Declared income $42,018. Chip buy-ins approaching $500,000. The burden was hers, and the WeChat messages were gone.
Your client earns $42,000 a year. The ATO has casino records showing she bought almost half a million dollars in chips at Crown in a single year. Where did the money come from?
That is the question in Cai [2026] ARTA 1224.
What happened
The ATO has the power to compel third parties, including casinos, to hand over their records (s 353-10). It sent notices to Crown Melbourne, The Star Sydney and The Star Gold Coast. The records showed buy-ins at Crown approaching $500,000 in a single calendar year, losses of almost $250,000 [79], and $280,000 deposited at The Star Gold Coast in a single trip [80-81].
Mrs Cai had declared taxable income of $42,018 for FY2017, all from wages at a grocery store. The ATO amended her assessment, adding $545,376 in assessable income. It called its own figure “conservative” because it had excluded further gambling activity and had not assessed amounts for personal living expenses [150].
Mrs Cai also told the Tribunal that she had received rental income of $950 per week during FY2017. It was not in her return [9]. She was contesting an assessment for undisclosed income while revealing more of it.
The evidence problem
Mrs Cai’s defence was straightforward: two friends had lent her casino chips and cash. The three gambled together and shared wins and losses [17]. Under s 14ZZK of the TAA 1953, the burden was on her to prove the assessment was excessive and what it should have been [55-56]. She could not.
There were no records. The friends said they tracked lending via WeChat messages on their phones. Mrs Cai had changed phones and the messages were gone [18, 89]. The chips and cash the friends lent her were never documented in writing.
The witnesses undermined themselves. Ms Wu’s written statement said the debts had been “fully repaid years ago.” At the hearing she said Mrs Cai still owed her “over $200,000” [90]. Ms Zhu could not give even a “ballpark” of total lending [98].
The only loan the Tribunal could verify was $26,000, a bank transfer marked “pay borrowed money back” [96, 100(h)]. It came nowhere near explaining the casino activity. The Tribunal affirmed the assessment and the 50% recklessness penalty [170, 173-174].
Why this matters
The ATO obtains records from casinos. If your client’s gambling does not match their declared income, the ATO will treat the gap as undisclosed income and issue an amended assessment. The burden then falls entirely on your client to prove it wrong.
“My friends lent me the money” is not inherently implausible. But it needs contemporaneous documentation, not WeChat messages on phones that no longer exist. If your clients gamble, the source of funds needs to be documented and traceable before the ATO comes knocking.
General information only. This note was accurate when written. The law may have changed since and the note is not updated. It is not legal or tax advice, does not take account of your circumstances and must not be relied upon as a substitute for advice on your own matter. If the issue is live for you or your client, email arda@nortonquaytaxlaw.com.au for advice on the current position.