According to Wikipedia:
In Australia, a fiscal year is commonly called a "financial year" (FY) and starts on 1 July and ends on the next 30 June. Financial years are designated by the calendar year of the second half of the period. For example, financial year 2017 is the 12-month period ending on 30 June 2017 and can be referred to as FY2016/17.
CoinTracker currently treats the first half of the period as the tax year. We should change this to avoid any confusion for users.