21 October

• Pay annual PAYG instalment notice (Form N). Lodge only if you vary the instalment amount or use the rate method to calculate the instalment.
• Lodge and pay quarter 1, 2026–27 PAYG instalment activity statement for head companies of consolidated groups.
• Lodge and pay September 2026 monthly business activity statement.

28 October

• Lodge and pay quarter 1, 2026–27 activity statement, if lodging by paper.
• Pay quarter 1, 2026–27 instalment notice (Form R, S, or T). Lodge the notice only if you vary the instalment amount.
• Lodge and pay annual activity statement for TFN withholding for closely held trusts where a trustee withheld amounts from payments to beneficiaries during the 2025–26 income year.

31 October

• Final date to add new clients to your client list to ensure their 2026 tax return is covered by the lodgment program.
• Lodge tax returns for all entities if one or more prior year returns were outstanding as at 30 June 2026.
• Lodge and pay Self-managed superannuation fund annual return for new registrant SMSFs.
• Lodge tax return for all entities prosecuted for non-lodgment of prior year returns and advised of a lodgment due date of 31 October 2026.
• Lodge Annual investment income report (AIIR).
• Lodge Departing Australia superannuation payments (DASP) annual report.
• Lodge Franking account tax return when both eligibility conditions apply.
• Lodge PAYG withholding reports (NAT 3448, NAT 7187, NAT 12413).
• Lodge lost members report for 1 January – 30 June 2026.
• Lodge TFN report for closely held trusts.
• Lodge not-for-profit self-review return for eligible NFP entities.