The self-lodgement tax deadline falls on 31 October every year, closing the four-month window that opened on 1 July. 6 October 2029 falls inside October, the final month of that window, in the fourth calendar quarter of 2029, with the deadline drawing closer as the month progresses.
Any deadline or bill payment due on Saturday 6 October 2029 moves to the following Monday under standard business-day rules, since Saturday is not a working day for the Monday-to-Friday workforce this page counts by default. Shift-based industries follow their own separate rostering rules instead of this convention.
Contracts and legal deadlines that specify calendar days count every day from 6 October 2029 including weekends and public holidays, while deadlines specified in working or business days count only the days this page includes in its working-day total. The difference between the two conventions can shift a deadline by several days once weekends and holidays are counted.