While preparing a real estate agent's tax return,we noticed they used their personal vehicle extensively for work.
Between property inspections, appraisals, listings, open homes andclient meetings, the client had genuinely travelled more than 5,000business kilometres during the year.
The issue wasn't whether those additional kilometres were genuine.
They were.
The issue was that the client had been using the centsper kilometre method.
For the 2024–25 income year, the rate was 88cents per kilometre, but the method was limited to a maximum of 5,000business kilometres per car.
That meant the maximum deduction available under that method was:
5,000 km × $0.88 = $4,400
Even though the client had genuinely travelled substantially morethan 5,000 kilometres for business, we couldn't simply claim the additionalkilometres using the cents per kilometre method.
A different approach going forward
Given the client's level of business travel, we suggested that goingforward they consider using the logbook method.
Under the logbook method, there isn't the same 5,000-kilometrecap.
Instead, the client can establish their business-usepercentage andapply that percentage to eligible actual vehicle costs.
Depending on the circumstances, this can include expenses such as:
- fuel;
- registration and insurance;
- servicing and repairs;
- depreciation on the vehicle; and
- the deductible business-use portion of interest on finance used to acquire the vehicle.
We explained that the client would need to keep an appropriate 12-weeklogbook representingtheir normal travel pattern, together with the required odometer and expenserecords.
Once established, a valid logbook can generally be relied upon forup to five years, provided theclient's circumstances haven't changed in a way that requires a new logbook.
Why the method mattered
We weren't trying to find a way around the 5,000-kilometre limit.
For the year being prepared, the client's cents per kilometreclaim was capped despite the additional genuinebusiness travel.
What we identified was an opportunity to improve the position goingforward.
For someone who regularly drives well over 5,000 businesskilometres, particularly where there are significant vehicle running costs,depreciation and finance interest, the logbook method may produce a materiallydifferent deduction.
The actual outcome depends on the client's business-use percentageand eligible costs, which is why the two methods need to be considered based onthe client's circumstances.
The method matters as much as the kilometres
Sometimes a tax return tells us more than what deduction to claimfor the year just finished.
It can tell us what needs to change for the next one.
The client had genuinely travelled more than 5,000 businesskilometres, but the method they were using meant their claim was capped.
Rather than simply processing the same claim and moving on, weexplained the limitation and helped them put the records in place toconsider a more appropriate method going forward.
Forthis client, the immediate claim was capped, but better record-keeping couldsupport consideration of the logbook method in future years.
This case study is based on client circumstances, with certainfacts and financial information generalised or changed to protectconfidentiality. Car expense deductions depend on the taxpayer's circumstances,the nature of the travel, the calculation method used, substantiationrequirements and applicable tax law.
Stay Ahead with Business & Tax Insights
Receive practical business insights, taxation updates and strategic guidance delivered directly to your inbox. Stay informed about legislative changes, emerging opportunities and practical strategies to help you structure, grow and protect your business.

More real-world examples
Explore other situations where a closer look at the numbers, structure or timing helped uncover an opportunity or identify a potential issue.



