment. For mixed home and public charging, HMRC permits mileage to be apportioned according to how much charging occurs at each location, provided the calculation is fair and reasonable.
The evidence file should therefore document the employer's decision, not just copy the latest rate table.

The ten-part claim control

1. Scope record

Keep a controlled list, or a reliable system field, showing that each vehicle is:

a company car available to the employee
fully electric rather than hybrid
covered by the reimbursement policy in force
Record the effective date of any vehicle or policy change. A registration number or internal fleet ID is normally more useful than free-text model names.

2. Journey record

For each claim, retain enough information to explain:

when the travel took place
the business reason for the journey
the business miles claimed
the claimant and vehicle
GOV.UK's expenses and benefits record-keeping guidance says employers must keep the date and details of expenses and benefits, the information used to calculate reported amounts and, for reimbursed travel, when and why the employee travelled. It also says to retain receipts where possible.
Do not treat a total mileage figure with no journey purpose as a complete evidence trail.

3. Charging classification

Record whether the reimbursed mileage is treated as home charged, public charged or mixed.

For a mixed claim, retain the basis for the split. That could be a charging log, an agreed allocation method or another consistent source that makes the apportionment reviewable. Avoid a default percentage that nobody can explain.

4. Rate source and effective date

Keep a versioned rate table containing:

the rate
the charging category
the effective date
the source URL
the date Finance or Payroll checked the source
Rate logic should start from the rate period covering the journey. If the employer uses HMRC's permission to continue a previous rate for up to one month after a change, document that decision and its end date; do not simply use whichever rate is current when the claim is paid.

5. Decision record

State whether the employer uses:

HMRC's advisory electric rates; or
an alternative evidenced rate
Name the policy owner and approver, record the decision date and link to the supporting calculation. This is the point at which Finance should document why the chosen method fits the organisation's charging arrangements.

6. Evidence for an alternative rate

Where an employer pays above the advisory rate, keep the inputs that demonstrate the higher electricity cost per mile. Depending on the method, those inputs may include:

charging invoices or tariffs
the charging location and price per kWh
the vehicle-efficiency assumption and its source
the calculation that converts electricity cost into cost per mile
the period for which the calculation remains valid
the approver and review date
Evidence should support the exact rate paid, not merely show that some public charging was expensive.

7. Calculation and payroll output

The audit trail should connect the approved claim to the amount paid. Keep:

eligible business miles
rate applied
charging split, if relevant
calculated reimbursement
any adjustment or rejected amount
payroll or expenses reference
If an exception changes the tax or National Insurance treatment, record how Payroll handled it. Do not silently overwrite the original claim.

8. Independent approval and exception control

Separate claimant, reviewer and payment roles where practical. For payments made under the expenses-exemption workflow at benchmark or bespoke rates, GOV.UK's expenses exemption guidance says employers must have a checking system and employees cannot check their own expenses. Define the appropriate independent review for the mileage treatment being used.

An exception log should capture the reason, evidence, decision, owner and outcome. Typical triggers include missing journey purpose, an unsupported charging split, an out-of-policy vehicle or a proposed rate above the advisory amount.

9. Retention and access

HMRC's employer record-keeping guidance requires expenses and benefits records to be kept for three years from the end of the tax year to which they relate. HMRC's travel expenses compliance guidance adds that relevant travel records may be paper or electronic and normally need to remain available to HMRC on request.

Mileage and charging records can also contain employee personal data. The ICO's storage limitation guidance says organisations should justify retention by purpose, document standard periods where possible, and delete or anonymise personal data they no longer need.

Set access rights and a retention schedule that meet the tax-record requirement without collecting or keeping unrelated location data “just in case”.

10. Review log and employee instructions

Create a simple review log for the four HMRC review dates. Each entry should show:

whether the published rate changed
the source checked
the decision taken
the systems, policy text and communications updated
the person who completed the review
Give employees short instructions that explain which journeys qualify, what evidence to attach, how to classify charging and where exceptions go. The operational policy and the claim form should say the same thing.

What a review-ready file looks like

A Finance or Payroll reviewer should be able to select one payment and move backwards through a clear chain:

payment record
approved calculation
journey and charging evidence
rate table in force on the journey date
current policy and approval record
They should also be able to move forwards from a rate change to every affected policy, system field and employee communication.
That is the practical test. A spreadsheet containing 7p and 15p is not yet a controlled reimbursement process.

Official sources available by 24 July 2026

HMRC — Advisory Fuel Rates
GOV.UK — Business travel mileage for employees' own vehicles
GOV.UK — Expenses and benefits for employers: record keeping
HMRC — Employer compliance for travel expenses: Chapter 11
GOV.UK — Expenses and benefits for employers: exemptions and dispensations
ICO — Storage limitation

Turn the checklist into an operating pack

The Company EV Reimbursement Pack turns one UK entity's chosen method into policy wording, rate logic, Payroll and expenses controls, an exception framework and employee communication. It covers fully electric company cars only.

Review the Company EV Reimbursement Pack

The 10 Controls Every Company EV Mileage Claim Needs