21 October

Monthly BAS/IAS due — lodge and pay September 2026 monthly activity statement

21 October

PAYG instalment notice due — Q1 (Jul–Sep 2026)

31 October

Company, individual, trust & partnership tax returns due — FY2025–2026 self-lodgers (30 Jun year-end)

31 October

Deadline to engage a registered tax agent for extended lodgement (to 15 May 2027)

21 November

Monthly BAS/IAS due — lodge and pay October 2026 monthly activity statement

25 November

Quarterly BAS (Q1) — registered BAS/tax agent electronic lodgement extension

21 December

Monthly BAS/IAS due — lodge and pay November 2026 monthly activity statement

31 January

Large/medium trust tax returns due — trusts with income over $10M for FY2026–2027

Note

No standard monthly BAS/IAS due — Dec and Jan both due 21 February 2027 (ATO Christmas concession)

21 February

Monthly BAS/IAS due — December 2026 AND January 2027 activity statements both due this date

28 February

Individual & trust tax returns — FY2026–2027 where prior year liability was $20,000+

28 February

PAYG instalment notice due — Q2 (Oct–Dec 2026)

21 March

Monthly BAS/IAS due — lodge and pay February 2027 monthly activity statement

31 March

End of Fringe Benefits Tax (FBT) year — FBT year covers 1 April 2026 to 31 March 2027

21 April

Monthly BAS/IAS due — lodge and pay March 2027 monthly activity statement

28 April

PAYG instalment notice due — Q3 (Jan–Mar 2027)

15 May

Individual, partnership, company & trust tax returns — FY2026–2027 via registered tax agent (standard concession)

21 May

Monthly BAS/IAS due — lodge and pay April 2027 monthly activity statement

26 May

Quarterly BAS (Q3) — registered BAS/tax agent electronic lodgement extension

05 June

Concessional lodgement deadline — returns not required by 15 May (payment required at lodgement)

21 June

Monthly BAS/IAS due — lodge and pay May 2027 monthly activity statement

21 June

Recommended date for FY2027 personal super contributions to clear by 30 June

25 June

FBT return and payment — tax agent electronic lodgement extension

14 July

STP finalisation due — finalise Single Touch Payroll data for FY2026–2027

21 July

Monthly BAS/IAS due — lodge and pay June 2027 monthly activity statement