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, excluding 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.