When Is Tax Return 2026 Due? Every Key Date for the 2025-26 Return

Tax return 2026: all dates at a glance

The 31 October rule, and the Saturday quirk

The standard individual deadline is 31 October following the end of the financial year. When it lands on a weekend, as it does in 2026, the ATO accepts lodgment on the next business day without penalty: Monday 2 November 2026. Don't plan around the extra two days; plan around October.

Miss it and the failure to lodge penalty clock can start: $364 for each 28 days late, up to $1,820 per return. Full detail in our late tax return fine guide. Returns that produce a refund generally escape penalty, but why leave your own money with the ATO?

Want more time? The tax agent extension

Registered tax agents lodge under the ATO's lodgment program, which extends most clients' deadlines well past October, commonly to 15 May 2027, with interim dates depending on your prior-year outcome. The catch everyone misses: you must be on the agent's client list by 31 October 2026 to get the extended date. Signing up in November doesn't retro-fit the extension, although an agent can still lodge and argue your case. See how remission works.

One more agent benefit: even if your return produces a bill, agent-program lodgment often defers the payment due date too.

When should you actually lodge? Not 1 July

Lodging in the first fortnight of July is the number-one cause of amended returns: employer income statements aren't finalised, bank interest and dividend pre-fill hasn't landed, and health fund data is missing. The ATO itself recommends waiting until pre-fill completes, typically late July. Lodge then for the fastest, cleanest refund, and see how long processing takes.

Already behind from earlier years? The 2026 deadline is the least of it. Start with the overdue tax returns guide.

Key dates beyond the return itself

Every quarterly and monthly date is set out in quarterly BAS due dates 2026-27.

Dates and penalty rates checked July 2026.

General information only - not personal tax, financial or legal advice. Consider your own circumstances or speak to a registered tax agent. Remission of penalties or interest and payment plans are decisions of the ATO and outcomes can't be guaranteed.