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Capital Gains Tax · Koste Knowledge Base

How Does GST Affect CGT on Property Sales?

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

GST generally does not apply to residential property sales, but it can affect commercial properties and development sites. For CGT, GST is excluded from the property's cost base and sale proceeds. Consult Division 75 of the GST Act and Division 104 of ITAA 1997 for specifics.

GST (Goods and Services Tax) and CGT (Capital Gains Tax) are two separate tax systems that can intersect in the sale of certain properties. While GST typically does not apply to the sale of existing residential properties, it can be relevant for commercial properties, new residential developments, and properties used in a business. Understanding their interaction is crucial for accurate tax planning.

When selling a property, GST is generally excluded from the selling price for CGT purposes. This means that if GST is applicable to your sale, it does not increase the capital gain subject to CGT. Under Division 75 of the GST Act, the GST component is excluded from the property's cost base and sale proceeds. However, this exclusion does not mean GST is irrelevant; it must still be paid if applicable, and it can significantly impact cash flow and overall profitability.

A common misconception is that GST always increases the capital gain on a property. In practice, GST is a separate consideration that affects cash flow rather than the capital gain calculation itself. This distinction is particularly important for property developers or investors in commercial real estate, where GST is often applicable.

To see how this plays out, consider a commercial property in Melbourne sold for $1.1 million, including GST of $100,000. The GST-excluded sale price for CGT purposes is $1 million. If the property's cost base was $750,000, the capital gain is $250,000. At a 37% marginal tax rate, this results in a CGT liability of $92,500. The GST paid does not alter this CGT calculation but must be remitted to the ATO.

In our experience reviewing thousands of properties across Australia, one frequent oversight is failing to consider GST when setting sale prices. Investors often focus solely on CGT, overlooking the immediate cash impact of GST liabilities. Another common error is not consulting with a tax professional early in the transaction process, which can lead to unexpected GST obligations and penalties.

The answer can differ depending on your situation. For example, if you're selling a new residential development, GST is generally applicable, but the margin scheme might reduce the GST payable. For properties owned by an SMSF, both GST and CGT considerations can be more complex, requiring specific advice. If you acquired a property before 1 July 2000, GST might not be relevant at all.

Given these complexities, professional advice is crucial. A Chartered Quantity Surveyor can assess the property's depreciation and cost base accurately, while an accountant can navigate the GST and CGT intricacies specific to your situation. Together, they ensure compliance and optimise your tax outcomes.

  • Review your property's GST status with a tax professional.
  • Confirm the property's cost base for accurate CGT calculation.
  • Consider the margin scheme for new developments to reduce GST.
  • Document all costs associated with the property to maximise deductions.
  • Consult with a Chartered Quantity Surveyor for a detailed property assessment.
  • Ensure timely lodgment and payment of any GST obligations.
  • Frequently Asked Questions

    Does GST apply to all property sales?

    No, GST generally applies to commercial properties and new residential developments, not existing residential properties.

    How does the margin scheme affect GST?

    The margin scheme can reduce the GST payable on property sales, but it requires correct application and documentation.

    Can GST affect my CGT liability?

    No, GST is excluded from the cost base and sale proceeds for CGT calculations. It affects cash flow, not the capital gain.

    What if I sell a property in Queensland?

    State location doesn't change GST or CGT rules, but local duties and charges may apply. Consult a local expert.

    How do I report GST and CGT on my tax return?

    GST is reported on your BAS, while CGT is declared in your annual tax return. Ensure accurate records and professional advice.

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