When Do You Need a Vehicle Logbook?
If you claim work-related car expenses using the logbook method, keeping an accurate and up-to-date logbook is essential. Many taxpayers assume a logbook automatically lasts five years but that’s not always the case.
Changes in your work, travel patterns, or vehicle can mean it’s time to complete a new 12-week logbook sooner than expected.
Here’s what you need to know.
How long does a vehicle logbook last?
Under guidance from the Australian Taxation Office (ATO), a valid logbook can generally be used for up to five years. During that period, the logbook establishes your work-related percentage of vehicle use, which is then applied to your total car expenses when calculating your deduction.
However, that five-year period only applies if your work-related driving patterns remain substantially the same. If your circumstances change, you may need to complete a new 12-week logbook earlier.
When you need to start a new logbook.
A new logbook should be kept if your current one no longer accurately represents how you use your vehicle for work. Common situations where this happens include:
- Changing jobs. If you move to a different role or employer and your driving habits change.
- Moving house or workplace. A new home or work location can significantly alter your work travel patterns.
- Changes to work duties. For example, if your role now requires more (or less) travel than before.
If these changes affect the way you use your car for work, your existing logbook may no longer be valid.
New car, same logbook (maybe).
If you purchase a new vehicle, you may still be able to rely on the logbook from your previous car, but there are conditions. You must make a written nomination before lodging your tax return stating:
- You are replacing your original vehicle with a new one.
- The date the new car replaces the old one.
This allows you to apply the same business-use percentage to the new vehicle without completing another 12-week logbook.
Records you need to keep.
When using the logbook method, it’s not just the logbook itself that matters. The ATO requires you to keep records for all car expenses, including:
- Odometer readings at the start and end of the financial year.
- Purchase documents or lease agreements.
- Fuel or charging costs.
- Registration and insurance.
- Servicing, repairs and tyres.
These records support your claim and ensure your deduction can be substantiated if required.
One logbook per car.
If you use more than one vehicle for work, each car must have its own logbook, and the logbook periods should cover the same timeframe. This helps ensure your work-use percentage is calculated correctly for each vehicle.
A note on employer-provided vehicles.
If your employer provides you with a car, or you salary-sacrifice a vehicle through a novated lease, you generally cannot claim car expenses using either the logbook or cents-per-kilometre method. This is because the vehicle is not considered to be owned or leased by you personally for tax purposes.
Instead of claiming deductions personally, the tax treatment typically happens through Fringe Benefits Tax (FBT) and your salary package. Because these arrangements can vary significantly, it’s worth getting advice to make sure your vehicle setup is tax-effective and compliant.
Need help with car expense claims?
Keeping proper records and understanding when to update your logbook can make a significant difference at tax time. Claiming the right amount (with the documentation to support it) helps avoid problems later.
If you’re unsure whether your current logbook is still valid, it may be worth reviewing your circumstances before lodging your next return.
The team at Ascent Accountants can help you ensure your car expense claims are accurate, compliant, and working in your favour. Talk to us today.
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