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What is a Grey Fleet?

March 18, 2025
by WEX

The term “grey fleet” has become increasingly prevalent within business transportation and fleet management. But what exactly is a grey fleet, and why should UK businesses pay attention to this concept? Let’s dive into the world of grey fleets, exploring their definition, benefits, risks, and effective management strategies.

What is the meaning of a Grey Fleet?

A grey fleet refers to the use of employees’ personal vehicles for business purposes. This arrangement is common in many organisations across the UK, particularly in small to medium-sized enterprises. Grey fleet drivers are employees who use their own cars, motorcycles, or vans for work-related travel, often receiving mileage reimbursement from their employer.

The prevalence of grey fleets in the UK is significant. While exact figures are challenging to pinpoint, it’s clear that many businesses rely on this model as there are approximately 14 million grey fleet drivers on UK roads .

The Benefits and Risks of Grey Fleets

Grey fleets offer several advantages to businesses:

  • Cost-effectiveness: For low-mileage companies, reimbursing employees for using their own vehicles can be more economical than maintaining a company-owned fleet.
  • Flexibility: Employees can use vehicles they’re comfortable with and maintain them according to their preferences.
  • Reduced administrative burden: Companies can avoid the complexities of managing a full company car programme.

However, grey fleets also come with significant risks:

  • Duty of care challenges: Employers have a legal responsibility to ensure the safety of their employees, even when they’re driving their own vehicles for work purposes.
  • Environmental concerns: Grey fleet vehicles tend to have higher CO2 emissions compared to company cars. Data from the British Vehicle Rental and Leasing Association (BVRLA) indicates that the average grey fleet car produces 19% more CO2 than the average company car.
  • Cost control issues: Some employees may view mileage reimbursement as a potential money-making opportunity, leading to inflated claims.
  • Insurance complications: There’s a risk that employees might not have the correct insurance coverage for business use of their personal vehicles.

The Cost of Grey Fleet Management

Managing a grey fleet can be more expensive than many businesses initially anticipate. While it may seem cost-effective on the surface, hidden expenses can accumulate quickly. These costs can include:

  • Mileage reimbursement: The UK government’s Approved Mileage Allowance Payments (AMAPs) set the standard rates, but these can add up significantly for high-mileage employees.
  • Administrative costs: Time spent verifying mileage claims, ensuring compliance, and managing documentation.
  • Potential legal costs: In case of accidents or non-compliance with duty of care obligations.
  • Environmental costs: Higher emissions from grey fleet vehicles can lead to increased carbon footprint and potential future penalties as environmental regulations tighten.

According to Fleet News, businesses with relatively low travel requirements benefit from grey fleets due to the HMRC’s AMAPs rate for reimbursing employees with 45p per mile for the first 10,000 business miles in the tax year. While this can be cheaper than operating a small vehicle fleet, if the grey fleet vehicles cover more than 10,000 miles per annum, this can lead to substantial costs.

Effective Grey Fleet Management Strategies

To mitigate risks and optimise costs associated with grey fleets, businesses should consider implementing the following strategies:

  • Develop a comprehensive grey fleet policy: Clearly outline rules, responsibilities, and expectations for both the company and grey fleet drivers.
  • Regular vehicle checks: Implement a system for verifying the roadworthiness of employees’ vehicles, including MOT, tax, and insurance checks.
  • Mileage tracking and verification: Use digital tools to accurately track and verify business mileage claims.
  • Driver training: Provide regular safety training and updates on company policies to grey fleet drivers.
  • Consider alternatives: For high-mileage employees, it may be more cost-effective to provide company cars or use car-sharing services.
  • Environmental considerations: Encourage the use of low-emission vehicles and consider incentives for employees who choose greener options.

Implementing these strategies can help businesses improve their grey fleet management, ensuring compliance with legal obligations while controlling costs and reducing environmental impact.

Employers have a legal duty of care to ensure the health and safety of their employees, including when they’re using personal vehicles for work purposes. This responsibility is enshrined in various UK laws, including the Health and Safety at Work etc. Act 1974 and the Management of Health and Safety at Work Regulations 1999.

Key legal obligations for employers with grey fleets include:

  • Ensuring vehicles are safe and roadworthy
  • Verifying that drivers have valid licenses and appropriate insurance
  • Conducting regular risk assessments
  • Providing adequate training and information to drivers

Failure to meet these obligations can result in significant legal and financial consequences for the business.

The Environmental Impact of Grey Fleets

As mentioned earlier, grey fleet vehicles typically have higher emissions compared to company-owned fleets. This discrepancy has important implications for a company’s carbon footprint and environmental responsibilities.

According to the BVRLA report, the average CO2 emissions for grey fleet cars are 131g/km, compared to 111g/km for leased company cars, meaning that that the grey fleet cars are 18% cleaner. This difference highlights the potential for significant environmental improvements by transitioning from grey fleets to more controlled and eco-friendly company car programmes.

The Future of Grey Fleets

As businesses increasingly focus on sustainability and cost-efficiency, the future of grey fleets is likely to involve more stringent management practices and a potential shift towards alternative models. This might include:

  • Greater adoption of electric and hybrid vehicles in grey fleets
  • Increased use of telematics and fleet management software for better oversight
  • More businesses opting for company-owned or leased fleets to ensure better control over emissions and costs
  • Integration of car-sharing and mobility-as-a-service solutions to complement or replace traditional grey fleet arrangements

How WEX Can Help

At WEX, we understand the complexities of managing grey fleets and the challenges businesses face in balancing cost, compliance, and environmental considerations. Our fleet management solutions are designed to help you navigate these challenges effectively.

For businesses looking to transition away from grey fleets or implement more robust management practices, WEX’s comprehensive fleet management platform offers the tools and insights you need to make informed decisions and drive operational efficiency.

Conclusion

In conclusion, while grey fleets can offer flexibility and potential cost savings, they also present significant challenges in terms of management, legal compliance, and environmental impact. Understanding these challenges and implementing effective management strategies will be essential for businesses to use grey fleets effectively. With comprehensive fleet management solutions like those offered by WEX, businesses can navigate the complexities of grey fleets more successfully, ensuring compliance, controlling costs, and moving towards more sustainable transportation models.