No Qantas pilot dobbed in Cathy pilots to the ATO. Approx 15 years ago a Qantas pilot who wanted to work overseas on a contract was advised by a deputy commisioner in the ATO to seek a private ruling. In their application they painted 3 different scenarios of how they could be employed with commuting to Aus been one of them. A ruling was issued that then becomes binding and is available to the public on the ATO web site. That ruling indicated that having a family in Australia while working overseas and spending more than a certain number of days in Aus per year meant you were liable for Australian tax.