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the qantas taxes will be low... in the range of a hundred dollars or so.
the qantas fuel surcharges... basically slugging you for the privilege of an award ticket you have already earned will be very high.
easiest way perhaps is to give qantas a call.
alternatively (unless someone else can give you the figure) you can go to most major on line booking travel agency sites and they will quote the total taxes fees and charges (including the very high fuel surcharge).