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How Does CGT Work for Commercial Property in Australia?

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

Capital Gains Tax (CGT) on commercial property in Australia applies to the profit made from selling the property. The gain is calculated by subtracting the property's cost base from its sale price. The CGT discount for individuals and trusts is 50% if held for over 12 months, while companies receive no discount. Specific rules apply to improvements and costs incurred during ownership.

When you sell a commercial property in Australia, Capital Gains Tax (CGT) comes into play, impacting the profit you make from the sale. The gain is essentially the difference between the sale price and the cost base of the property, which includes the purchase price plus any costs incurred in acquiring, holding, and selling the asset.

Under Division 104 of ITAA 1997, a capital gain or loss is realised when a CGT event occurs, such as the sale of a property. For commercial properties, the cost base can include purchase costs, holding costs, and improvement costs. It's crucial to remember that companies do not receive a CGT discount, whereas individuals and trusts can claim a 50% discount if the property is held for more than 12 months.

A common misconception is that all expenses related to the property can be deducted from the gain. However, only those that directly contribute to the cost base, such as legal fees, stamp duty, and certain improvement costs, are eligible.

Take a practical example: Imagine you own a commercial office space in Melbourne, purchased for $800,000. Over the years, you've incurred $50,000 in stamp duty, legal fees, and other purchasing costs. You also spent $100,000 on capital improvements. After five years, you sell the property for $1.2 million. Your total cost base is $950,000. The capital gain is $250,000. If you're an individual, the CGT discount reduces the taxable gain to $125,000, saving you a significant amount in taxes, depending on your marginal tax rate.

In our experience reviewing thousands of properties across Australia, we often see investors overlooking the importance of maintaining detailed records of all costs associated with their property. This oversight can lead to significant tax implications when calculating the CGT.

The answer can differ depending on your situation. For example, if the property was acquired before 20 September 1985, it is exempt from CGT. Properties held by companies do not qualify for the 50% CGT discount, and any capital improvements made after acquisition may also affect the cost base. Additionally, if the property is part of a managed fund or trust, different rules may apply.

Given the complexity of CGT calculations and the potential financial impact, it is advisable to consult with a Chartered Quantity Surveyor and a tax accountant. They can provide tailored advice based on your specific circumstances, ensuring you maximise your investment's tax efficiency.

  • Review your property's cost base, including purchase and improvement costs.
  • Keep detailed records of all expenses related to the property.
  • Consult with a Chartered Quantity Surveyor for an accurate property assessment.
  • Discuss your property sale with a tax accountant to understand your CGT obligations.
  • Consider the timing of your sale to maximise potential CGT discounts.
  • Regularly review your investment strategy to align with current tax legislation.
  • Frequently Asked Questions

    How is the cost base calculated for commercial property?

    The cost base includes the purchase price, acquisition costs like legal fees and stamp duty, and capital improvements. It does not include ongoing running costs like maintenance.

    Are there CGT exemptions for commercial properties?

    Yes, properties acquired before 20 September 1985 are exempt from CGT. Additionally, certain small business concessions may apply under specific conditions.

    How does CGT differ for commercial properties in NSW?

    While the fundamental CGT rules are consistent across Australia, state-specific taxes such as stamp duty can affect the cost base calculation in NSW.

    How do I report CGT on my tax return?

    You must report the capital gain or loss in your tax return for the financial year in which the property was sold. It's advisable to use a tax accountant to ensure accuracy.

    Can I defer CGT on a commercial property sale?

    Deferral options are limited but may be available under specific conditions, such as using small business rollover provisions. Consult with a tax professional for tailored 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