ATO & Tax Lawyers › Amended Assessment Disputes
ATO Amended Assessment Lawyers — Challenge the Assessment. Protect Your Position.
An ATO amended assessment raises additional tax, penalties, and general interest charge — sometimes for years of past returns. The tax is immediately due and payable even if disputed. A tax lawyer lodges a compelling objection, seeks a stay of collection where appropriate, and pursues the matter to the AAT or Federal Court if the objection is disallowed. Strict time limits apply — act immediately.
⚠ An objection to an ATO assessment must generally be lodged within 60 days of the date of the assessment. If an objection is disallowed, the taxpayer has 60 days to elect AAT review or Federal Court appeal. Missing these deadlines can permanently bar a meritorious challenge. Act immediately.
Amended Assessment Matters We Handle
Challenging ATO amended assessments — from objection to Federal Court.
Income Tax Amended Assessments
The ATO issues amended income tax assessments following audits, reviews, and data-matching programs. A lawyer challenges amended assessments that incorrectly disallow deductions, include non-assessable amounts, or are based on disputed asset valuations — preparing a detailed objection that addresses each ground of the amendment.
GST Amended Assessments
ATO GST audits frequently result in amended assessments that disallow input tax credits, reclassify transactions as taxable supplies, or include unreported GST. A lawyer challenges GST amended assessments through the Part IVC objection process and pursues AAT or Federal Court review if the objection is disallowed.
Capital Gains Tax Disputes
CGT disputes frequently arise from the ATO's valuation of assets at the time of acquisition or disposal, the availability of the CGT discount, main residence exemption eligibility, and the small business CGT concessions under Division 152 of the ITAA 1997. A lawyer challenges ATO valuations and CGT assessments with expert evidence and detailed legal submissions.
Penalty Remission Applications
Shortfall penalties are imposed where an amended assessment is issued because the taxpayer's tax position was incorrect. Penalty rates range from 25% to 75% of the shortfall. A lawyer prepares a comprehensive penalty remission application — identifying all available mitigating factors and seeking the maximum reduction in penalty.
GIC Remission Applications
General interest charge (GIC) accrues daily on unpaid ATO debts at a rate of around 11% per annum. A lawyer applies for GIC remission on the grounds that it is fair and reasonable to remit — for example, where the delay in paying was caused by the ATO's conduct, or where the taxpayer was under financial hardship.
Stay of Collection Pending Appeal
Where the disputed amount is unmanageable, a lawyer can apply to the Federal Court for a stay of the ATO's collection action pending the outcome of the objection or appeal. A stay application requires evidence that the collection would cause irreparable harm and that the appeal has reasonable prospects of success.
The Legal Framework
How amended assessments work under Australian tax law.
Amendment periods — s170 ITAA 1936
Under s170 of the ITAA 1936, the ATO can amend an income tax assessment within 2 years of the original assessment for individuals and small business entities, and within 4 years for other taxpayers. For GST, the amendment period is 4 years from the date of the relevant tax period. Where the Commissioner is of the opinion that fraud or evasion has occurred, there is no time limit on the amendment power. The amendment period runs from the date of the original assessment — so an audit commenced in year 3 can still result in amendments going back 4 years from the original assessment date.
Pay first, argue later — s14ZZM TAA 1953
Under s14ZZM of the TAA 1953, lodging an objection does not stay the ATO's obligation to collect the tax assessed. The amended assessment is immediately due and payable regardless of whether an objection has been lodged. Failure to pay results in GIC accruing and, if the debt remains unpaid, enforcement action — including garnishee orders, statutory demands, and wind-up applications. A lawyer can seek a payment arrangement with the ATO while the objection is on foot, and in appropriate cases can apply to the Federal Court for a stay of collection.
The objection process — Part IVC TAA 1953
The formal objection process under Part IVC of the TAA 1953 requires the taxpayer to lodge a written objection with the Commissioner within 60 days of the date of the assessment (or within the period allowed by the Commissioner if an extension is granted). The objection must state the grounds in full — objection grounds not raised in the objection generally cannot be raised in subsequent AAT or Federal Court proceedings. This makes the preparation of the objection critically important — it is the foundation of the entire dispute.
AAT review — s14ZZ TAA 1953
Under s14ZZ of the TAA 1953, if an objection is disallowed (in whole or in part), the taxpayer can elect within 60 days to have the matter reviewed by the Administrative Appeals Tribunal (AAT) or to appeal to the Federal Court. In the AAT, the burden of proof is on the taxpayer — under s14ZZO of the TAA 1953, the taxpayer must prove that the assessment is excessive. This is a higher standard than in general civil litigation, where the burden is on the party making the positive assertion. A lawyer understands the evidentiary requirements for establishing that an assessment is excessive and prepares the case accordingly.
Federal Court appeal — Part IVC TAA 1953
An appeal to the Federal Court under Part IVC of the TAA 1953 is a full hearing of the tax dispute — not a judicial review of the AAT's decision. The Federal Court hears the matter on its merits, with the taxpayer again bearing the burden of proving that the assessment is excessive. Federal Court tax proceedings are formal, expensive, and require specialist tax litigation expertise. Decisions of the Federal Court on questions of law can be appealed to the Full Federal Court, and (in special leave cases) to the High Court of Australia.
Small Taxation Claims Tribunal — disputes under $5,000
The Small Taxation Claims Tribunal (STCT) — a division of the AAT — provides a simplified, lower-cost forum for resolving tax disputes where the amount of tax in dispute is $5,000 or less. The STCT is designed for individuals and small businesses without legal representation, and proceedings are more informal than standard AAT proceedings. Where the disputed amount exceeds $5,000, the dispute is heard by the general division of the AAT — which is a more formal process with full evidentiary procedures.
How It Works
One request. A free amended assessment consultation.
Tell us the amount of the amended assessment, the grounds given by the ATO, when the assessment was issued, and any deadlines. A tax lawyer will contact you urgently.
Submit Your RequestDescribe the amended assessment
Tell us the amount of additional tax, penalties, and GIC raised; the grounds for the amendment; when the assessment was issued; and whether an objection has already been lodged.
Matched to a tax dispute lawyer
Your request is matched to a tax lawyer experienced in challenging ATO amended assessments — who understands the objection process, AAT proceedings, penalty remission, and Federal Court appeals.
Free urgent consultation
A tax lawyer contacts you for a free consultation — assessing the merits of a challenge, identifying all available grounds of objection, and advising on the strategy and cost for resolving the dispute.