Capital Gains Tax on Property in Australia: A Complete Guide

Capital Gains Tax (CGT) in Australia is not a separate tax - it is part of income tax. When you sell a property at a profit, the capital gain is included in your assessable income for the financial year of the sale and taxed at your marginal rate. Several exemptions, concessions, and timing strategies can dramatically reduce or eliminate the CGT payable. Understanding these is essential for every property investor and homeowner.

• What triggers CGT: CGT is triggered on a 'CGT event' - typically the signing of a contract of sale (not settlement date). If you sign a contract in June and settle in August, the CGT event occurs in the June financial year. This timing matters for which financial year the gain is included in.
• Calculating the capital gain: Capital gain = sale price minus cost base. The cost base includes the original purchase price plus acquisition costs (stamp duty, legal fees, building and pest inspections), capital improvement costs (renovations, extensions - not repairs), and holding costs not previously deducted (rates, insurance paid during a period when the property was not rented - these are only available for properties acquired after 21 August 1991).
• 50% CGT discount: If you have held the property for more than 12 months, only 50% of the net capital gain is included in your assessable income. This is the most significant CGT concession available to individuals and trustees. Companies do not receive the 50% discount.
• CGT and your marginal rate: The discounted capital gain (50% of the total gain) is added to your other income for the year and taxed at your marginal rate. On a $300,000 gain held for over 12 months: the assessable amount is $150,000, taxed at 47% = $70,500 in CGT. Without the discount, CGT would be $141,000.
• Net capital losses: Capital losses from other asset sales (shares, other properties) in the same year can offset the property capital gain before the 50% discount is applied. Prior-year carried-forward capital losses can also be applied.

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The main residence exemption is the most valuable CGT concession in Australian tax law - completely eliminating CGT on the family home for most Australians. Understanding its requirements and limitations prevents costly mistakes.

• Full exemption conditions: The property is fully exempt from CGT if you lived in it as your main residence for the entire ownership period; you did not use it to produce income during that period; and the land area is under two hectares (or the excess is not separately alienable). The exemption is complete - no CGT regardless of the gain size.
• Partial exemption - periods of income production: If you used the property to produce income (rented it out) for part of the ownership period, the exemption is apportioned. The gain is exempt for the proportion of time it was your main residence and assessable for the proportion it was rented.
• The six-year rule (absence rule): If you move out of your home and rent it out (without nominating another property as your main residence), you can continue treating it as your main residence for CGT purposes for up to six years. After six years, the property is treated as investment property for the period beyond six years. If you move back in (re-establish as your main residence), the six-year clock resets.
• Only one main residence at a time: You can only have one main residence for CGT purposes at any time (with a six-month overlap concession during purchase/sale transitions). Couples living in different properties cannot both claim the main residence exemption on different properties simultaneously.
• Non-residents lose the exemption: From 9 May 2017, Australian non-residents cannot access the main residence exemption on sale. If you own a property that was your main residence and you become a non-resident, selling while a non-resident forfeits the exemption on gains accrued after that date. This catches many Australians who move overseas unexpectedly.

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Investment properties that were never your main residence are fully subject to CGT on sale. Understanding the calculation, cost base rules, and timing strategies reduces the tax outcome.

• The cost base - getting it right: Many investors underestimate their cost base and therefore overestimate their CGT liability. The cost base includes: purchase price, stamp duty, legal fees, building and pest inspections (acquisition costs), capital improvements (not repairs and maintenance), borrowing costs incurred on acquisition (loan establishment, mortgage insurance), and advertising costs on sale.
• Depreciation and cost base adjustment: Depreciation claimed on Division 40 assets (plant and equipment) reduces the cost base of those assets by the amount claimed. If you claimed $10,000 in depreciation on carpets and appliances, the cost base of those assets reduces by $10,000. This creates a higher net gain on sale - the depreciation deductions are effectively recaptured through CGT.
• Division 43 (building depreciation) - no cost base reduction: For properties where building depreciation (Division 43 at 2.5%/year) was claimed, the cost base of the building is not reduced by the depreciation claimed. This is a favourable rule - unlike plant depreciation, building depreciation does not increase your CGT on sale.
• First used to produce income - the valuation event: If you move out of a property and rent it out (without previously nominating it as your main residence), the cost base for future CGT calculation is reset to the market value at the date it first became a rental property. This is a significant - and often missed - provision that reduces future CGT.
• Selling costs reduce the capital proceeds: Real estate agent commission, legal fees, and advertising costs on sale reduce the capital proceeds (sale price) in the CGT calculation - effectively reducing the capital gain. Ensure all selling costs are included in the calculation.

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The financial year in which a capital gain is realised determines what other income it is combined with for tax purposes. Strategic timing of property sales can meaningfully reduce CGT.

• Sign the contract in the right year: CGT event timing is the contract date, not settlement. If you are close to the end of a financial year, signing slightly before or after 30 June determines which year the gain is assessed in. A gain assessed in a year when you have capital losses, lower income, or large deductions may be taxed at a lower effective rate.
• Year of retirement or reduced income: Selling an investment property in the year you retire (or in the first part-retirement year) means the capital gain is added to a lower income base - potentially pushing less of the gain into the 47% bracket compared to a sale in a full-employment year.
• 12-month holding period - non-negotiable: Never sell a property that has appreciated in value before holding it for at least 12 months. The 50% CGT discount is one of the most valuable tax concessions available - losing it by selling at 11 months doubles the effective CGT rate on the gain.
• Capital loss harvesting against property gains: If you hold shares or other assets sitting at a loss, selling these before 30 June in the same year as a property sale generates capital losses that directly offset the property gain - before the 50% discount is applied. The tax saving can be significant.
• Partial year income management: In the year of sale, consider whether deferring other income (freelance invoices, business revenue) past 30 June reduces the marginal rate at which the capital gain is taxed. Even shifting $20,000 of other income from a 47% rate year to a 39% rate year saves $1,600 on that income.

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CGT errors on property are among the most expensive and common tax mistakes made by Australian property owners. These are the ones the ATO sees most frequently.

• Forgetting the contract date rule: Sellers who expect the CGT event to fall at settlement are surprised when the ATO assesses the gain in the financial year of the contract signing. Know your contract date before 30 June.
• Missing cost base inclusions: Stamp duty, legal fees, building inspections, loan establishment costs, and capital improvements add to the cost base and reduce the gain. Many sellers rely only on the purchase price - understating the cost base and overpaying CGT.
• Incorrectly claiming the main residence exemption: The ATO data-matches property ownership with rental income declarations. Claiming full main residence exemption on a property that produced rental income is a common audit trigger. The six-year rule is a specific concession - not a blanket exemption for any property you once lived in.
• Ignoring the non-resident CGT rules: Australian non-residents are subject to mandatory PAYG withholding of 12.5% of the property sale price (not the gain - the gross sale price) unless they apply for a variation. For a $1 million sale, this is $125,000 withheld at settlement, pending tax return assessment.
• Not obtaining a quantity surveyor report: A QS report documents the cost of depreciable assets for Division 40 purposes. Without it, the ATO may dispute your depreciation claims - and without records of the depreciable asset values, you cannot accurately calculate the cost base adjustment on those assets when you sell.

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