The self-lodgement tax deadline falls on 31 October every year, closing the four-month window that opened on 1 July. 29 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.
A public holiday landing on a Thursday sits one day short of the weekend, and workers commonly take the Friday after it as annual leave to turn a single day off into a four-day break. Thursday 29 October 2026 falls on this day of the week, one working day ahead of Friday and two ahead of the weekend that follows it.
The quarter containing 29 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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