Log into your registry account for A40. Do you still have the shares?
For as long as the shares are still in your account (registry account, not broker account) then you cannot claim the loss, as you have not lost them. They are de-listed from the ASX, but still in your ownership.
The registry account you will need to log into will be Computershare as per
https://www.marketindex.com.au/asx/a40When the shares are no longer in your account, you will be able to claim the tax loss, keep an eye out for an official notice from the company to shareholders as you will likely need that as evidence for the ATO.
Please do your own research and validate everything said above, I am not a tax accountant, my information could be wrong.
