21 September

• Lodge and pay August 2026 monthly business activity statement.

30 September

• Lodge PAYG withholding payment summary annual report, if prepared by a BAS agent or tax agent (excludes large withholders whose annual withholding is greater than $1 million).
• Lodge Annual TFN withholding report 2026 if a trustee of a closely held trust has been required to withhold amounts from payments to beneficiaries.