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What is the ATO Position on Mixed Personal and Rental Use?

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

The ATO requires that expenses related to a property used both personally and for rental must be apportioned based on actual usage. Only the portion related to rental use is deductible. This ensures compliance with regulations under Division 40 and 43 of ITAA 1997.

When owning a property used for both personal and rental purposes, the ATO mandates that expenses must be apportioned according to the property's usage. This means that only the expenses directly related to the rental portion are tax-deductible. The ATO's position ensures that investors only claim deductions for the time when the property is genuinely available for rent.

Under Division 40 and 43 of ITAA 1997, investors must separate the costs incurred during personal use from those incurred for rental purposes. This applies to both plant and equipment (Division 40) and capital works (Division 43). A common misconception is that all expenses can be claimed if the property is rented for part of the year, which is incorrect. Only the portion of expenses corresponding to the rental period is deductible.

To see how this plays out, consider a scenario where you own a holiday home in Noosa, which you use personally for four months and rent out for eight months each year. If your annual expenses, including mortgage interest and maintenance, amount to $20,000, only the expenses for the eight months of rental use, which equates to $13,333, can be claimed as deductions. Assuming a 37% marginal tax rate, this results in a tax saving of $4,933.

In our experience reviewing thousands of properties across Australia, we find that many investors overlook the importance of detailed record-keeping for mixed-use properties. This oversight often results in incorrect apportionment of expenses, leading to potential ATO audits. Additionally, investors frequently miss claiming depreciation on plant and equipment during the rental period, which can significantly enhance tax savings.

The answer can differ depending on your situation. If you acquired a second-hand residential property after 9 May 2017, the rules for claiming Division 40 depreciation on previously used plant and equipment change. For properties held within a Self-Managed Super Fund (SMSF), different tax implications may apply. Properties used for business purposes alongside personal use, such as a home office setup, require careful consideration of expense apportionment. Additionally, properties rented for only part of the year or those with shared ownership need specific attention to detail.

Given the complexities involved, seeking professional advice is crucial. A Chartered Quantity Surveyor can provide precise depreciation schedules, while an accountant can ensure accurate apportionment of expenses, optimising your tax position.

  • Keep detailed records of personal vs rental use, including dates and expenses.
  • Engage a Chartered Quantity Surveyor to prepare a tax depreciation schedule.
  • Consult with an accountant to accurately apportion expenses.
  • Review and update your property usage annually to reflect any changes.
  • Ensure compliance with ATO guidelines to avoid penalties.
  • Consider the impact of any renovations or improvements on your tax position.
  • Frequently Asked Questions

    How do I calculate the apportionment of expenses?

    Calculate the proportion of time the property is rented versus personal use. Only claim expenses for the rental period, ensuring accurate record-keeping.

    Can I claim depreciation on a mixed-use property?

    Yes, but only for the period the property is rented. A Chartered Quantity Surveyor can provide a detailed depreciation schedule.

    What if I make improvements to the property?

    Improvements may alter depreciation claims. Ensure any capital works are documented and apportioned correctly for rental use.

    How does mixed-use affect my tax return?

    On your tax return, only include income and expenses related to the rental period. Your accountant can help ensure accurate reporting.

    Are there state-specific rules for mixed-use properties?

    While ATO guidelines are federal, some state taxes or regulations may apply. Consult with a local property tax expert.

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    Written by Koste Team · Koste Chartered Quantity Surveyors · AIQS Member · RICS Member · TPB Registered · 1300 669 400 · info@koste.ai