BAS due dates with a countdown
Quarterly BAS due dates for Australian sole traders and small businesses, for the current financial year and the next. The standard dates are 28 October, 28 February, 28 April and 28 July. This page rolls weekend dates forward, shows the registered agent dates, counts down to your next BAS in Sydney time, and gives you a calendar file so the reminders live in your phone.
2026-27 quarterly BAS due dates (current year)
| Quarter | Period | Due date | Via registered agent |
|---|---|---|---|
| Q1 | July to September | Wednesday 28 October 2026 | 25 Nov 2026 |
| Q2 | October to December | Monday 1 March 202728th is a weekend, rolled forward | 1 Mar 2027 |
| Q3 | January to March | Wednesday 28 April 2027 | 26 May 2027 |
| Q4 | April to June | Wednesday 28 July 2027 | 25 Aug 2027 |
Four all-day events with reminders 7 days and 1 day before. Opens in Apple Calendar, Google Calendar or Outlook.
2027-28 quarterly BAS due dates
| Quarter | Period | Due date | Via registered agent |
|---|---|---|---|
| Q1 | July to September | Thursday 28 October 2027 | 25 Nov 2027 |
| Q2 | October to December | Monday 28 February 2028 | 28 Feb 2028 |
| Q3 | January to March | Friday 28 April 2028 | 26 May 2028 |
| Q4 | April to June | Friday 28 July 2028 | 25 Aug 2028 |
Four all-day events with reminders 7 days and 1 day before. Opens in Apple Calendar, Google Calendar or Outlook.
Weekends and public holidays. When a due date lands on a Saturday, Sunday or public holiday, the ATO moves it to the next business day. This page rolls weekends forward automatically but does not know about public holidays, so check the ATO if the 28th is near one.
Agent concessions. If a registered tax or BAS agent lodges for you, quarters 1, 3 and 4 usually get about four extra weeks (25 November, 26 May and 25 August). Quarter 2 already has an extra month built in for everyone, so its agent date stays 28 February.
Lodging online yourself. The ATO may give you an extra two weeks on quarters 1, 3 and 4 if you lodge through ATO Online. Your exact date is shown in ATO Online services, and that date wins over anything here. Monthly BAS lodgers are due on the 21st of the following month.
Email me these results
The numbers above, then a few short emails on getting your BAS done. Unsubscribe any time.
How it works
- A quarterly BAS covers three months and is due 28 days after the quarter ends, except the October to December quarter, which gets until 28 February because of the holiday period.
- When the 28th falls on a weekend or public holiday, the ATO moves the due date to the next business day. Lodging through a registered tax or BAS agent usually adds about four weeks to quarters 1, 3 and 4.
- Download the .ics file to add all four dates to Apple Calendar, Google Calendar or Outlook, each with reminders 7 days and 1 day before. Nothing is uploaded; the file is built in your browser.
Embed this tool on your site
Paste this code into any page of your website, blog or client portal and the tool appears there, kept up to date by us. It works on WordPress, Squarespace, Wix, Webflow and anything else that accepts HTML.
<iframe src="https://flowfi.com.au/embed/bas-due-dates" width="100%" height="520" style="border:0" title="BAS due dates with countdown, by FlowFi"></iframe>Free to embed, please keep the Powered by FlowFi link.
FlowFi does this automatically, every quarter
Upload your bank statement and the AI categorises every transaction, works out the GST, tracks your deductions and builds a BAS you can lodge in minutes. Pro is $29 a month or $290 a year. The first 14 days are free and there is no card to enter.
Start 14-day free trial