An ATO audit is a formal, wide-ranging investigation of your financial records and tax position. An ATO review is a targeted, desk-based check of a specific item in your return. An objection is a formal legal mechanism you lodge to dispute an ATO assessment or decision. Each carries different obligations, timelines, and consequences for SMEs and privately owned groups.
We work with founder-led businesses and high wealth individuals who receive ATO correspondence every week. The label on the letter matters far less than understanding what the ATO is empowered to do at each stage, and what your response options are.
What Is an ATO Review?
An ATO review is a risk-based check. The ATO has identified something in your return, your Business Activity Statement, or your tax position that sits outside normal patterns for your industry or income band. They want to test whether it holds up, and they do so from their desk before committing resources to a full investigation.
In practical terms, a review typically involves a written request for specific documents: invoices supporting a deduction, records for a particular expense category, or an explanation of a reported figure. The scope is deliberately narrow. The ATO asks one targeted question about one reported figure, leaving the rest of your financial history untouched.[1]
Reviews are common. The ATO runs thousands of them each year as part of its risk-differentiation framework, targeting returns that fall outside expected parameters. Receiving one does not mean the ATO suspects fraud or serious non-compliance. It means an algorithm or an analyst flagged a data point for verification.
The risk that SMEs and sole traders consistently underestimate: a review can escalate. If your response is incomplete, your records are inconsistent, or the ATO finds something unexpected, the matter moves from a narrow desk query to a formal audit. Your first response to a review is therefore not administrative housekeeping. It is a strategic decision.[1]
For a deeper look at how the ATO selects who to scrutinise in the first place, see our analysis of 5 ways the ATO selects who to audit.
What Is an ATO Audit?
An ATO audit is a formal investigation. The ATO is no longer asking a clarifying question. It is examining whether your tax position across one or more years is correct, and it has broad statutory powers to compel the production of documents, access premises, and issue formal notices.[2]
Audits are broader in scope than reviews, often spanning multiple income years and multiple tax types simultaneously. Where a review might request records for a single deduction, an audit will request bank statements, contracts, payroll records, loan accounts, and internal financial reports. The ATO may also contact third parties, including your bank, your customers, and your suppliers, without notifying you first.
The four main types of ATO audit activity are:
- Income tax audits – examining whether assessable income has been correctly reported and deductions legitimately claimed.
- GST audits – verifying that GST collected and input tax credits claimed are accurate and supported by valid tax invoices.
- Employer obligation audits – covering superannuation guarantee, PAYG withholding, and fringe benefits tax.
- Specific risk audits – targeting known risk areas such as transfer pricing, thin-capitalisation, or anti-avoidance provisions under Part IVA of the Income Tax Assessment Act 1936.
The ATO’s audit process carries formal timelines, statutory amendment periods, and the possibility of shortfall penalties and general interest charges. Understanding the full sequence before you receive your first audit notice is the difference between a contained matter and a protracted dispute. Our ATO audit process guide walks through each stage in detail.
What Is an ATO Objection, and When Do You Lodge One?
An objection is your formal legal right to dispute an ATO assessment, amended assessment, or private ruling. It is governed by Part IVC of the Taxation Administration Act 1953 and is the first step in the statutory dispute resolution pathway.[3]
You lodge an objection when the ATO has issued a decision you believe is wrong: an amended assessment following an audit, a penalty determination, a private binding ruling you disagree with, or a decision on a claim for a refund. The objection must be lodged in writing, set out the grounds on which you contend the decision is incorrect, and be supported by evidence.
Objections are time-limited. For most assessments, you have 60 days from the date of the notice to lodge. For some categories, the period is four years. Missing the deadline forfeits your right to object without the ATO’s discretionary consent, which is not guaranteed.
If the ATO disallows your objection, you have a further right to appeal to the Administrative Review Tribunal or the Federal Court of Australia. This is where the stakes escalate significantly, and where the quality of your original objection determines the strength of your position in any subsequent proceeding.
Our detailed guide on 5 things to include in an ATO objection covers the specific elements that determine whether an objection succeeds or fails at the first stage.
How an Audit, a Review and an Objection Fit Together
These three mechanisms sit at different points in the ATO’s compliance and dispute continuum.
A review is the ATO’s early-stage verification tool. An audit is its formal investigation power. An objection is your formal response right after the ATO has made a decision you contest.
In practice, the sequence often runs: review, then audit if the review raises concerns, then amended assessment, then objection if you dispute the assessment. But the ATO can also open directly with an audit if it already has evidence of non-compliance. And you can lodge an objection to a decision made without any prior audit, for example a private binding ruling or a penalty notice issued after a voluntary disclosure.
Understanding where you sit in this sequence determines your options, your timelines, and the strategic weight of every document you produce. For privately owned groups and high wealth individuals with complex structures, the stakes at each stage are amplified. A misstep in a review response can foreclose objection arguments that would otherwise have been available.
We have also written about the six stages of a tax dispute for those who want to map the full journey from initial ATO contact through to resolution.
Why the Label on the ATO Letter Is Not the Whole Story
The ATO’s correspondence does not always announce its intentions precisely. A letter headed “review” can carry information-gathering powers that feel indistinguishable from an audit. A “compliance check” can be the precursor to a formal audit notice issued weeks later.
What matters is the specific powers the ATO is exercising, the documents it is requesting, and the statutory basis for those requests. Responding without understanding that basis is one of the most common and costly mistakes SMEs and sole traders make.
Our founder, Nitin Saby, spent years inside the ATO as a Tax Counsel Network Law Interpretation Specialist and Tax Specialist Executive before moving to a Tax Principal role at a top-10 CAANZ firm. That insider knowledge of how the ATO frames its correspondence, what its internal risk signals look like, and how compliance matters are escalated internally is precisely what we bring to every dispute engagement.
If you are facing ATO correspondence of any kind and are unsure of your position, the right move is to get specialist advice before you respond. Contact us to discuss your situation.
Frequently Asked Questions
The Difference Between an Audit, a Review and an Objection: What Each Stage Means for You
An ATO review is a targeted, desk-based check of a specific item in your tax return or BAS. An audit is a formal, broad-scope investigation that can span multiple years and tax types, and carries compulsory information-gathering powers. A review can escalate into an audit if your response raises further questions or your records are inconsistent.
What is an audit objection?
An objection is a formal written dispute lodged under Part IVC of the Taxation Administration Act 1953. You use it to contest an ATO assessment, amended assessment, penalty, or ruling you believe is incorrect. The objection must state specific grounds and be supported by evidence. If the ATO disallows it, you can appeal to the Administrative Review Tribunal or the Federal Court.
What is an audit review?
In the ATO context, “audit review” is not a distinct formal category. The two terms describe separate processes: a review is a preliminary verification check, and an audit is a formal investigation. Some taxpayers use “audit review” loosely to mean the ATO’s examination of their affairs, but understanding the precise distinction between the two matters because each carries different obligations and consequences.
What are the four main types of audits?
In the ATO context, the four main audit types are: income tax audits (covering assessable income and deductions), GST audits (covering tax collected and input tax credits claimed), employer obligation audits (covering superannuation guarantee, PAYG withholding, and fringe benefits tax), and specific risk audits targeting areas such as transfer pricing, thin-capitalisation, and anti-avoidance provisions.
[1] ATO review vs audit analysis informed by Aptum Legal’s published overview of ATO review and audit processes, including escalation triggers and scope distinctions. https://aptumlegal.com.au/blog/ato-review-vs-audit-whats-the-difference-and-when-does-one-become-the-other/
[2] Audit scope, powers, and document categories informed by published guidance on audit and review engagement differences across income tax, GST, and employer obligations. https://assurancedimensions.com/audit-and-review-engagements-3-key-differences/
[3] Objection rights, timelines, and the Part IVC statutory pathway informed by published ATO guidance and the Scribd settlement of audit objections process document. https://www.scribd.com/document/396488686/Audit-Objection