sle, the date for cgt purposes is the date the option is...

sle, the date for cgt purposes is the date the option is exercised. not the date you bought the Option.

Options expired on 31 March 2009.

when you exercise the option, the ATO say that is a CGT event.
am not sure if it is date of your payment to exercise the option, or the formal expiry date of Option (ie 31 march 2009).

anyway, if you use 31 march 09 you can't really go wrong.

so from 50c exercise price to 80c - a 30c gain in 12mths.

hope you have heaps

cheers