How does the Canada Revenue Agency decide if my online casino winnings are taxable income?

For the vast majority of Toronto players, the short answer is: no, your online casino winnings are not taxable. But the CRA's reasoning is worth understanding, because there's a real exception that applies to a small number of people.

The default rule — casual gambling is not a source of income

Lottery winnings of any amount are listed by the CRA as non-taxable, unless the prize can be considered income from employment, a business or property, or a prize for achievement. The same logic extends to casino-style gambling. Lottery and certain other winnings are non-taxable in Canada — however, if a taxpayer is in the business of gambling, the proceeds and losses are considered for income tax purposes.

The phrase "in the business of gambling" is doing all the heavy lifting here. Canadian tax law draws a firm line between a recreational player and someone whose gambling constitutes a genuine commercial activity. In the case of hobbies, neither amounts received nor expenses incurred are included in the income computation for tax purposes. Recreational gambling falls squarely into that category.

When winnings can become taxable — the "business of gambling" test

The CRA's own technical guidance, Income Tax Folio S3-F9-C1, covers the tax treatment of various receipts including gambling winnings, which do not readily come within any of the more usual categories of income. That folio, along with the CRA's internal audit manual, makes clear that the agency looks at whether gambling is a genuine commercial pursuit — not just a pastime. Factors that push someone toward "business" status include: operating with a high degree of system and structure, devoting substantial time to it, using specialized knowledge or skill to generate consistent profit, and treating it as a primary or supplementary source of livelihood. No single factor is decisive; the CRA looks at the full picture.

In practice, courts and the CRA have found very few individual gamblers to meet this threshold. Poker players who grind professionally are the most commonly cited example. Someone who plays slots or blackjack on a regulated Ontario platform — even frequently and with large wins — is almost certainly a recreational player in the CRA's eyes.

One important wrinkle: investment income on winnings is taxable

Even if your winnings themselves are non-taxable, any interest that you earn when you invest lottery or gambling winnings must be reported on your return. So if you withdraw $50,000 in winnings and put it in a GIC or savings account, the interest that money earns is fully taxable. The winnings themselves remain untouched; it's the returns on those winnings that enter the tax system.

What about winnings from U.S. platforms?

This comes up because some Canadians have accounts at offshore or U.S.-facing sites. If you received U.S. lottery or gambling winnings, you do not report this income on your Canadian income tax return, as this income is not taxable in Canada. However, U.S. casinos typically withhold a percentage of large wins from Canadian players under U.S. tax rules, and you cannot claim a credit for any taxes withheld on these winnings on your Canadian return. That's a separate U.S. tax matter. This is also a good reason to stick to Ontario's regulated market — licensed operators here are registered with iGaming Ontario and regulated by the AGCO, so you're playing in a framework designed for Canadians, without cross-border tax complications.

Keep records anyway

Even if you're clearly a recreational player, it's sensible to keep basic records of significant wins and losses — session summaries, withdrawal confirmations from your Ontario-licensed operator. If a taxpayer states that the source of funds is lottery or other winnings, the CRA will request documents that support the winnings and losses for all significant amounts, and will test actual transactions to verify the taxpayer's statements. Good records mean you can demonstrate the recreational nature of your play if questions ever arise.

Tax law in this area has nuance, and anyone whose gambling activity is genuinely substantial should get advice from a Canadian tax professional — this is one of those areas where a conversation with a CRA-knowledgeable accountant is worth the cost. If you ever feel your gambling is becoming something other than entertainment, ConnexOntario (1-866-531-2600) is the right call. The primary CRA reference document is Income Tax Folio S3-F9-C1 on the Canada.ca website.