Clearly people here are again getting confused between share trading and investing and the tax implications
I am assume from Heads question he is a share trader and is accounting for gains and losses as income not capital.
In this case you can bring to account the lower of cost or market value at 30 June and each parcel of shares purchased can be valued differently.
As for selling share prior to 30 June and buying them back after 30 June to crysalise a loss. The ATO have flagged this as a type of transaction they are going to pay attention to and unless a very good reason (other than the tax loss) can be given the ATO will assess you as if the transaction had not happened.
ASX Price at posting:
0.0¢ Sentiment: Buy Disclosure: Not Held
A personalised tool to help users track selected stocks. Delivering real-time notifications on price updates, announcements, and performance stats on each to help make informed investment decisions.
(20min delay)