As a hypothetical example: property is acquired 10 years ago for $500,000.
Sold after 1 July 2027 for $600,000.
Indexation in that time lifts the cost base to $700,000.
Can you declare a $100,000 capital loss?
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That isn't how it will work. From ATO link below
"the CGT reforms will only apply to gains that accrue after 1 July 2027."
From the budget 2026-27 Tax Explainer (hyperlink)
"The 50 per cent CGT discount will apply to the difference between the asset’s cost base and its value at 1 July 2027. Indexation and the minimum tax will be used to calculate the CGT on gains accruing from 1 July 2027 (using the asset’s value at 1 July 2027 as the asset’s cost base). "
Hi @south1212
The measures announced in the 2026 Federal Budget are not yet law. It's too early for us to be able to comment, but you can read more about the proposed changes in the 2026-27 Budget papers.
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