BAS due date finder 2026-27
Picture the last week of October. The phone's going, a client wants to know if their BAS is late, and you're trying to remember whether the agent concession covers this quarter. This finder does the lookup for you. Pick quarterly, monthly or annual GST, choose the period, and say whether it goes through a registered tax or BAS agent. You'll get the due date, the day it lands on, and a note when a weekend pushes it out. Every date comes from the ATO's published due dates, linked under the result. It's a date check. Not tax advice. If a client's situation is unusual, the ATO page has the final word.
Answer the questions above to see the due date.
How this works
Look up the original due date for the period. If a registered agent lodges electronically and the period has a lodgment program date, use the program date. If the date is a Saturday or Sunday, move it to the next Monday and show both. Count the days from today. For an annual GST return, the date is 31 October when the business lodges an income tax return, and 28 February after the annual tax period when no income tax return is required.
Sources: ATO, due dates for lodging and paying your BAS (updated 17 Sep 2026); ATO, registered agent lodgment program, activity statements (updated 1 Jul 2026).
Frequently asked questions
Does the agent concession apply to every quarter?
No. The ATO's 2026-27 lodgment program gives later dates for quarters 1, 3 and 4 when a registered agent lodges electronically. Quarter 2 is due 28 February 2027 whichever way you lodge, because that date already includes extra time.
What if the due date falls on a weekend?
The ATO says you have until the next business day. The finder shows both dates. The same rule applies if the day is a public holiday where you are.
When is the December monthly BAS due?
It's due 21 January 2027. Under the ATO's registered agent lodgment program, clients with turnover up to $10 million who report GST monthly and lodge electronically have until 21 February 2027. Businesses registered for deferred GST can't use that concession.
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Lodgement season calendar · Answering the phones through BAS and tax time · All accountant tools
General information only, not tax, legal or financial advice.