A Capital Gains Tax (CGT) valuation is a professional assessment of the market value of an asset – typically property – at a specific point in time, used to calculate the capital gain or loss when that asset is sold, transferred, or otherwise disposed of.
CGT is not a separate tax in Australia – it’s part of your income tax. A CGT valuation helps determine the difference between the asset’s cost base and its sale price, which is the taxable gain. A valuation is especially important when:
- The original purchase price is unknown or undocumented
- The asset was acquired before CGT was introduced (pre-1985)
- The asset was inherited, gifted, or transferred between related parties
- The property’s use changed (e.g. from principal residence to investment)
- You’re applying CGT concessions or exemptions

