Guide to Grey Fleets in Australia

A grey fleet is when employees use their own vehicles for work. It’s more common in Australia than most businesses realise — and if your people ever drive between sites, visit customers, or run a work errand in their own car, you’re already managing one, whether you call it that or not.

The good news: running a grey fleet well isn’t complicated. A few clear policies, consistent mileage tracking, and the right compliance checks will cover most of what Australian employers are expected to do.

This guide walks you through what a grey fleet actually is, what falls to you as the employer, and the practical steps to keep it manageable as your team grows.

What is a grey fleet?

A grey fleet is any vehicle used for work that isn’t owned, leased, or directly provided by the business.

In most cases, that means employees driving their own cars. But the definition also covers:

• Vehicles funded through a car allowance
• Novated leases and salary-packaged vehicles
• Hire cars and short-term rentals used for work
• Vehicles used by contractors, freelancers or volunteers carrying out work on behalf of the business
• A client’s vehicle driven by a worker — often called a “double grey fleet,” and common in community care and healthcare settings.

It's a grey fleet whether or not the driver is reimbursed, and it isn’t limited to cars. Utes, vans, 4WDs, motorcycles, scooters — even bicycles, in some contexts — can all fall under the grey fleet.

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Who’s a grey fleet driver?

A grey fleet driver is anyone using a non-company vehicle for work-related travel. In practice, that’s a broad group:

• Employees receiving a car allowance instead of a company car
• Staff using their own car for occasional trips (customer visits, training, site inspections, errands)
• Sales reps, consultants and field technicians visiting customers or sites
• Community care and healthcare workers travelling between clients
• Apprentices driving to and from worksites
• Contractors, freelancers and gig workers driving as part of their role

Most of these drivers won’t think of themselves as “fleet drivers” at all — which is part of why a grey fleet can sit invisible inside an organisation for years.

Grey fleet vs company cars vs novated leases

However, ownership isn’t the whole story. SafeWork Australia’s national guidance on vehicles as a workplace includes worker-owned and salary-packaged vehicles when they’re used in the course of work. That’s why novated lease vehicles often need to fall under grey fleet safety processes, even though their tax treatment differs.

Why a grey fleet is becoming the norm in Australia

A few things have quietly made a grey fleet the default for many Australian businesses.

Workplace flexibility. Hybrid work and less predictable schedules mean employees often prefer to use their own vehicle rather than be tied to a company car. For employers, that flexibility removes the cost of assets sitting idle when teams change shape.

Cost control. Relying on employee-owned vehicles frees up capital and cuts spending on servicing, maintenance, insurance, and fleet admin. Reimbursement through ATO-approved methods — the cents-per-kilometre method (for up to 5,000 business km per car per income year) or the logbook method (a 12-week continuous record valid for up to five years) — keeps the arrangement straightforward.

Tax and fringe benefits. Fringe Benefits Tax treatment often makes a traditional company car a less attractive perk, nudging more employees toward mileage reimbursement and their own vehicle.

Driving patterns. Business travel has become more fragmented since the pandemic. More online meetings, fewer long trips, and less predictable schedules make a full company fleet harder to justify.

Mileage data from Driversnote bears this out: employees are driving on more days of the year, but journeys are shorter and less predictable — which is exactly the shape of work that suits a grey fleet, and exactly the shape that manual logs struggle to capture accurately.

What are employers responsible for?

Under Australian work health and safety law, a vehicle used for work is considered a workplace. That’s set out in the model Work Health and Safety Act 2011 — adopted by the Commonwealth and most states and territories. Victoria operates under the OHS Act 2004 and Western Australia under its own WHS Act 2020, but the principles are closely aligned.

The practical consequence: your duty of care as an employer extends to work-related driving in the same way it applies to any other task. It extends to worker-owned vehicles when they’re being used in the course of work — not to an employee’s ordinary home-to-work commute, but to any driving that’s part of the job (a client visit, a site trip, a supply run).

Day to day, that means making sure:

• Drivers hold a current, valid licence for the vehicle class they’re driving
• Vehicles are registered and roadworthy, including state-based checks where they apply (for example, QLD safety certificates and NSW pink slips)
• Insurance covers business use — standard private-use policies often don’t
• Work-related travel is recorded consistently through accurate mileage tracking
• There’s a clear grey fleet policy that employees know about

Alongside this, there’s an ATO side. This is where your business (most likely) reimburses employees for work-related kilometres. Accurate mileage records are what unlock compliant reimbursement under either the cents-per-kilometre method or the logbook method. 

For both, the quality of the underlying data matters more than the method itself — reconstructed logs at tax time create friction for finance and risk for the driver.

What good grey fleet management looks like

Good grey fleet management isn’t about building a fleet program from scratch. It’s about visibility and consistency — knowing who’s driving for work and whether the basics are covered.

A workable setup usually includes:

The National Road Safety Partnership Program (NRSPP) framework goes further and recommends controls around journey planning, driver education, vehicle suitability, and ongoing review.

The practical takeaway: the biggest risk isn’t usually one missing document — it’s the absence of a repeatable system.

Who actually manages a grey fleet?

Because a grey fleet isn’t a traditional fleet, internal ownership can be unclear.

When there are no (or just a few) company-owned vehicles, you might not have a dedicated fleet manager or fleet management software in place. 

As a result, grey fleet responsibility tends to spread across teams: finance runs reimbursements, HR handles policy, operations knows who’s driving, and if you have internal WHS officers, they might own the risk side.

But you don’t necessarily need a new department or a heavy admin setup. What you do need is clear ownership of:

• A written policy and simple guidance for employees on mileage tracking, insurance, and safe driving practices
• ATO-compliant reimbursement processes
• Regular verification of licence, registration, insurance, and — where relevant — safety inspections
• A single source of truth for business mileage

Whether that ownership sits with finance, HR, operations, a nominated fleet lead, or a team admin, what makes it stick is the combination of clear process and the right tools. 

As a grey fleet grows past 10, 25, and 50 drivers, informal habits start to break down — documentation becomes inconsistent, reimbursement disputes increase, and the audit trail thins. The earlier you put structure in place, the easier it is to scale in the next stage.

How confident are you in your grey fleet setup?

A quick gut check for fleet managers, CFOs, bookkeepers, HR leads and team admins:

• Do you know which employees drive their own car for work?
• Are those vehicles insured for business use?
• Is business mileage tracked consistently — or reconstructed at tax time?
• Do you have a written grey fleet policy?
• Do licence, registration, and insurance checks happen on a schedule?

If the answer to any of these is “not really,” that’s normal — and it’s the starting point.

Most of the time, the next step isn’t adding more complexity. It’s replacing informal habits with a repeatable process, documenting expectations, and standardising how mileage gets captured.

Also read: Risk assessment - a practical guide for Australian employers