Tax Question, page-13

It is like shares, just with shares settlement takes alot less time.

This is from the ATO, it didnt take long to find..
Timing of a real estate CGT event

In the case of the sale or other disposal of real estate, the time of the event is:

• when you enter into the contract (generally the date on the contract), not when you settle – the fact that a contract is subject to a condition, such as finance approval, generally does not affect this date.