Can I amend my tax return after lodging in Australia?

Answer

Yes, you can amend your tax return in Australia after lodging if you discover errors or omissions. The Australian Taxation Office (ATO) allows corrections, typically within two to four years, depending on your tax situation.

Australian Taxation Office (ATO)
Last Updated:May 5, 2026

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How it works in practice

Understanding Tax Return Amendments

After lodging your income tax return in Australia, you may discover a mistake or realise you've omitted some income or deductions. Fortunately, the Australian Taxation Office (ATO) provides a clear process for amending your return. This ensures that your tax assessment is accurate and reflects your true financial position, preventing potential penalties for underpayment or allowing you to claim a correct refund.

How to Amend Your Return

The most common method for amending your tax return is directly through the ATO's online services via MyGov. You can also amend through a registered tax agent, who can manage the process on your behalf. Alternatively, you can download and mail a paper amendment form. When lodging an amendment, you will need to provide details of the changes and the reasons for them, along with any supporting documentation.

Important exceptions

While you can generally amend your tax return, there are specific time limits. For most individual taxpayers, you have two years from the day after you receive your notice of assessment to request an amendment. For small businesses, this period is often four years. If you are an individual and the amendment would result in a lower tax liability (e.g., claiming a refund), the two-year limit applies. If the amendment would result in a higher tax liability (e.g., unreported income), the ATO may amend your return at any time. Complex cases or specific tax entities may have different rules.

What you should do now

  1. Review your original tax return and identify all errors, omissions, or new information.

  2. Gather all necessary supporting documents, such as new receipts, income statements, or financial records.

  3. Access the ATO's online services via MyGov or contact your registered tax agent to initiate the amendment process.

  4. Clearly detail all changes, providing precise figures and reasons for each adjustment to your original return.

  5. Lodge the amended return and keep thorough records of your original return, the amendment request, and all supporting documentation.

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