There is a CGT Exemption if you have bought a property moved in straight away, (so it was not rented prior to you moving in), you can rent out your property for 6 years continuously and claim tax deductions for any expenses incurred, ie. interest on mtg etc but you also have to declare the rental income as assessable income.
Provided that you do not sell another property in the 6 year rental period at the same time you are selling this one you are CGT exempt as you are treating this property as your main residence!