Dear Officer, I purchased my first residential house in year 2001 for an amount of $200K, then I rented it out as investment house in around Dec-2018 after purchased my second house, finally I sold the first house for $1.2M in Jan-2026. Can I calculate the cost base as ($1.2M - $200K)/25*18 + $200K = $920K? Is so, my gross capital gain will be ($1.2M - $920K)* 50% = $140K. Am I correct? Many thanks, Regards, Ange
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No. Cost base (element 1) must be market value as at date when first income producing. Rule is below
Using your home for rental or business | Australian Taxation Office
Consider the 6 year rule to minimise any gain.
Treating former home as main residence | Australian Taxation Office
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