When Gambling Winnings ARE Taxable in Canada

The rule, and the exception nobody explains properly

The general position is simple and well settled: gambling winnings in Canada are a windfall, not income. Nothing to declare, nothing to pay. Paragraph 40(2)(f) of the Income Tax Act closes the other door too, keeping a gambling gain outside the capital gains rules.

The exception is where almost every article stops being useful. Winnings become taxable when gambling is carried on as a business rather than played - taxed as business income under sections 3 and 9 of the Act. What almost nobody explains is how astonishingly hard that is to trigger.

Duhamel: what it actually took to lose the argument

Jonathan Duhamel won the World Series of Poker Main Event in 2010, taking just under nine million US dollars, and played poker at the highest level for years afterwards. The Canada Revenue Agency argued he was carrying on a business and taxed him on his 2010 to 2012 winnings.

On 21 June 2022 the Tax Court of Canada disagreed. Justice Lafleur held that the winnings were not to be included in his income, and the judgment upheld a long line of case law setting an exceptionally high bar.

The reasoning is the useful part. Duhamel funded his play from savings built up during years of full-time work, rather than running it as a self-sustaining commercial operation. The court looked at the structure around the activity, not the size of the win. Nine million dollars did not make it a business.

What the courts actually weigh

The test is not a checklist, and anyone presenting one is overselling it. But the factors that recur in the case law are consistent enough to be worth knowing.

• Whether the game involves enough skill for a system to produce a reliable expectation of profit, rather than an element of chance dominating the outcome.
• Whether the activity is organised in a businesslike way - records, bankroll management, a system operated consistently rather than intuitively.
• Whether it is the taxpayer's sole or principal source of income, and whether it sustains itself rather than being funded from elsewhere.
• Intention: whether the person set out to make a living from it, judged by conduct rather than by what they say afterwards.
• How the courts read the whole picture, because no single factor decides it. Duhamel had several of these and still won.

What this means in practice

For a recreational player - which includes almost everyone reading this, including people who win large amounts - winnings are not taxable and there is nothing to report. That remains true for slots, table games, sports betting and lotteries alike, and whether the site is provincially regulated or offshore.

If you genuinely play professionally, the position is fact-specific and expensive to get wrong in either direction. That is a conversation with a Canadian tax professional, not with a comparison site.

And one thing that catches people regardless: the money stops being a windfall the moment it starts earning. Interest on the balance is taxable interest, and gains on anything you invest it in are taxable gains. The win is untaxed; what it earns afterwards is not.