OhSpareMe - Unfortunately I don't have a reference for you....
However, I believe the problem for Pilots and our friends in the ' Merchant Navy' is based on their requirement to spend a large percentage of time OS, that is
NOT in Singapore (or Australia).
From what I understand, one of the numerous qualifying tenets of the 'Agreement' is that you must reside in Singapore for '183 days or greater' to be recognised as a 'Resident for Tax Purposes'....
However, I am also equally sure that a Taxation Expert (either based in OZ or Singapore) will know ways around this..
As a suggestion - Any Pilot who ends up being sent to Singapore....As a priority - ascertain independent
EXPERT Tax advice prior to leaving Australia. DO NOT rely upon AIPA or QF to answer all your possible questions....