@wce: Only with a formal Liquidator's declaration that shares are worthless. And if no declaration is made by a liquidator or administrator, shareholders must wait until a court order is given to dissolve the company (i.e. once it ceases to exist).
ATO has a section on this here:
https://www.ato.gov.au/CGTsharesinacompanyinliquidationoradministration
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