The self-lodgement tax deadline falls on 31 October every year, closing the four-month window that opened on 1 July. 8 October 2027 falls inside October, the final month of that window, in the fourth calendar quarter of 2027, with the deadline drawing closer as the month progresses.
Some employers close early or run a shortened day on Friday, ahead of the weekend that follows. 8 October 2027 falls on this day, the last of the five working days counted in the total shown above for its week, immediately before Saturday and Sunday begin the two-day break most standard working arrangements observe.
Contracts and legal deadlines that specify calendar days count every day from 8 October 2027 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.