1. Mismatched Income Data
The ATO cross-checks your reported income against data from banks, payment processors, government agencies, and other third parties. Discrepancies—such as underreporting interest, dividends, or marketplace sales—are a common audit trigger.
Tip: Reconcile your reported income with all available third-party statements before lodging.
2. Unusually High Deductions
Large or inconsistent deductions compared to industry benchmarks raise red flags. This includes unusually high home-office claims, motor vehicle expenses, or repairs and maintenance that don’t match the scale of the business.
Tip: Always retain documentation and be ready to justify deductions with evidence.
3. Cash-Heavy Business Models
Restaurants, cafés, retail stores, and trades that regularly deal in cash are closely monitored. Unexplained discrepancies between reported sales and expected industry averages can prompt ATO queries.
Tip: Deposit all cash takings into business bank accounts and maintain daily sales records.
4. GST Reporting Inconsistencies
If your BAS figures don’t align with your income tax return, the ATO will notice. Mismatches often occur when accounting methods differ between GST and income tax reporting.
Tip: Ensure consistency in how income and expenses are coded in your accounting system for both BAS and annual tax reporting.
5. Late or Non-Lodgement
Consistent delays in lodging returns or failing to lodge at all are major compliance red flags. The ATO views this behaviour as a possible indicator of poor record-keeping or financial distress.
Tip: Engage a tax agent to access extended lodgement deadlines and avoid penalties.
6. Industry Benchmark Outliers
The ATO publishes performance benchmarks for various industries. Businesses that fall far outside these benchmarks—especially with lower-than-expected profit margins—may face additional scrutiny.
Tip: Review ATO benchmarks for your industry annually to see how your figures compare.
Protect your business from unnecessary ATO attention
We can review your tax position, align your records with ATO expectations, and lodge with confidence.
Book a Compliance Review Speak to an ExpertFAQs
Does an audit mean I’ve done something wrong?
Not necessarily. Audits can be random or triggered by data mismatches or anomalies. The key is to have proper records ready.
How far back can the ATO audit?
Generally, the ATO can review the last two to four years, but this can extend to more years if they suspect fraud or evasion.
What’s the best way to prepare for an audit?
Maintain complete, organised records and ensure that all claims are backed by evidence. A pre-lodgement review by a tax agent can reduce audit risk.
Can Taxopia help if I’m already under audit?
Yes—we can liaise with the ATO on your behalf, prepare supporting documentation, and guide you through the process.
Need help reducing your audit risk?
Work with a registered tax agent who understands ATO audit triggers and how to stay compliant.
Book a Review Today Ask an ExpertGeneral information only. This article is not financial or tax advice. Consider your circumstances and seek advice from a registered tax agent or qualified professional.