FBT car benefits are one of the most common and misunderstood areas of Australian employment tax. If your employer provides a car for private use — or you have a salary-packaged vehicle — Fringe Benefits Tax (FBT) applies. Understanding how it is calculated, and which method produces a lower liability, can make a meaningful difference to your costs.
This guide covers both calculation methods, when each one works in your favour, how employee contributions affect FBT, and what records you need to keep.
What is a car fringe benefit?
A car fringe benefit arises when an employer makes a car available to an employee for private use. The key word is “available” — the car does not have to be driven privately for FBT to apply. If it is available for private use, that is enough.
The ATO considers a car to be available for private use if it is:
- garaged at or near the employee’s home
- not on the employer’s premises overnight (unless specific conditions are met)
- capable of private use even if not actually used privately
The benefit is provided by the employer — which includes companies, trusts, and other business structures. Sole traders cannot provide themselves with a car fringe benefit.
When FBT applies to employer-provided cars
FBT applies during the FBT year, which runs from 1 April to 31 March — not the standard income tax year. This is an important distinction when calculating and reporting FBT liabilities.
FBT applies to cars that meet the ATO definition: essentially passenger vehicles designed to carry fewer than nine passengers, or goods vehicles with a payload of less than one tonne. Utes and vans with a payload of one tonne or more are generally not “cars” for FBT purposes, which affects the calculation significantly.
The FBT rate for 2025–26 is 47%, applied to the taxable value of the benefit.
Method 1: Statutory formula method
The statutory formula method calculates FBT based on the base value of the car, regardless of how much the car is actually used.
Taxable value = base value × 20%
The base value is the original purchase price of the car (including GST, dealer delivery, and non-business accessories), less any trade-in. It does not reduce over time — the same base value applies each year the car is held.
The 20% statutory fraction applies regardless of how many kilometres the car is driven. This method is simpler to administer but can result in a higher FBT liability if the car is used heavily for business.
Example: A car with a base value of $60,000 produces a taxable value of $12,000. At the 47% FBT rate, the gross-up factor and rate produce a tax liability that the employer must pay or pass on to the employee.
The statutory formula method requires minimal record-keeping — essentially just the base value and days available.
Method 2: Operating cost method
The operating cost method calculates FBT based on the actual costs of running the car, multiplied by the private-use percentage.
Taxable value = total operating costs × private-use percentage
Total operating costs include:
- fuel and oil
- registration and insurance
- servicing and repairs
- depreciation (at 25% per year on the base value using the diminishing value method)
- interest (at the ATO’s statutory interest rate, applied to the base value)
The private-use percentage is calculated as:
Private km ÷ total km × 100
This is where the logbook comes in. To use the operating cost method, you must keep a valid logbook — at least 12 continuous weeks that is representative of your typical travel. The logbook establishes your business-use percentage. Private-use percentage is simply 100% minus that figure.
The operating cost method tends to produce a lower taxable value when:
- the car is driven predominantly for business
- the car is high in value (where the statutory formula produces a large taxable value)
- actual running costs are low relative to the base value
Which FBT method gives you a lower liability?
There is no universal answer — it depends on the specific car and how it is used.
As a general guide:
- If you drive more than 80% business kilometres, the operating cost method usually produces a lower liability.
- If you drive a high proportion of private kilometres, the statutory formula may actually be lower (since private use increases the taxable value under the operating cost method significantly).
- For high-value cars with low actual running costs, the operating cost method often wins.
The ATO allows you to choose whichever method produces the lower taxable value for each car in each FBT year. You are not locked in once you have used one method.
FBT and employee contributions
An employee can reduce the FBT liability by making employee contributions toward the cost of providing the benefit. These contributions come from after-tax income and reduce the taxable value dollar for dollar.
For example, if the taxable value under the statutory formula is $12,000 and the employee contributes $3,000 from after-tax pay, the taxable value reduces to $9,000.
Salary sacrifice arrangements are different — payments from pre-tax salary are not employee contributions for FBT purposes.
Employee contributions are most relevant when an employer passes on some or all of the FBT cost to the employee through the remuneration structure.
Keeping records for FBT purposes
For the statutory formula method, you need:
- the base value of the car
- the date the car was first provided for private use
- the number of days the car was available in the FBT year
For the operating cost method, you need:
- a valid logbook (12-week minimum)
- odometer records for the start and end of the FBT year
- receipts or invoices for all operating costs
The logbook establishes the business-use percentage that applies to the entire FBT year. If you do not have a valid logbook, you cannot use the operating cost method — the ATO will default to the statutory formula.
Tripbook’s automatic kilometre tracking captures every trip with date, location, distance, and purpose. The export report includes odometer readings and business-use percentage, which is exactly what you need to support the operating cost method. See kilometre tracking: ATO-compliant logbook for how this works in practice.
FBT year and reporting
The FBT year runs from 1 April to 31 March. Employers must lodge an FBT return by 21 May following the end of the FBT year (or later if lodged through a tax agent).
The taxable value of car fringe benefits must also be reported on employees’ payment summaries (income statements) as a reportable fringe benefit amount — but only if the total exceeds $2,000 per year. This amount is used to calculate certain income-tested thresholds such as Medicare levy surcharge and HECS-HELP repayments, even though it is not subject to income tax itself.
Understanding FBT car benefits is critical for employers providing vehicles and for employees in salary packaging arrangements. The choice of method and strength of your records can shift the liability significantly.
Download Tripbook to keep a logbook that supports the operating cost method and lowers your FBT liability.
