Vehicle Tracking Mileage Claims: How to Audit in 2026

Vehicle tracking can help a fleet manager check whether mileage claims match recorded journeys, but only when the vehicle is actually tracked and the organisation has a clear data-use policy. For claims involving employees’ own cars, HMRC’s mileage rules and the evidence required by the employer must be considered separately.

What vehicle tracking can verify

For a tracked fleet vehicle, FleetTracker can provide journey history, route playback and mileage information. These records can help an authorised reviewer check:

• whether a journey appears in the vehicle record;
• the date and route recorded for that journey;
• the distance recorded by the tracking system;
• which driver was recognised where Automatic Driver Recognition (ADR) is configured correctly;
• whether the journey needs clarification before a claim is approved.

Tracking data is evidence of vehicle movement. It does not automatically prove the business purpose of a journey, identify an authorised passenger or explain every diversion. The reviewer still needs the claim form, business reason and any supporting record required by the organisation’s policy.

Check which mileage rule applies

HMRC’s approved mileage allowance payments guidance sets rates employers can use for business travel in an employee’s own vehicle. From 6 April 2026, the approved amount for cars and vans is 55p per mile for the first 10,000 business miles in the tax year and 25p per mile above that. Different rates apply to motorcycles and bicycles.

Those rates do not mean every recorded vehicle mile is claimable. Commuting and private journeys are not automatically business mileage, and an employer still needs a clear process for recording the purpose of the journey.

If the vehicle is company-owned rather than the employee’s own vehicle, different tax and reimbursement questions may apply. Finance teams should confirm the correct treatment with HMRC guidance or their tax adviser.

A practical mileage-audit process

1. Define the evidence required

State what the employee must provide, such as the date, starting point, destination, business purpose and claimed distance. Make the same requirements clear to every claimant.

2. Match the claim to the tracked vehicle

Check the registration and, where ADR is used, the recognised driver. ADR supports driver allocation, but the organisation should still provide a way to correct a missing or incorrectly assigned driver record.

3. Compare the date, route and distance

Use FleetTracker journey history and route playback to review the relevant movement. Small differences can arise from route choice, diversions or the point at which a claim starts and ends. Do not treat a difference as wrongdoing without checking the context.

4. Ask for clarification

If the claim and the vehicle record do not align, ask the employee to explain the difference. Record the explanation and the final decision.

5. Approve, adjust or reject consistently

Apply the organisation’s written policy. There is no universal percentage tolerance published by Crystal Ball or HMRC for matching a claim to tracking data, so do not invent one.

6. Keep only the records you need

Tracking and mileage information may be personal data. Follow the Information Commissioner’s Office UK GDPR principles for purpose limitation, data minimisation, accuracy, security and retention.

What FleetTracker does and does not do

Crystal Ball’s current FleetTracker page supports live location, journey history, route playback, mileage, vehicle utilisation, ADR and fleet records.

FleetTracker does not:

• decide whether a journey qualifies for tax relief;
• confirm the business purpose without supporting information;
• replace payroll, HR or tax advice;
• provide camera footage or digital vehicle checks;
• guarantee that an ADR record is correct when a fob was not used as intended.

Questions for a fair mileage policy

1. Which vehicles are tracked?
2. Which types of mileage claim can be checked against those records?
3. What information must the claimant provide?
4. Who may access journey data?
5. How can a driver explain or correct a discrepancy?
6. Which HMRC rate applies to the vehicle and tax year?
7. How long will claim and journey evidence be retained?
8. How will the policy be explained to employees?

FAQ

Use journey data as evidence, not accusation

A fair mileage review compares the claim with the tracked journey, asks for context and records the decision. That approach supports consistent control without pretending that location data answers every payroll or tax question.

Request a Demo to see how FleetTracker records journeys, mileage and ADR for tracked fleet vehicles.