The ATO has sophisticated data matching with online platforms. Here's what triggers scrutiny and how to protect yourself.
The ATO receives transaction data from eBay, PayPal, Stripe, and other payment processors through its data matching program. This program covers millions of transactions per year and uses automated systems to compare declared income against known payment flows. If you receive $30,000 from eBay but only declare $15,000 in income, the system will flag the discrepancy.
Common triggers include: undeclared income (the ATO can see payments you received), unexplained wealth (lifestyle inconsistent with declared income), tip-offs (from disgruntled partners, competitors, or members of the public), random selection (the ATO audits a sample of returns each year), and unusual deduction patterns.
The ATO contacts you (usually by letter) requesting information about your income and expenses. You'll need to provide bank statements, platform reports, expense receipts, and any other business records for the period in question. The ATO expects records going back at least five years.
Comprehensive records are your best defence. If the ATO queries your income and you can demonstrate that your declared income matches your platform reports, bank deposits, and accounting records, the audit ends quickly. Without records, the ATO will estimate your income — usually unfavourably. See our ATO record keeping guide and reseller tax guide.
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