The long-awaited guidance from the ATO on a simple method for determining the home charging cost of electricity for plug-in hybrid vehicles (PHEVs) has been released.

This comes in the form of a draft update to Practical Compliance Guideline PCG 2024/2, which has provided a simple rate for the cost of electricity for fully electric vehicles (EVs) of 4.2 cents per kilometre, able to be used for fringe benefits tax (FBT) and income tax purposes for the last couple of years. This rate for EVs remains unchanged.

At first glance, the option presented for PHEVs is not so simple. Often, simpler alternatives tend to make fairly big assumptions that won’t be realistic in many cases. 

The option presented for PHEVs is first available for the 2024/25 FBT year or income tax year and involves:

  • Keeping odometer records at the beginning and end of each year (with some leniency around this for the start of the 2024/25 year, allowing a reasonable estimate based on other records);
  • Keeping a record of petrol costs;
  • Obtaining a published average petrol rate (price per litre of petrol) for the period, such as from the Australian Institute of Petroleum’s AIP Annual Retail Price Data; and
  • Obtaining the car’s petrol consumption rate from the manufacturer – being the Condition B test cycle fuel economy figure, akin to the vehicle’s consumption rate in standard hybrid driving mode.

This methodology is optional. If you have a smart charger or other technology that tracks the actual amount your car is charging at home, then you can use that information instead, to determine your actual electricity costs. 

The draft PCG also contemplates the option of using smart charger information to determine the percentage of total kilometres charged at home (the step 5 amount).

Outside of the PCG, it might be possible to determine the amount of power used for charging your car and your actual cost of this power. Note that peak and off-peak rates, along with a contribution from solar panels may make determining the actual cost tricky – hence the need for this option from the ATO. 

While the guidance is still in draft form, we suggest it would be appropriate to adopt this methodology where useful in the 2024/25 FBT returns currently being prepared.

Consultation on this draft publication is open until 25 July 2025, and we are happy to receive your comments for inclusion in a submission to the ATO. Read the draft publication here.

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