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Understanding ATO's Audit Focus on Property CGT Claims

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

The ATO focuses on property CGT claims to ensure compliance with tax laws, scrutinising calculations, cost base accuracy, and exemptions. Investors should ensure records are precise and consult with professionals to avoid common errors.

The Australian Taxation Office (ATO) has a keen eye on property Capital Gains Tax (CGT) claims, given the significant tax implications involved. The ATO's audit focus is primarily on ensuring that taxpayers are accurately reporting their capital gains and correctly applying exemptions and deductions under the Income Tax Assessment Act 1997.

Under the CGT provisions, the ATO scrutinises several key areas. These include the calculation of the cost base, the application of the main residence exemption, and the timing of asset disposal. A common misconception is that any property can benefit from the main residence exemption; however, the rules are specific and require careful documentation to support such claims.

To see how this plays out, consider a practical example. Imagine a 3-bedroom house in Melbourne purchased for $800,000 in 2015 and sold in 2023 for $1,200,000. If the property was not used as the owner's main residence for part of the ownership period, calculating the CGT can become complex. Assuming a partial main residence exemption applies, the investor might declare a capital gain of $200,000. At a 37% marginal tax rate, this could result in a tax liability of $74,000 if not properly adjusted for eligible exemptions and deductions.

In our experience reviewing thousands of properties across Australia, we often see investors overlooking the importance of maintaining detailed records of property improvements and associated costs. Many fail to adjust their cost base, leading to higher than necessary CGT liabilities. Additionally, confusion around the main residence exemption and its applicability to investment properties is common, frequently resulting in incorrect claims.

The answer can differ depending on your situation. For properties acquired before 20 September 1985, CGT does not apply, but improvements made after this date can still be subject to CGT. For those in Self-Managed Super Funds (SMSFs), different rules apply, particularly around the timing of asset disposal and fund compliance. Joint ownership requires careful consideration of how gains are split and reported, potentially differing from individual ownership scenarios.

When it comes to property CGT claims, professional advice is invaluable. A Chartered Quantity Surveyor can help ensure that your cost bases are accurately calculated, while an accountant can provide guidance on how to apply exemptions and calculate your CGT liability effectively.

  • Review your property records to ensure they are complete and accurate.
  • Consult with a Chartered Quantity Surveyor to verify cost base calculations.
  • Discuss your CGT strategy with your accountant, particularly regarding exemptions.
  • Stay informed about any legislative changes that may affect your claims.
  • Consider seeking a private ruling from the ATO if your situation is complex.
  • Keep abreast of ATO audit focus areas to ensure compliance with tax obligations.
  • Frequently Asked Questions

    What records should I keep for CGT purposes?

    You should keep detailed records of purchase and sale contracts, improvement costs, and any other expenses that can be included in your cost base. These records help ensure accurate CGT calculations.

    How does the main residence exemption work?

    The main residence exemption allows you to disregard capital gains on your home, provided it was your primary residence. If the property was rented out or used for business, the exemption may not fully apply.

    Does CGT apply to inherited properties?

    CGT may apply to inherited properties if you sell them. The cost base is generally the market value at the time of inheritance unless the deceased acquired it before 20 September 1985.

    Are there different CGT rules for properties in different states?

    While CGT is a federal tax, state-specific regulations can affect property transactions, such as stamp duty. It's important to understand both federal and state requirements.

    How do I report CGT on my tax return?

    You report CGT in your tax return using the Capital Gains section. This includes detailing your cost base, sale proceeds, and any applicable exemptions or discounts.

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