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Capital Gains Tax · Koste Knowledge Base

What is a CGT Option Contract?

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

A CGT option contract is a financial arrangement allowing the holder to buy or sell an asset at a predetermined price before a set date. In Australia, these contracts are subject to Capital Gains Tax under the CGT provisions of the ITAA 1997. Proper understanding of these contracts helps in strategic tax planning.

A CGT option contract is a specialised financial agreement granting the holder the right, but not the obligation, to buy or sell an asset at a predetermined price within a specific timeframe. In Australia, these contracts are subject to Capital Gains Tax (CGT) under the Income Tax Assessment Act 1997 (ITAA 1997). Such contracts can be a powerful tool for strategic tax planning, allowing investors to lock in prices and potentially defer tax liabilities.

Under the CGT provisions of the ITAA 1997, an option contract is treated as a separate CGT asset. The grantor of the option (the party selling the right) may face an immediate CGT event when the option is granted. However, the holder (the party buying the right) typically only faces a CGT event if they exercise the option or if the option lapses. A common misconception is that the mere holding of an option triggers a CGT liability, but this is not the case.

To see how this plays out, consider an investor who purchases an option to buy a commercial property in Melbourne for $1.5 million within two years. The option itself costs $50,000. If the investor exercises the option and buys the property, the $50,000 is added to the cost base of the property for CGT purposes. If the investor decides not to exercise the option, the $50,000 is a capital loss, which can offset other capital gains.

In our experience reviewing thousands of properties across Australia, we find that many investors overlook the strategic use of option contracts to manage tax outcomes. For instance, options can be used to defer investment decisions until a more favourable tax period or to secure potential appreciation in property value without committing immediately. Another common oversight is failing to account for the initial cost of the option in the property's cost base, which can affect future CGT calculations.

The answer can differ depending on your situation. For example, if the option is related to a property acquired before 20 September 1985, it may be exempt from CGT. If the option is for a second-hand residential property acquired after 9 May 2017, different rules might apply. Additionally, if the option contract involves a commercial property, the tax implications might differ from residential properties. Lastly, if an option is exercised as part of a business transaction, it might be treated differently than a personal investment.

Given the complexity and potential tax implications, seeking professional advice from a Chartered Quantity Surveyor and an accountant is crucial. They can provide tailored advice based on the specific details of the option contract and the broader investment strategy.

  • Review your current investment strategies to identify opportunities for using CGT option contracts.
  • Consult with your accountant to understand the tax implications of potential option contracts.
  • Engage a Chartered Quantity Surveyor to assist with accurately calculating cost bases and potential capital gains.
  • Consider the timing of exercising options to align with favourable tax periods.
  • Document all option transactions meticulously to support future tax filings.
  • Stay informed about any legislative changes that might affect CGT treatment of option contracts.
  • Frequently Asked Questions

    How does a CGT option contract affect my tax return?

    The impact on your tax return depends on whether the option is exercised, sold, or lapses. Exercising or selling the option may trigger a CGT event, affecting your capital gains calculations.

    Are there state-specific rules for CGT option contracts?

    While CGT is governed federally, certain state-based levies or duties may apply to property transactions. Always check with local authorities.

    Can I use CGT option contracts for residential properties?

    Yes, but be aware of different rules for second-hand residential properties post-9 May 2017, which may affect depreciation claims.

    What happens if I let the option lapse?

    Allowing an option to lapse results in a capital loss equal to the cost of the option, which can offset other capital gains.

    How do I calculate the cost base for an exercised option?

    Include the cost of the option in the property's cost base, alongside the purchase price and any associated acquisition costs.

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