RBizz Corporate Accountants - Resources #ATO

Amending a Prior Year Tax Return: When and How It's Done

Fri, 17 Jul 2026 12:01:41 +1000

Amending a Prior Year Tax Return: When and How It's Done

Tax season has a way of surfacing things after the fact. A return gets lodged, and a few weeks later a missed deduction, an overlooked income source, or a data entry error comes to light. It's a more common situation than most business owners expect — and in most cases, it's entirely fixable.

The key is understanding when an amendment is possible, how the process works, and what it means for your outstanding tax position either way.

When You Can Amend a Return

Businesses and individuals are generally able to request an amendment to a previously lodged tax return within a set time limit, which depends on the entity type:

Individuals and small businesses typically have a standard amendment period of a set number of years from the date the original notice of assessment was issued.
Larger businesses may have a different (often shorter) amendment period, depending on their classification.
Certain circumstances — such as fraud or evasion — can extend the period the ATO can review or amend a return, in either direction.

Because these time limits vary and are periodically reviewed, it's worth confirming your specific amendment period with a registered tax agent before assuming a correction is (or isn't) still possible.

Common Reasons Businesses Amend a Return

A deduction was missed — often identified during a later review, or after realising an expense category (like depreciation or home office costs) wasn't fully claimed.

Income was left out — a forgotten invoice, an overlooked bank interest amount, or income from a source not initially considered taxable.

A data entry or calculation error — simple mistakes in figures transferred between accounting software and the return itself.

A change in classification — for example, realising an amount treated as a loan should have been treated as income, or vice versa.

Updated information from a third party — such as a corrected income statement, dividend statement, or trust distribution advice received after lodgment.

How the Amendment Process Generally Works

Identify the specific error and the correct treatment. This usually involves reviewing the original return alongside supporting records to confirm exactly what needs to change.

Lodge an amendment request, either through a registered tax agent or directly via the ATO's online services, specifying the item being corrected and the reason.

Wait for the amended assessment. The ATO will issue a new notice of assessment reflecting the correction, which may result in additional tax payable, a refund, or no change to the amount owed.

Address any resulting balance. If the amendment increases the amount owed, interest may apply from the original due date — but voluntarily correcting the error is treated very differently to being caught out in a review, both in terms of ATO approach and any penalty consideration.

Why Acting Early Matters

Amendments initiated voluntarily, before the ATO identifies the issue independently, are generally viewed far more favourably than errors uncovered through a compliance review. Voluntary disclosure can also reduce or eliminate penalties that might otherwise apply, even where interest on any additional tax is still payable.

Waiting doesn't reduce the amount owed — it usually increases it, through accruing interest, and removes the goodwill that comes from raising the issue proactively.

What to Do If You Think a Past Return Needs Correcting

If something's come to light — a missed deduction, an income discrepancy, or simply uncertainty about whether a prior return was handled correctly — it's worth a review before assuming it's too late or too complicated to fix. In most cases, it's neither.

RBizz reviews prior-year returns and manages the amendment process directly with the ATO — schedule a free consultation if something doesn't look quite right.

ATO Audit Triggers: What Increases Your Risk in 2026

Wed, 15 Jul 2026 19:58:35 +1000

ATO Audit Triggers: What Increases Your Risk in 2026

Very few businesses get audited purely at random. The ATO uses data matching, industry benchmarking, and automated flags to identify returns that warrant a closer look — and understanding what raises that flag is one of the simplest ways to reduce your risk.

Being audited isn't necessarily a sign that something's wrong. But it is time-consuming, and businesses with clean, well-substantiated records go through the process far more smoothly than those without. Here's what typically increases audit risk, and how to stay on the right side of it.

Common Audit Triggers

1. Figures That Sit Outside Industry Benchmarks

The ATO publishes small business benchmarks for many industries, comparing reported income and expenses against typical ranges for similar businesses. A return that sits well outside these ranges — unusually low profit margins, unusually high expense ratios — can attract closer attention.

2. Inconsistencies Between Reports

If your BAS figures, income tax return, and payroll reporting (via Single Touch Payroll) don't align with each other, it creates a visible inconsistency the ATO's systems are specifically designed to catch.

3. Large or Unusual Deductions Relative to Income

A significant jump in claimed deductions — particularly ones without clear substantiation — is a common trigger, especially when it isn't matched by a corresponding change in revenue or business activity.

4. Cash-Heavy Business Models

Businesses in industries where cash transactions are common (hospitality, trades, personal services) face additional scrutiny, simply because underreporting is statistically more common in these sectors. This doesn't mean cash businesses are assumed to be non-compliant — it means recordkeeping matters even more.

5. Related-Party Transactions

Loans between a company and its directors or shareholders, family trust distributions, and related-party rent or service arrangements are all closely monitored, particularly where the terms don't reflect an arm's-length arrangement.

What Reduces Your Risk

None of these triggers mean an audit is guaranteed, and none of them should be avoided by simply not claiming what you're entitled to. The goal isn't to minimise legitimate deductions — it's to make sure everything claimed is properly substantiated.

Keep documentation for every deduction, not just a receipt but a clear business justification.
Reconcile BAS, payroll, and tax return figures against each other before lodgment, not after a discrepancy is flagged.
Document related-party arrangements formally, including loan agreements and market-rate justification for rent or services.
Lodge on time, consistently, even if the exact figures are still being finalised — amendments are far less disruptive than a pattern of lateness.
Have a second set of eyes review unusual years — a year with materially different figures from the one before is worth a proactive review, not just a lodgment.

If You Are Selected for Review

An ATO review or audit isn't automatically adversarial. Businesses with clear records, honest positions, and professional representation typically move through the process efficiently. The businesses that struggle are usually the ones without the paperwork to back up what they've claimed — not the ones who made an honest, well-documented judgment call that turned out to be scrutinised.

Confidence Comes From Preparation, Not Luck

The best defence against audit risk isn't avoiding attention — it's making sure that if attention comes, your records hold up without a scramble.

RBizz reviews client accounts with audit-readiness in mind year-round, not just at tax time — schedule a free consultation to check where your business stands.