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Key Dates 2026-27: BAS, STP Finalisation, TPAR

Updated 17 October 2026 · General information · 3 min read

General information only, not tax or financial advice. This site is not the ATO. Check ato.gov.au or ask a registered tax agent. Last checked against ATO and Parliament sources: 17 October 2026. Examples use made-up numbers. Dates and amounts marked uncertain should be re-checked.

Short answer: The ATO lists fixed quarterly BAS dates and says that if a due date falls on a weekend or public holiday you generally have until the next business day. Shifts we calculated from that rule are marked uncertain. The old quarterly super dates are not listed here as current deadlines.

Download these dates (.ics)

The file is built in this browser from the table below. Inferred dates say so in the event title. Nothing is uploaded.

Quarterly BAS

From the ATO BAS due-dates page, last updated 17 September 2026, read in full on 17 October 2026.

• The ATO says online lodgers may get an extra 2 weeks for quarterly BAS, not for quarter 2, which already includes a one-month extension. A registered tax agent or BAS agent may have a different lodgment program.
• Monthly BAS: the 21st of the following month, for GST turnover of $20 million or more, or if you are directed to lodge monthly. You can choose monthly below that threshold.
• Annual GST returns: 31 October, or 28 February if you are not required to lodge a tax return. How the weekend rule applies to those annual dates in 2026-27 was not worked through on this page.

STP end-of-year finalisation

ATO excerpts say the finalisation declaration is due by 14 July each year. Wednesday 14 July 2027 applies that recurring date to 2026-27. The STP page was seen as an excerpt, not read in full. Closely held payees generally have a later date of 30 September. Thursday 30 September 2027 is that recurring date applied to this year. Small employers with only closely held payees follow the payee's tax return due date, which was not tabulated here.

TPAR

ATO excerpts say the Taxable payments annual report is due by 28 August each year, for contractors in certain industries, and that paper lodgment is no longer accepted. For 2026-27 payments that recurring date is Saturday 28 August 2027. A weekend rule for TPAR was not verified, so this page does not move it to the next Monday. A non-lodgment advice is needed if you paid contractors in a relevant industry but have nothing to report, on the ATO's description in the excerpt. The industry list was not re-read on the ATO page.

FBT and agent programs

The fringe benefits tax year and the 2026-27 BAS agent lodgment program were not read for this site. Background notes often put the FBT year end at 31 March. That date is not stated here as a checked figure.

Questions

Which dates did we read in full?

The BAS due-dates page. STP and TPAR facts come from ATO search excerpts, which is why those rows are uncertain.

Are agent dates different?

They can be. See the ATO agent lodgment program. That program for 2026-27 was not read.

What we could not verify