How far back can the ATO audit my tax return in Australia?

Answer

The Australian Taxation Office (ATO) can generally audit your tax return for two to four years, depending on your entity type. This period can be extended indefinitely in cases of fraud, evasion, or tax avoidance schemes.

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

Was this helpful?

12 readers found this helpful

How it works in practice

Standard Amendment Periods

The Australian Taxation Office (ATO) has specific time limits within which it can review and amend a tax assessment. For most individuals and small businesses (excluding those with business income of $10 million or more), the ATO generally has two years from the date you receive your Notice of Assessment to initiate an audit or make an amendment.

Extended Periods for Larger Entities and Complex Cases

For larger businesses and other entities, the standard amendment period is four years. This longer period allows the ATO more time to scrutinize more complex financial affairs. It's crucial to understand that these periods are minimums and can be extended under specific circumstances.

Exceptions to the Rule

Critically, if the ATO suspects tax evasion, fraud, or believes an assessment resulted from a tax avoidance scheme, there is no time limit; they can audit and amend your return at any point in the future. Additionally, if you object to an assessment, the amendment period may be further extended.

Important exceptions

The standard two or four-year audit period does not apply in all situations. The ATO can amend a tax return indefinitely if they identify tax evasion, fraud, or believe a tax avoidance scheme was used. There are also specific rules for consolidated groups, partnerships, and trust structures, which may have different amendment periods.

Furthermore, if you lodge an objection against an assessment, the ATO's amendment period for that assessment is automatically extended.

What you should do now

  1. Keep all tax-related records, including receipts, invoices, and bank statements, for the entire amendment period (minimum two to four years).

  2. Understand the specific amendment period that applies to your individual or business tax situation to know your obligations.

  3. Seek professional tax advice if you have complex financial affairs, are involved in a tax avoidance scheme, or suspect fraud.

  4. Respond promptly and accurately to any communication or request for information from the ATO regarding your tax returns.

  5. If the ATO begins an audit, consider engaging a registered tax agent or lawyer to help you navigate the process and protect your rights.

Expert Notes

No expert notes have been added to this question yet.

People also asked

Explore highly relevant questions and get instant verified short answers.

Can't find an answer?
Submit your question below. If we publish an answer, it will appear in the "People also asked" section on this page.

We'll notify you if your question is answered. We won't use your email for anything else.