Australia Day is statutorily observed on 26 January. If 26 January falls on a weekend, the public holiday is observed on the following Monday. 

To determine the day of the week for 26 January 2026:
* 1 January 2025 was a Wednesday.
* 2025 is a standard 365-day year, meaning the calendar shifts by 1 day, making 1 January 2026 a Thursday.
* 26 January is exactly 25 days after 1 January.
* 25 days modulo 7 days/week leaves a remainder of 4 days.
* Thursday plus 4 days is Monday.

Since 26 January 2026 falls on a Monday, the public holiday is observed on the actual day without needing a substitute day.

26 January 2026