Property tax

Hi all,

I am just after some advice in relation to the timing of a CGT event. The situation is as follows;

I currently have a property which is going to be rezoned and have been offered an option by a property developer to purchase the property. I would just like to know does the CGT event occur as of when the option is granted (event D1) or when i decide to accept the option or sell the property and therefore apply event A1?

Thanks in advance

Property tax