ATO Announcement on claiming deductions for education expenses against Youth Allowance income:
As a result of a High Court decision on 11 November 2010, taxpayers may be eligible to claim a deduction for study expenses if they received youth allowance to study full-time.
If you were eligible for a deduction in the years 2007, 2008, 2009 or 2010 the ATO will be writing to advise you that they will be amending your assessment(s) for those years. You will receive a letter from the ATO between 1 March 2011 and 30 April 2011.
(Source: ATO)