Quick Answer: Key 2026 Tax Deadlines.
1 July 2026: Tax lodgment officially opens for the 2025–26 financial year.
Mid-to-late July 2026: The "Sweet Spot" for lodging (when most pre-fill data is available).
31 October 2026: The deadline to lodge your own return if you are not using a tax agent.
15 May 2027: The extended deadline if you are registered with an online tax agent like Tax Falcon.