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Every year, thousands of Australians either rush their tax return and miss deductions or miss the deadline entirely and end up waiting for a penalty letter.
Many people don’t realise there’s a third option. When a registered agent lodges your return, you can get more than six extra months, with no forms to fill in and no reason to give the ATO.
This guide explains how the process works, who is eligible, the key deadline to remember, and the important conditions often overlooked.
The short answer: If you’re on a registered agent’s client list before 31 October 2026, most individuals can lodge their 2025–26 return as late as 15 May 2027. Some people get an earlier date: 31 March 2027 if their last return showed $20,000 or more in tax payable, or 31 October 2026 if an earlier return was still outstanding on 30 June 2026. Self-lodgers must lodge by Monday, 2 November 2026.
Why Do Registered Agents Get More Time?
Registered agents look after thousands of clients. They couldn’t possibly lodge every return between July and October. So, the ATO gives them a special lodgement program that spreads the workload across the year.
Agents have to meet the ATO’s on-time lodgement targets. In return, their clients get later due dates. When your agent gets more time, so do you. As a result, there is no need to request an extension for this date. You get the extra time simply by becoming a client of a registered agent.
What Is the Deadline for Tax Returns Lodged Through a Tax Agent for 2025–26?
For most individuals, it’s 15 May 2027. But the program gives different dates to different people, depending on your lodgement history and how much tax you paid last year.
| Your situation | Lodgement due date | Why |
| Individuals registered on a tax agent’s client list by 31 October 2026. | 15 May 2027 | The standard program date |
| Your latest return showed $20,000 or more in tax payable | 31 March 2027 | The ATO wants larger liabilities assessed sooner |
| One or more prior-year returns still outstanding on 30 June 2026 | 31 October 2026 | Your history rules out the later date |
| You were prosecuted for not lodging earlier returns | Either 31 October 2026 or the date specified in your letter from the ATO | The ATO sets your date directly |
| You lodge yourself through myTax | Monday 2 November 2026 | This year, 31 October falls on a Saturday. |
If your return is due on 15 May 2027, the ATO won’t apply a late lodgement penalty as long as you lodge and pay anything owing by 5 June 2027. This arrangement is a concession, not a replacement for the official deadline, so don’t rely on it as your primary plan.
What Happens If Previous Tax Returns Are Still Pending?
Having an outstanding tax return from an earlier financial year may make you ineligible for the May lodgement deadline for your current return. If that’s you, tell your agent upfront. Depending on your situation, your tax agent may be able to seek additional time for earlier returns and help you clear the backlog.
How Do I Get the Extension? It Comes Down to One Date
Firstly, you need to be formally added to a registered agent’s client list before 31 October 2026. Your agent does this through the ATO’s online services for agents, which links your tax file number to their practice.
A few things that don’t count:
- Sending an enquiry form or asking for a quote
- Booking an appointment for some time in November
- Planning to “sort it out with the accountant later”
If you’re new to an agent or switching from one agent to another, treat Friday 30 October as your real cut-off. 31 October falls on a Saturday this year, and your agent needs time to confirm your identity and add you to their client list.
Does a Tax Return Extension Need ATO Approval?
No. Once you’re on an agent’s list, the later date applies automatically. You won’t receive a letter confirming it, so ask your agent which due date applies to you.
Can I Request Extra Time If I Lodge My Tax Return Myself?
Only in limited cases. Self-lodgers can ask the ATO to defer their due date, but approval depends on genuine circumstances such as serious illness or a natural disaster, and each request is assessed on its merits. Joining an agent’s program is far simpler.
When Is Payment Due If My Tax Agent Lodges My Return in May?
A later lodgement date doesn’t give everyone the same later payment date. For returns due on 15 May 2027, the ATO uses staggered payment dates based on when your return is actually lodged.
| When your agent lodges | Latest payment date |
| On or before 12 February 2027 | 21 March 2027 |
| 13 February to 12 March 2027 | 21 April 2027 |
| From 13 March 2027 | 5 June 2027 |
These are the latest dates you’ll need to pay by. If the ATO takes time to process your return, your payment deadline can also be pushed back. Check your notice of assessment to confirm the actual due date.
If your return has a different due date, such as 31 March, payment is generally due 21 days after the lodgement due date, or seven business days after your notice of assessment is deemed received, whichever is later.
Will Waiting Until May Delay My Refund?
Not unless you wait. 15 May is the last day you can lodge, not the first. If you’re expecting a refund, your agent can lodge as soon as your paperwork is ready. Most refunds arrive within about two weeks of lodging online.
The extra time is there for when you need it, such as:
- Waiting on a rental property statement
- A trust distribution that isn’t finalised yet
- Crypto records you need to sort out
- Months of business bookkeeping to catch up on
Is It Worth Using a Registered Agent Just for the Extra Time?
If you have one job and a few deductions, you can usually lodge your tax return yourself through myTax. But extra time isn’t the only benefit an agent offers. A registered agent can:
- Find deductions you may not know about
- Get rental, investment, crypto and business income right the first time
- Check your pre-filled figures for mistakes before the ATO spots them
- Talk to the ATO for you if any questions come up later
Are Agent Fees Tax Deductible?
Yes. The cost of managing your tax affairs, including fees paid to a registered agent, is generally deductible. You claim it in the year you pay it, so a fee paid in early 2027 goes in your 2026–27 return.
How Can I Tell If an Agent Is Actually Registered?
Only registered agents can charge a fee to prepare and lodge your return, and only registered agents can give you access to the later lodgement dates. Before you hand over your details, search the Tax Practitioners Board (TPB) public register. It’s free and takes a minute. An unregistered preparer can’t legally charge for tax returns and can’t get you the extension.
Missed the 31 October Cut-Off? What Now?
If you weren’t added to an agent’s list in time, the standard tax filing rules apply, and your return is due on Monday 2 November 2026. Lodge as soon as you can. A registered agent can still prepare and lodge it for you after that date, but late lodgement penalties may apply to the return.
From 1 July 2026, the failure to lodge penalty is $364 for every 28 days, or part of 28 days, that a return is overdue, up to $1,820. The ATO generally doesn’t issue the penalty when a late return results in a refund or nil amount. Next year, the fix is simple: get on an agent’s list well before October.
Your Checklist Before 31 October
- Choose a registered agent and check them on the TPB register.
- Make contact by Friday 30 October and confirm they’ve added you to their client list.
- Ask which due date applies to you: 15 May 2027, 31 March 2027 or 31 October 2026.
- Mention any older unlodged returns so your agent can plan around them.
- Start sending your records, including income statements, receipts, rental and investment documents.
- Note your payment date once your notice of assessment arrives.
Secure Your 15 May 2027 Deadline with TaxByte
At TaxByte, our CPA-qualified, ATO-registered team helps individuals, sole traders and businesses across Sydney, Melbourne, Brisbane, Adelaide, Perth, Canberra and Darwin. Contact us now and we’ll add you to our client list, confirm which lodgement date applies to you, and prepare a return that’s accurate rather than rushed. Already missed the cut-off? We’ll help you lodge quickly and keep penalties to a minimum.