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Main Residence Exemption: How It Affects CGT in Australia

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

The main residence exemption can eliminate or reduce Capital Gains Tax (CGT) on your primary home. If your property was your main residence for the entire ownership period, you may be exempt from CGT upon its sale. Specific rules apply if the property was rented out or used for business. Consult Division 118 of the ITAA 1997 for detailed guidance.

When selling your primary home in Australia, the main residence exemption can significantly impact your Capital Gains Tax (CGT) obligations. This exemption allows you to potentially eliminate or reduce CGT on the sale of your main residence, provided certain conditions are met.

How the Main Residence Exemption Works for CGT

Under Division 118 of the Income Tax Assessment Act 1997, the main residence exemption may exempt you from CGT when you sell your home. To qualify, the property must have been your principal place of residence. The exemption applies fully if the property was your main residence throughout the entire ownership period. Importantly, if you've used the property to produce income, such as renting it out, the exemption might be partial, and CGT may apply to the portion of time it was not your main residence.

How This Works in Practice

Consider a scenario where you purchased a house in Melbourne for $800,000 in 2010 and lived in it as your main residence until 2020. In 2020, you rented it out for two years before selling it for $1,200,000 in 2022. You lived in the house for 10 of the 12 years of ownership. According to the main residence exemption, you are exempt from CGT for the period you lived in the house. However, for the two years it was rented, CGT applies to that portion. Assuming a capital gain of $400,000, the taxable portion would be $66,667 (2/12 of the gain). If you're in the 37% tax bracket, this results in a tax liability of $24,667.

Professional Insight

In our experience, one common misunderstanding is assuming the exemption applies automatically without considering the property's use throughout ownership. Another frequent oversight is not maintaining accurate records of the property's usage, which complicates the calculation of any partial exemptions. We often see investors overlook the impact of the 'six-year rule,' which allows you to treat the property as your main residence for up to six years while rented out, provided you don't nominate another property as your main residence during that time.

When Does the Answer Change?

  • Post-1985 Properties: The main residence exemption only applies to properties acquired after 19 September 1985, the date when CGT was introduced.
  • Partial Year Ownership: If you only owned the property for part of a year, the exemption might be prorated.
  • Foreign Residents: Since 2019, foreign residents are not eligible for the main residence exemption.
  • Inherited Properties: Special rules apply if you inherit the property and it was the deceased's main residence.
  • When Should You Seek Professional Advice?

    Given the complexities of CGT and the main residence exemption, it's wise to consult with both a Chartered Quantity Surveyor and an accountant. They can help determine the correct portion of the exemption applicable, especially if the property has been rented or used for business purposes.

    What to Do Next

  • Review Ownership Records: Ensure you have documentation for the entire ownership period.
  • Assess Property Use: Determine how the property was used throughout your ownership.
  • Consult Professionals: Engage a Chartered Quantity Surveyor and accountant for advice on your specific situation.
  • Consider the Six-Year Rule: Check if you qualify for this rule if the property was rented.
  • Prepare for Sale: If selling, calculate potential CGT implications ahead of time.
  • Stay Informed: Keep updated on any legislative changes affecting CGT and exemptions.
  • Frequently Asked Questions

    How does the main residence exemption impact my tax return?

    The main residence exemption can reduce or eliminate CGT on your home sale. You must report the sale and claim the exemption in your tax return, affecting your taxable income.

    Can I claim the main residence exemption on a rental property?

    Yes, partially. If the property was your main residence before renting, you may claim a partial exemption for the period it wasn't rented.

    What happens if I move overseas?

    As of 2019, foreign residents are not eligible for the main residence exemption. Plan accordingly if you intend to move overseas.

    Is the main residence exemption applicable in all Australian states?

    Yes, the exemption is a federal tax provision and applies across all states and territories.

    How does the exemption apply to inherited properties?

    If the deceased used the property as their main residence, you might qualify for an exemption or a reduced CGT liability when selling.

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