Grey Fleet Management UK: Employer Duties and Best Practice
Grey fleet — employees using their own vehicles for business journeys — is one of the most overlooked compliance risks in UK businesses. Here's what employers are legally required to do, and how to build a grey fleet management process that protects both drivers and the business.
An estimated 12–14 million business journeys are made in privately-owned vehicles in the UK every year. For many organisations — professional services firms, healthcare providers, field-service businesses, local authorities — grey fleet is the primary way that employees travel to meetings, client sites, and appointments. Yet for the same organisations, grey fleet is also where duty-of-care compliance is most likely to have gaps.
The legal position is clear: an employer's duty of care extends to business journeys made by employees in their own vehicles. The Health and Safety at Work Act 1974, the Management of Health and Safety at Work Regulations 1999, and the Corporate Manslaughter and Corporate Homicide Act 2007 all apply. If an employee has a serious accident during a business journey and the employer cannot demonstrate it took reasonable steps to ensure the driver and vehicle were safe and legal, the consequences can be significant.
What counts as grey fleet?
Grey fleet is any business journey made by an employee in a vehicle they own or lease privately — not a company-owned or company-leased vehicle. It includes:
Commuting to a client site
A sales rep driving their own car to a customer meeting — even if they claim mileage back on expenses.
Field service journeys
A maintenance engineer travelling from home to their first job in their own van.
Healthcare visits
A district nurse or social worker driving their own car to patient or client homes.
Inter-site travel
An employee driving between two company offices in their own vehicle.
Ordinary commuting — travelling from home to a fixed workplace — is not grey fleet and is not the employer's responsibility. The duty of care applies specifically to journeys made in the course of employment duties, including travel to temporary workplaces and between sites.
The four biggest grey fleet compliance risks
Invalid driving licence
If an employee causes an accident without a valid licence, the employer may be liable for uninsured losses and face prosecution under health and safety legislation.
No business use insurance
Standard private car insurance typically excludes business use. If a grey fleet driver is involved in an accident during a business journey with personal-only cover, claims may be void — leaving the employer exposed.
Failed MOT
An employee driving a vehicle without a valid MOT is committing a criminal offence. If an employer knowingly permitted the journey, they may share liability.
Poor vehicle condition
If a driver is injured because their vehicle was in poor condition and the employer failed to carry out reasonable checks, the employer may face prosecution under the Health and Safety at Work Act 1974.
Grey fleet compliance checklist
For each grey fleet driver, you should hold records covering the following areas. The frequency and method columns reflect HSE guidance and accepted industry practice.
| Area | Requirement | Frequency | Method |
|---|---|---|---|
| Driver licence | Valid driving licence for vehicle category | Every 6 months minimum; quarterly for high-mileage or endorsement holders | DVLA online checking service (requires driver consent) |
| MOT certificate | Valid MOT (vehicles over 3 years old) | Check annually at minimum; record expiry date | GOV.UK vehicle MOT check (registration number) |
| Vehicle tax (VED) | Vehicle must be taxed for road use | Check annually or when MOT is renewed | GOV.UK vehicle tax check (registration number) |
| Business use insurance | Insurance policy must include business use cover | Check at onboarding and at each annual renewal | Request insurance certificate showing class of use |
| Vehicle condition | Roadworthy and fit for purpose | Annual declaration from driver; investigate complaints | Driver self-declaration form; maintenance records |
| Eyesight | Driver meets eyesight standard (read a number plate at 20 metres) | Annual self-declaration | Driver declaration form |
HMRC AMAP rates for grey fleet mileage (2024/25)
When employees use their own vehicles for business journeys, they should be reimbursed at the HMRC Approved Mileage Allowance Payment (AMAP) rate — or at a lower rate with the ability to claim Mileage Allowance Relief. Paying above AMAP triggers a tax and National Insurance liability.
| Vehicle type | First 10,000 miles | Above 10,000 miles |
|---|---|---|
| Cars and vans | 45p per mile | 25p per mile |
| Motorcycles | 24p per mile | 24p per mile |
| Bicycles | 20p per mile | 20p per mile |
Source: HMRC — Approved Mileage Allowance Payments, 2024/25. Rates are reviewed periodically by HMRC; always check the current HMRC guidance before setting a reimbursement policy.
Grey fleet and carbon reporting
Grey fleet business mileage is a Scope 3 emission under the GHG Protocol and DEFRA reporting frameworks. While Scope 3 reporting is not mandatory for most UK companies under SECR (Streamlined Energy and Carbon Reporting), it is increasingly requested by enterprise customers and is part of CDP supply chain assessments.
To calculate grey fleet carbon emissions, apply DEFRA per-mile emission factors to total claimed business mileage, broken down by vehicle type. The data source is your mileage expense claim records. Organisations without a central expense management system often find grey fleet is the largest uncaptured source of emissions in their carbon reporting.
For the full picture on fleet carbon reporting, see our fleet carbon reporting guide. For understanding your full duty-of-care obligations across company-owned vehicles, see our DVSA compliance guide.
Managing grey fleet drivers alongside your company fleet
FleetGS supports grey fleet management as part of your wider driver compliance workflow. You can add grey fleet drivers to the system — without vehicle tracking hardware — and use the driver licence checking workflow to maintain a compliance record for each individual. This allows you to manage duty-of-care records for both company-vehicle drivers and grey fleet drivers in one place.
For grey fleet mileage tracking, FleetGS allows drivers to log business journeys via the mobile app, providing a GPS-verified mileage record that replaces manual expense forms — and gives you an auditable trail for HMRC enquiries or insurance claims.
Our driver management module and compliance dashboard are the starting point for any fleet operator looking to bring grey fleet under the same governance as the company vehicle fleet.
Frequently asked questions — grey fleet management
Grey fleet refers to employees using their own privately-owned vehicles to carry out journeys for work purposes. It applies to virtually every UK business that has employees who drive for work — sales representatives, engineers, healthcare workers, field service technicians. The employee owns the vehicle and claims mileage reimbursement, but the employer has a duty of care obligation for that journey under the Health and Safety at Work Act 1974 and the Corporate Manslaughter and Corporate Homicide Act 2007.
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Manage your grey fleet and company fleet in one place
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