BAS Due Dates 2026–27

Every BAS deadline for the 2026–27 financial year — with the online lodgment concession and tax agent dates included. Pick your cycle below or read the full table.

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Quarterly BAS due dates 2026–27

QuarterStandardSelf-lodged online*Via agent†
Q1: Jul–Sep 202628 Oct 202611 Nov 202625 Nov 2026
Q2: Oct–Dec 20262 Mar 2027‡2 Mar 2027‡2 Mar 2027‡
Q3: Jan–Mar 202728 Apr 202712 May 202726 May 2027
Q4: Apr–Jun 202728 Jul 202711 Aug 202725 Aug 2027

* The 2-week online concession doesn't apply to Q2 (its due date already includes a one-month extension). † Typical agent lodgment program dates — your agent confirms your exact date. ‡ 28 Feb 2027 falls on a Sunday and Monday 1 March 2027 is Labour Day in Western Australia. The ATO treats a day as a public holiday if it is one for the whole of any state or territory, so the due date rolls to Tuesday 2 March 2027 for everyone.

If you pay PAYG instalments, they are reported on this same activity statement and share these dates. One important exception: if PAYG instalments are your only obligation, the ATO sends an instalment notice (BAS R/S/T) rather than an activity statement, and instalment notices are excluded from the 2-week online concession — see PAYG instalment due dates.

Monthly BAS due dates 2026–27

PeriodDuePeriodDue
Jul 202621 Aug 2026Jan 202722 Feb 2027*
Aug 202621 Sep 2026Feb 202722 Mar 2027*
Sep 202621 Oct 2026Mar 202721 Apr 2027
Oct 202623 Nov 2026*Apr 202721 May 2027
Nov 202621 Dec 2026May 202721 Jun 2027
Dec 202621 Jan 2027Jun 202721 Jul 2027

* Shifted from a weekend to the next business day.

FAQ

When is my quarterly BAS due?

Standard quarterly BAS due dates are: Q1 (Jul–Sep) 28 October, Q2 (Oct–Dec) 28 February — 2 March 2027 for 2026–27, because 28 February is a Sunday and 1 March is a WA public holiday — Q3 (Jan–Mar) 28 April, Q4 (Apr–Jun) 28 July. If a due date falls on a weekend or public holiday, you can lodge and pay on the next business day.

Do I get extra time lodging my BAS online?

Yes. If you lodge your own quarterly BAS online you may be eligible for an extra 2 weeks — except Q2, which already includes a one-month extension (its due date stays 28 February, or 2 March 2027 for 2026–27).

Do I get extra time using a tax or BAS agent?

Usually. Under the agent lodgment program, quarterly BAS lodged by an agent are typically due about 4 weeks after the standard date (Q2 stays 28 February, or 2 March 2027 for 2026–27). Your agent will confirm your exact date.

When is monthly BAS due?

The 21st of the following month. For example, the July BAS is due 21 August. If the 21st falls on a weekend or public holiday, the next business day applies.

When is the annual GST return due?

31 October, or 28 February following the annual tax period if you are not required to lodge an income tax return.

Source: ATO — Due dates for lodging and paying your BAS. Verified 21 August 2026.

Disclaimer: TaxDates provides general information only, current at the date shown on each page. It is not tax, legal or financial advice, and does not consider your circumstances. Deadlines can change and exceptions may apply — always confirm with the ATO, ASIC or a registered tax professional.