Australians must lodge their tax returns by Monday to prevent penalties. Penalties may result in an $1,820 fine for delayed submissions. The Income Tax Form 3CEB deadline is today, requiring transfer pricing reports for specific entities. The November 2026 financial calendar contains important deadlines, such as changes to money rules from November 1. A hacker attack on Belgium's tax office has disrupted the MyMinfin system, affecting tax-related services.