Monthly due dates

September 2026 Australian Tax Calendar

This month board is the working view for September 2026. Check the scheduled dates first, then use filters below only if you want to isolate BAS, PAYG, super, STP, FBT, lodgment or a specific audience.

1 key dates in this month Employers • Businesses
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Calendar filters

Monthly calendar

Key dates in September 2026

30 September 2026

STP finalisation due for closely held payees

Finalisation due date for closely held payees where this rule applies.

Upcoming STP

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Compliance guides by task

BAS and PAYG next step

Move from quarterly due dates into BAS and sole-trader planning tools.

Employer deadline support

Open employer guidance for super, STP, payroll, and FBT obligations.

Lodgment season support

Use lodgment dates together with the tax return calculator and compliance hub.
This monthMonth indexCalendar homeEmployer viewBAS and PAYG view Deadlines and compliance hub BAS Calculator Tax Return Calculator

FAQ

What is the self-lodgment deadline?

For most individuals, the self-lodgment deadline is usually 31 October each year, with next business day treatment if needed.

Are these dates legal advice?

No. This calendar is informational only. Always confirm your exact obligation on the ATO website or with a registered tax agent.

Next actions after reviewing September 2026