14 August, 2025
August 11: Q4 (April–June) activity statements lodged electronically – final date for lodgement and payment.
August 14: PAYG withholding payment summary annual report – final date for lodgement.
August 21: Lodge and pay July monthly activity statement.
August 21: Final date for eligible monthly GST reporters to elect to report GST annually.
August 28: Taxable payments annual report due for lodgement for many key industries