If you disagree with an ATO assessment or another reviewable decision, an objection is the formal process for asking the ATO to reconsider it. It is not simply a complaint or a request to speak with another officer. A valid objection identifies the decision, states the grounds fully and explains the outcome sought.
Check that the decision carries objection rights
Many assessments, amended assessments, private rulings and penalty decisions can be challenged through the objection process. Some administrative decisions follow a different review or remission pathway. The notice should explain your rights, and the ATO publishes guidance about decisions to which you can object.
Do not treat informal discussion as a substitute for an objection. An officer may be willing to correct an obvious mistake, but a conversation does not necessarily preserve a formal time limit.
Find the correct time limit
ATO objection periods are not all the same. Depending on the decision and the taxpayer, the period can range from 60 days to two or four years. The following is a guide, not a complete statement of every rule:
| Type of decision | Typical timing issue |
|---|---|
| Income tax assessment or amendment | The period is commonly two or four years from when notice of the assessment is given, depending on the applicable amendment period. |
| Many other reviewable decisions | A 60-day period may apply from when notice of the decision is given. |
| Private ruling | Special timing rules apply and can interact with the relevant return or assessment. |
Read the review-rights section of your notice and check the current ATO guidance for your particular decision. Calculate from when the notice was given, not from when you eventually opened the envelope or decided to seek help.
If the deadline has passed
You may lodge the objection with a written request for an extension of time. Explain the delay, what you did once you became aware of the issue, the circumstances affecting you and why the objection has merit. Include supporting evidence where it exists.
An extension is not automatic. The safest course is still to act within the original period wherever possible.
State your grounds fully
Your grounds are the factual and legal reasons the decision is wrong. They should address the actual basis of the ATO's decision rather than repeat that the result feels unfair. A useful structure is:
- Identify the decision and the parts disputed.
- Set out the relevant facts in a clear chronology.
- Explain the tax treatment you say follows from those facts.
- Address the ATO's contrary reasoning.
- State the precise amendment or other outcome requested.
Grounds matter because later review is usually built on the case advanced at objection. New grounds may require permission. Put forward the complete case you can support, not a placeholder intended to be filled in later.
Connect evidence to each proposition
An objection is stronger when every material fact points to a document: contracts, invoices, bank statements, valuations, working papers, correspondence or contemporaneous advice. Label the attachments and refer to them in the grounds. Explain any gaps rather than leaving the decision-maker to guess.
The taxpayer generally carries the burden of establishing that the assessment is excessive and what the correct amount should be. That makes a coherent calculation just as important as criticism of the ATO's figure.
What happens to the debt while you object?
Lodging an objection does not automatically defer payment or stop interest. The disputed liability can remain payable while the objection is considered. Payment arrangements, deferral requests and recovery issues need to be dealt with separately.
If cash flow is a concern, address it early. Do not assume the objections team is also managing the debt account.
After the objection decision
The ATO will allow the objection in full, allow it in part or disallow it. If you remain dissatisfied, the objection decision generally explains how to seek independent review in the Administrative Review Tribunal or appeal to the Federal Court.
Those forums have different procedures, costs and approaches to evidence and legal issues. The quality of the objection record can materially affect the next stage, so the first formal document deserves care.
Before lodging
Confirm the deadline, use the approved lodgment channel, make the requested outcome measurable and keep a complete copy with evidence of lodgment. If penalties or interest are also involved, identify whether you are disputing the basis of the charge, seeking remission as a matter of discretion, or doing both through the appropriate processes.
Sources
Frequently asked questions
How long do I have to object to an ATO decision?
It depends on the decision. Periods can range from 60 days to two or four years. Check the review-rights section of the notice and the current ATO guidance for your specific decision.
Can I object after the deadline?
You can ask the ATO for an extension of time when lodging the objection. The request should explain the delay and why the objection should still be considered, but an extension is not guaranteed.
Do I have to pay the tax while an objection is underway?
The liability does not automatically pause when you object, and interest can continue. Payment, deferral and recovery arrangements should be addressed separately with the ATO.
What if the ATO disallows my objection?
The objection decision generally sets out rights to seek review in the Administrative Review Tribunal or appeal to the Federal Court, subject to the applicable requirements and time limit.