For CGT purposes
Selling Price less selling expenses (Auctioneers and legal exps etc)
Deduct Purchaes price
Purchase Exps (Auctioneers and legal exps etc)
(Increase both of the above by multiplier see
here appendix 1
Selling price - purchase price = Profit
You can then deduct according to the following formula:
Number of months lived in property plus 12 months* over number of months property owned
* You are allowed 12 months to sell property without being liable to CGT. As far as I know you would be able to apply for this.
In your case 60/168
Amount liable to CGT Profit - 60/168
Less Annual exemption 1270
Balance CGT * 20%
As you are non residence in Ireland you will not get a clearance certificate. If the selling price is over Euro 500.000 the purchaser is supposed to deduct 15% of the price of the house and return to revenue but when you make your return you can deduct this tax from your liability. See Chapter 10 of the above link
See also Chapter 11 section 1 for worked examples
You may also have a liability to the tax authorities in Australia
Hope this makes sense.