As the Australian Taxation Office (ATO) continues to ramp up its use of advanced data matching technology, both individuals and businesses are understandably keen to know how the ATO selects cases for review or audit and what behaviours or discrepancies might put them under the spotlight.
Understanding these processes can help you stay compliant and avoid unnecessary stress.
How you might find out you’ve been selected
The ATO’s data matching programs cross reference information from a wide range of sources including:
- banks
- employers
- property managers
- government agencies, and
- digital platforms
with the data you report in your tax returns.
If inconsistencies are detected, the ATO typically follows a structured process:
- Initial notification
The ATO may send you a letter or email requesting clarification or additional information. This is often the first sign that your return has been flagged. - ATO correspondence
You might receive formal notices via your myGov account or by post outlining the specific discrepancy and requesting a response within a set timeframe. - Audit invitation
In more serious cases, the ATO may invite you to participate in an audit. This could involve providing detailed documentation or attending an interview.
It’s important to respond promptly and thoroughly to any ATO correspondence. Ignoring these requests can escalate the situation and may result in penalties or further investigation.
Common triggers and red flags
The ATO uses data matching technology to identify a range of discrepancies and red flags that may prompt a review or audit.
Some of the most common triggers include:
- Unusual fluctuations in income
Large or unexplained changes in reported income compared to previous years. - Excessively large deductions
Claiming deductions that are significantly higher than expected for your business or industry. - Late or missing tax returns
Failing to lodge returns on time or at all. - Undeclared income
Not reporting income from all sources, such as rental properties, gig economy work or overseas earnings. - Mismatched data
Discrepancies between what you report and what third party sources (such as banks or employers) have provided to the ATO. - Inconsistent financial performance
Business results that are out of step with similar businesses in your industry. - Complex business structures
Use of multiple entities or trusts that may obscure the true financial picture. - Lifestyle not supported by income
Displaying a lifestyle that appears inconsistent with your reported after tax income. - Regular operating losses
Repeatedly reporting losses without a clear business rationale.
What happens next?
If your case is selected, the ATO will request documentation to verify the information you’ve provided.
This is your opportunity to clarify any misunderstandings or correct genuine errors. The ATO is required to follow strict privacy laws and your information is protected throughout the process.
How to stay ahead
- Maintain accurate records
Keep detailed, up to date financial records and ensure all income and deductions are properly documented. - Regularly reconcile accounts
Compare your reported figures with third party data (such as bank statements or property management reports). - Seek professional advice
If you’re unsure about your obligations or how to respond to ATO correspondence, consult a qualified accountant or tax adviser.
Being selected for an ATO data matching review or audit can be daunting, however understanding the process and knowing the common triggers can help you prepare and respond confidently.
By keeping your records accurate and transparent, you can minimise your risk of being flagged and ensure a smoother experience if you do come under review.