The following are the important ATO dates for this month. As per ATO Dates – September 2026

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.

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