How do I object to an ATO decision in Australia?

Answer

To object to an ATO decision, you must lodge a formal objection within the specified time limits, outlining your reasons and providing supporting documentation. The ATO will then conduct an internal review of your case.

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

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How it works in practice

Understanding the Objection Process

If you disagree with a decision made by the Australian Taxation Office (ATO), such as an assessment or a penalty, you have the right to lodge a formal objection. This process initiates an internal review where an ATO officer, independent of the original decision-maker, re-examines your case. The purpose is to ensure fairness and accuracy in the ATO's application of tax law to your circumstances.

Grounds for Objection

Your objection must clearly state the reasons why you believe the ATO's decision is incorrect and refer to relevant facts, evidence, and legal principles. You should provide all supporting documentation, such as financial records, correspondence, or expert opinions, to substantiate your claims. The ATO provides specific objection forms for different types of decisions, which help guide you through the required information.

Next Steps if Unsatisfied

After the ATO completes its internal review, they will notify you of their decision. If you remain dissatisfied, you have further avenues for external review. These include appealing to the Administrative Appeals Tribunal (AAT) or, in some cases, directly to the Federal Court. Pursuing these options typically involves stricter time limits and may incur legal costs.

Important exceptions

Not all ATO decisions can be formally objected to; some have specific review processes. Strict time limits apply for lodging objections, usually two or four years depending on the type of assessment, which can be extended only in limited circumstances. Objections must be made in the approved form, detailing specific reasons, and cannot be a general disagreement without supporting facts or law. Decisions related to certain administrative matters might have different review mechanisms outside the formal objection process.

What you should do now

  1. Understand the ATO decision you are disagreeing with and the specific reasons for it.

  2. Gather all relevant documents and evidence that support your position against the ATO's decision.

  3. Complete the appropriate ATO objection form, clearly stating your grounds for objection and attaching all supporting evidence.

  4. Lodge your formal objection with the ATO within the specified time limits for your type of assessment or decision.

  5. If the internal review outcome is unsatisfactory, consider options for external review, such as the Administrative Appeals Tribunal (AAT).

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