The self-lodgement tax deadline falls on 31 October every year, closing the four-month window that opened on 1 July. 13 October 2026 falls inside October, the final month of that window, in the fourth calendar quarter of 2026, with the deadline drawing closer as the month progresses.
Tuesday 13 October 2026 is an ordinary working day in the standard Monday-to-Friday week, sitting in the first half of its week and counting toward the working-day total shown above. It follows the return-to-work adjustment of Monday and precedes the midweek point that Wednesday marks in most Australian workplaces running a standard five-day schedule.
The quarter containing 13 October 2026 is based on the calendar year running January to December, a separate system from the Australian financial year, which runs from 1 July to 30 June and splits into its own four quarters. Businesses often track both systems side by side, one for tax filings and one for calendar-year planning.
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