The right process depends on the return type, how you lodge, and whether you prepare it yourself or use a registered tax agent. Get it wrong and you may lodge an invalid return or sign without the authority to do so.
For 2023-24, ATO statistics show 62.1% of individuals lodged through agents and 37.5% through myTax. This guide covers paper returns, myTax, agent declarations, electronic approval, common errors, and getting copies.
Key Takeaways
- Sign only in the declaration block of the current ATO form.
- myTax uses an online declaration, not a handwritten signature.
- Company, trust, partnership and SMSF returns have their own signatories.
- Keep a complete copy and check current ATO instructions before lodging.
Where to Sign on an Australian Tax Return
Find the declaration and signature block
On the paper Tax return for individuals 2026 (NAT 2541-06.2026), the declaration sits on page 11 under "Taxpayer's declaration". The form states: "All taxpayers must sign and date the declaration below." It adds: "For your tax return to be valid you must sign below." Fill in the "Date" field as day, month, year.
Layouts change between tax years, so confirm the page against the form for your year before signing.
By signing, you confirm that:
- the information and attachments are true and correct
- all income, including net capital gains, is disclosed
- required supplementary sections are completed or attached
- you hold the necessary records, or will have written evidence for deductions within a reasonable time after lodging
A signature doesn't replace completing the income, deduction or supplementary sections. It vouches for them.
How the signature differs by return and filer
For an individual paper return, sign in the declaration field, add the date, and make sure the signer is the taxpayer named on the return. Don't sign schedules or attachments in place of the main declaration.
Entity returns use different signatories on the 2026 forms:
| Return | Who signs | Location |
|---|---|---|
| Company | Public officer | Page 12 |
| Trust | Trustee; for a corporate trustee, the public officer, or an ASIC-listed director if there is no public officer | Page 20 |
| Partnership | A partner | Page 16 |
| SMSF | All trustees or directors of the corporate trustee must authorise it | Section K |
For SMSFs, document the authorisation in the fund's records. Check the instructions for your entity before anyone signs.
Do You Need to Sign Every Australian Tax Return?
Paper returns, myTax, and tax-agent lodgements
Every method requires a declaration, but the mechanism differs.
- Paper: handwritten signature and date.
- myTax: select Calculate, review the declaration, tick the box to agree, then select Lodge. You don't print and sign a PDF.
- Registered tax agent: the agent needs a written client declaration for each approved form.
Under ATO client declaration rules, the declaration must identify the form, confirm the information is true and correct, and authorise lodgement. It can arrive by email, fax or paper.
A scanned handwritten signature isn't required for a compliant emailed declaration, but electronic communications need consent and reasonable identification. A phone call alone isn't enough, and ongoing authority doesn't replace a declaration for each form.
The ATO's own example shows how this goes wrong. A client's email that doesn't sufficiently identify the return is inadequate. Name the year, or refer to an earlier email by date.
Rules on electronic approval depend on your method, so don't assume any return can or can't be signed electronically.
Situations requiring extra care
The person signing isn't always the person whose income is reported.
- Minors: ATO Community staff guidance from August 2023 says a parent may sign a child's return without sending proof of parenthood. That's staff guidance, not a form instruction.
- Deceased estates: the legal personal representative usually lodges. On paper, write "DECEASED ESTATE" at the top and sign your name "on behalf of" the deceased. Don't use their myGov or myTax.
- Taxpayer overseas: a friend or family member needs power of attorney to sign for you.
Never sign for another taxpayer or entity unless you hold legal authority and the ATO process allows it.
How to Sign and Lodge Your Return Correctly
Pre-signing review checklist
Check these before you sign:
- Name, TFN and contact details
- Correct tax year
- All income and deductions, matched to your records
- Bank account details for any refund
- Schedules and attachments
- Date and signatory details in the declaration
Resolve gaps first. The signature is not the moment to discover missing income.
Lodgement and confirmation
Post a paper return in the supplied envelope, or mail it to the Australian Taxation Office, GPO Box 9845, followed by your capital city and postcode. From overseas, use GPO Box 9845, SYDNEY NSW 2001, AUSTRALIA.
For 2026, self-lodgers have until 11:59 pm local time on Monday 2 November 2026. Registered agents often have later schedules.
myTax sends an email receipt confirming the ATO received your return. The ATO aims to issue notices of assessment within about 12 business days for online and agent returns and 50 business days for paper.
Those timeframes are targets, not guarantees. Some earlier ATO guidance quoted 10 business days, so confirm current times on the ATO website.
Keep a complete copy
Three documents serve different purposes:
- The return copy: what was prepared and lodged
- Proof of lodgement: a myTax receipt or agent confirmation
- Notice of assessment: the ATO's outcome after processing
In ATO online services through myGov, go to Tax, Lodgments, Income tax, History, then View details. Print or save the "Customer Copy Only". That's a lodged copy, not a handwritten original. Ask your agent separately for your signed or electronic client declaration.
Individual returns from 2010 onwards are available online. For 1997-2009, contact the ATO.
The ATO generally expects you to keep individual tax evidence for five years from lodgement, and longer for some assets, capital gains and disputes.
Common Signing Problems and What to Do Next
Missing, incorrect, or unauthorised signatures
The 2026 form makes your signature a condition of validity. It doesn't state a penalty or a fix-by date, so don't assume either. Blank declarations, the wrong field, a wrong date or the wrong signer all need attention.
If the return is already lodged, don't alter it yourself. Contact your agent or the ATO on 13 28 61 (8 am to 6 pm, Monday to Friday).
To amend, select Manage tax returns, then Amend in ATO online services. Wait until the original return is processed first. Signed amendment letters need a dated declaration.
Forgetting a signature differs from unauthorised lodgement. The Tax Practitioners Board terminated an agent company in October 2026 over client-verification failures, including lodging without authorisation.
When professional assistance is worthwhile
Consider a registered tax agent for:
- business or investment income
- foreign income Australian residents must declare
- deceased estates
- company, trust, partnership or SMSF returns
- amendments
- doubt about who may sign
None of these legally requires an agent. Check registration on the Tax Practitioners Board register first. BAS-agent registration alone doesn't cover income tax returns.
Where foreign income or multi-country operations are involved, VJM Global provides international taxation expertise and compliance support, including cross-border tax guidance.
Check current information
Rules and forms change each year. Confirm the current ATO form, declaration instructions and electronic lodgement guidance before you sign. This article is general information, not tax advice.
Frequently Asked Questions
Where should I sign on my tax return?
Sign in the "Taxpayer's declaration" on the current paper ATO form (page 11 for 2026). myTax and agent-lodged returns use different approval steps.
Do I need to sign tax returns?
Yes, in some form. Paper returns need a signature, myTax needs a ticked declaration, and agents need a client declaration. Entity returns have their own signatories.
How do I get my signed tax return?
Download a "Customer Copy Only" from ATO online services, or ask your agent for the return and your declaration. A notice of assessment is a separate document.
Can I sign my Australian tax return electronically?
It depends on your method. myTax and qualifying agent declarations are electronic. Typing your name onto a PDF isn't automatically valid.
What happens if I forget to sign my tax return?
The form says signing is needed for validity. If unlodged, sign before sending. If already lodged, contact the ATO or your agent for correction steps.
