30 September 2026
- Lodge PAYG withholding payment summary annual report if prepared by a BAS agent or tax agent, excluding large withholders whose annual withholding is greater than $1 million.
21 October 2026
- 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.
28 October 2026
- 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.
31 October 2026
- Pay quarter 1, 2026–27 instalment notice (Form R, S, or T). Lodge the notice only if you vary the instalment amount.
- Lodge tax returns for all entities if one or more prior year returns were outstanding as at 30 June 2026.
- Lodge tax return for all entities prosecuted for non-lodgement of prior year returns and advised of a lodgement due date of 31 October 2026.