Car Logbook Method Australia: When to Update and What Records You Need
Many taxpayers assume that once they’ve completed a car logbook, it remains valid for five years without review.
While this is partially true, relying on an outdated logbook can lead to incorrect claims, meaning you could be claiming more or less than you’re entitled to.
When Do You Need a New Logbook?
Although a logbook can be valid for up to five years, you must start a new one if your circumstances change and your work-related travel patterns are no longer accurate.
You should create a new logbook if you:
- Change jobs
- Move home or relocate your workplace
- Experience changes in your work-related driving patterns (e.g. new role or responsibilities)
Using an outdated logbook that no longer reflects your actual usage may result in incorrect tax claims and potential ATO scrutiny.
Using the Logbook Method for Multiple Cars
If you are claiming work-related car expenses for more than one vehicle, you must keep a separate logbook for each car.
For consistency and compliance, ensure that:
- Each logbook covers the same time period
- Records are maintained accurately for each vehicle
What Happens If You Purchase a New Car?
If you purchase a new car during the income year and want to rely on your existing logbook, you must:
- Make a written nomination before lodging your tax return
- State that the new vehicle replaces the old one
- Specify the effective date of the change
Without this step, your previous logbook cannot be applied to the new vehicle.
Company Cars and Novated Leases
If your employer provides a car, or you use a novated lease through salary sacrificing, you generally cannot claim car expenses using:
- The logbook method
- The cents per kilometre method
This is because you do not own the vehicle.
What Records Do You Need to Keep?
To claim car expenses using the logbook method, you must maintain detailed records, including:
- Odometer readings (start and end of the income year)
- Purchase documents or lease agreements
- Decline in value (depreciation) calculations
- Fuel and oil receipts or reasonable estimates
- Charging costs for electric vehicles (home and commercial)
- Registration and insurance payments
- Servicing, repairs, and tyre expenses
Accurate record-keeping is essential to substantiate your claim.
Special Rules for Electric and Plug-In Hybrid Vehicles
If you use the ATO’s home charging rate (4.2 cents per kilometre) to estimate electricity costs:
- You cannot also claim commercial charging expenses
For plug-in hybrid vehicles:
- A specific formula must be used to calculate home charging costs
These rules make it especially important to track how and where your vehicle is charged.
Why Reviewing Your Logbook Matters
Changes in your job, location, or driving habits can significantly impact your claim.
Reviewing your logbook regularly ensures:
- Your claims remain accurate
- You maximise legitimate deductions
- You reduce the risk of ATO audits or adjustments
Get Professional Advice
Car expense claims can become complex, particularly when multiple vehicles, new purchases, or electric vehicles are involved.
If your circumstances have changed, consider speaking with a tax professional to ensure your logbook and records are up to date and that you’re claiming correctly.