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Common tax return mistakes triggering audits

Published July 18, 2026 at 9:03 PM UTC

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As tax season progresses, the Australian Taxation Office (ATO) is intensifying its scrutiny of individual and business tax returns. With the use of sophisticated data-matching technology, the ATO now cross-references over 2.7 billion data points annually, including information from banks, employers, and digital platforms. This digital oversight means that even minor discrepancies can lead to an official request for information, which serves as a precursor to a formal audit. Taxpayers are encouraged to prioritize accuracy over speed to avoid the stress and potential penalties associated with these reviews.

The most frequent errors identified by the ATO involve the incorrect claiming of work-related expenses, inflated rental property deductions, and the failure to declare all sources of income. Many taxpayers mistakenly assume that copying and pasting claims from previous years is acceptable, but the ATO warns that such patterns often trigger an immediate review. Furthermore, the rise of the gig economy and side hustles has led to increased oversight of undeclared earnings from platforms like Uber, Airbnb, and various freelance marketplaces.

To minimize the risk of an audit, experts emphasize the importance of maintaining comprehensive records. For work-from-home expenses, this includes keeping a diary or timesheet to substantiate hours worked, alongside proof of actual costs incurred. The ATO also notes that while many mistakes are genuine, they are still subject to correction, which can result in amended assessments, interest, and additional tax liabilities. Taking the time to wait for pre-filled data to be finalized before lodging can significantly reduce the likelihood of needing to amend a return later.

Ultimately, the responsibility for the accuracy of a tax return rests with the individual, regardless of whether a tax agent is used. While professional advice can provide confidence and help identify legitimate deductions, taxpayers must ensure they have the evidence to support every claim. As the ATO moves away from the more lenient, pandemic-era compliance approach, maintaining clear, verifiable documentation has become the most effective defense against unwanted scrutiny.