What is a grey fleet?

A grey fleet is the set of privately owned vehicles that employees drive on business journeys. HSE defines it as vehicles owned and driven by workers for business, including cars provided under cash allowance schemes, and its driving for work guidance applies to them.

That means the business should check the driver’s licence and make sure each vehicle is safe, serviced, MOT’d and insured for the way it is used.

Many businesses have a grey fleet without calling it that. If a manager drives to a supplier, a carer uses their own car between visits or a salesperson takes a car allowance instead of a company car, those journeys are part of it.

Who Counts As A Grey Fleet Driver?

Anyone who uses a vehicle they own or provide themselves for work purposes is a grey fleet driver. The test is the journey, not the job title.

Common examples

• Staff taking a car allowance or cash alternative instead of a company car
• Domiciliary carers travelling between clients’ homes
• Estate agents driving to valuations and viewings
• Engineers, surveyors and trades staff using their own vans or cars to reach jobs
• Office staff driving to meetings, training or another branch
• Casual workers driving on the organisation’s behalf

Commuting is different

HSE says commuting is not generally driving for work. The exception HSE gives is a journey that starts from home and goes to a work location that is not the employee’s normal place of work, such as a client, a site or a temporary workplace.

Travel between locations during the day is generally a business journey too.

What Are An Employer’s Duties For Grey Fleet?

Employers must manage the health and safety risks to workers who drive on the road for work, and HSE says that duty covers grey fleet as well as company vehicles. Its approach looks at three things: a safe journey, a safe driver and a safe vehicle.

The safety duty

Employers must manage the health and safety risks to workers who drive or ride on the road as part of their work, under general health and safety law. HSE’s guidance for employers says it applies to grey fleet as well as company vehicles.

The scale of the issue

DfT estimates that 445 people were killed in 2025 in reported road collisions in Great Britain involving someone driving for work, 29% of all road deaths. DfT notes these figures are likely to be underestimates, because journey purpose is often unknown.

Who enforces it

HSE generally leaves enforcement of road traffic law to the police and DVSA, and it tends to get involved where serious management failures contributed. In the most serious cases, management failures can lead to corporate manslaughter charges.

This guide is general information, not legal advice.

Watch out: Paying a mileage allowance does not transfer the safety responsibility to the employee. The business still needs to know the car and driver are fit for the journey.

How Is A Grey Fleet Vehicle Insured?

A grey fleet car is normally insured on the employee’s own policy, not the company’s fleet policy, and that policy usually needs business use added. This is where many businesses have a blind spot.

Business use on personal policies

Personal car insurance is usually sold for social, domestic and pleasure use, often with commuting added.

Driving for work beyond commuting usually needs business use added to the policy.

If the car is used for work without it, the insurer may refuse or reduce a claim, and the driver could be driving without valid insurance for that journey.

Points to check with employees:

• The certificate of motor insurance lists business use, not just social, domestic and pleasure plus commuting
• Business use applies to the employee as the driver, not only to the policyholder, if the car is in a partner’s name
• The cover level is appropriate and the policy is in date
• Any passengers, tools or equipment carried fit within the policy terms

For more on how classes of use work, see our guide to vehicle class of use.

Does the fleet policy help?

Usually not. A fleet policy normally covers vehicles the business owns, leases or hires and has declared to the insurer.

Some insurers may offer an extension for employees’ occasional business use, but it is not standard.

Ask a broker what is available and what it would and would not cover.

What Grey Fleet Checks Should Employers Make?

Check the driving licence, an insurance certificate showing business use, the vehicle’s tax and MOT, its roadworthiness and the driver’s fitness to drive. Keep the checks simple enough that they actually happen.

What to collect and why

Check	Why it matters	Where it comes from
Driving licence	Confirms entitlement, points and any disqualification	DVLA check code or checking service
Business use insurance	The driver’s policy must cover work journeys	Certificate of motor insurance
Vehicle tax	The vehicle must be taxed to use on the road	GOV.UK: Check if a vehicle is taxed
MOT	Vehicles over the MOT age must have a current certificate	GOV.UK: Check the MOT history of a vehicle
Roadworthiness	HSE says grey fleet vehicles should be safe and serviced	Driver declaration, service records
Fitness to drive	Eyesight, medical conditions, fatigue	Driver declaration, return-to-work notes

Licence checks and consent

For licences, our guide to driving licence checks explains the DVLA check code, which is valid for 21 days and can be used once. Ask for the employee’s consent and explain what you will check.

A renewal rhythm

Insurance and MOT certificates expire, so record the expiry dates and ask for the new documents before they lapse. A grey fleet check done once at recruitment tells you little a year later.

A starter grey fleet checklist

• A written rule that no one uses their own vehicle for work until checks are complete
• A signed driver declaration covering licence, insurance, MOT, servicing and health
• A copy of the insurance certificate showing business use
• A licence check at the start and on a set schedule afterwards
• A record of expiry dates, with reminders
• A way to report defects, incidents and new points
• Guidance on journey planning, breaks and phone use

What Happens When Something Goes Wrong In An Employee’s Car?

Incidents in grey fleet vehicles run through the employee’s own insurance rather than the company’s fleet policy, so staff are often unsure who to call. Set the process out before it happens.

Damage and injury claims

The employee reports the incident to their own insurer, because it is their policy that covers the car. They should also tell your business straight away, so you can record it, support them and review whether the journey, schedule or vehicle played a part.

Speeding and parking notices

Notices go to the registered keeper, who is usually the employee rather than the business. Ask staff to tell you about any notice received during a work journey.

A pattern of notices on business trips can point to unrealistic schedules.

Breakdowns

Personal breakdown cover may not include recovery from every location or onward travel.

Agree in advance whether the business will pay for a taxi or hire car to finish the journey.

Time off the road

If the car is off the road after a claim, decide whether the employee can use a pool car or hire vehicle. That hire vehicle then needs its own insurance arrangements for business use.

Recording grey fleet incidents alongside company vehicle incidents gives you one view of work-related road risk, which is what HSE’s approach expects.

How Do Mileage Allowances And Costs Work?

Businesses usually reimburse grey fleet drivers per business mile, and HMRC publishes approved mileage allowance payment rates that set how much can be paid tax-free. The payment is meant to cover fuel, wear and insurance.

Approved mileage rates

HMRC publishes approved mileage allowance payment rates, which set how much can be paid tax-free. Check the current rates on GOV.UK rather than relying on figures from older documents.

What the payment covers

Mileage payments are meant to cover the cost of running the vehicle, including fuel, wear and insurance.

Some businesses find that adding business use is a cost employees resent, so be clear about expectations at the start.

The hidden costs

Grey fleet can look cheap because the business does not buy or insure the vehicles. The hidden costs are admin time spent chasing documents, variable vehicle standards and less control when something goes wrong.

When Should You Move To Pool Cars Or Fleet Vehicles?

There is no mileage threshold that forces a change, so the trigger is practical: business mileage you cannot easily check, records that are always out of date, or work that needs tools, stock or clients carried. Pool cars, short-term hire and company vehicles each give more control at a different cost.

Signs it is worth reviewing

• Business mileage in private cars is high or growing
• You struggle to confirm insurance, MOT and servicing for every driver
• The work involves carrying tools, stock, samples or clients
• Staff turnover means the checks are always out of date
• You want minimum safety standards, such as vehicle age or safety equipment
• Your branding or client contracts expect company vehicles

The options on a scale

Pool cars suit occasional trips from one base. Short-term hire works for irregular longer journeys.

Company cars or vans on a fleet policy give the most control over vehicle standards and insurance. The car fleet insurance page covers pool and company cars, and how many vehicles you need for fleet insurance explains how insurers view small fleets.

What Should You Do About Your Own Grey Fleet?

Start by listing everyone who has claimed business mileage in the past year, because that list is your grey fleet. Then put a light, repeatable process around it and compare the cost against pool or fleet vehicles.

Find your grey fleet

Pull expense claims for business mileage from the past year and list everyone who has claimed. That list is your grey fleet, whether or not you have called it that.

Put a process around it

Use driver declarations, licence checks, insurance certificates showing business use, and expiry reminders. Write it into your driving for work policy so it applies consistently.

Compare the numbers

If a handful of people drive a lot of business miles in their own cars, compare the cost and control of pool or fleet vehicles.

If you decide to bring vehicles in-house, a broker can explain how a fleet insurance policy would handle them and whether any cover is available for the grey fleet journeys that remain.

Sources

• HSE: Driving and riding safely for work (employers)
• HSE: Maintain vehicles
• HSE: The law on driving for work
• DfT: Reported road casualties Great Britain involving driving for work
• GOV.UK: Vehicle insurance
• GOV.UK: View or share your driving licence information
• GOV.UK: Check if a vehicle is taxed
• GOV.UK: Check the MOT history of a vehicle
• GOV.UK: Expenses and benefits, business travel mileage (rules for tax)

Updates

• 17 September 2026 : last reviewed
• 17 September 2026 : Legal and regulatory points checked against official sources

General information about UK fleet insurance, not advice. How we write and check our content