5 June

• Lodge tax returns for individuals and trusts with a 15 May 2027 lodgment due date, provided any liability due is also paid by this date.
• Lodge tax return for companies and super funds with a 15 May 2027 lodgment due date, provided both the prior year and current year return are non-taxable or result in a refund. (Large/medium taxpayers and consolidated group heads are excluded from this concession.)

21 June

• Lodge and pay May 2027 monthly business activity statement.

25 June

• Lodge and pay the 2027 Fringe benefits tax annual return for tax agents, if lodging electronically.

30 June

• Super guarantee contributions paid by this date qualify for a tax deduction in the 2026–27 financial year.
• Child Care Subsidy / Family Tax Benefit recipients and their partners must lodge their 2025–26 tax return by this date regardless of any deferral, to confirm family income with Services Australia.