How do Canadian tax authorities determine whether someone is a casual gambler versus a professional gambler?

The Default: Gambling Winnings Are Not Taxable in Canada

For most Ontario residents who play at registered online casinos, gambling winnings are simply not taxable. Lottery winnings of any amount are excluded from income unless the prize can be considered income from employment, a business, or property. The same logic extends to casino winnings. Lottery and certain other winnings are non-taxable in Canada — however, if the taxpayer is in the business of gambling, the CRA will consider proceeds and losses for income tax purposes. That last clause is where things get genuinely complicated.

What Actually Triggers "Business of Gambling" Status

The CRA doesn't have a simple checklist. The question turns on whether your gambling activity constitutes a source of income — a concept developed through court decisions, not a fixed formula. An individual's gambling activities may result in taxable business income or a business loss if those activities constitute carrying on the business of gambling. Determining the commerciality of gambling is genuinely challenging — games of pure chance, like lotteries, lack the "badges of trade" to which the traditional tests of business activity can be applied.

The courts have been quite protective of casual players. Gambling — even regular, frequent, and systematic gambling — is something that by its nature is not generally regarded as a commercial activity except under very exceptional circumstances. So frequency alone won't do it. Playing every day on an Ontario-registered platform doesn't automatically make you a business.

There are exceptional cases where gambling activities have been held to be taxable, but these relate to taxpayers who applied inside information, knowledge, and skill to their activities. Think of someone who has developed a genuinely systematic, skill-based edge — not someone who plays regularly and happens to win. Business income is income you earn from any activity you carry on for profit, and there must be evidence to support that intention. Both the profit motive and the evidence to prove it need to be present.

One clear-cut case: profits derived from bookmaking or from the operation of any gambling establishment — carried on legally or otherwise — constitute income from a business. Running a gambling operation is categorically different from playing in one.

The Practical Factors CRA and Courts Weigh

When the line is genuinely blurry, the CRA's analysis tends to focus on a cluster of factors. None is individually decisive, but together they paint a picture of whether gambling has crossed into commercial territory:

• Skill versus pure chance. Determining the commerciality of gambling is challenging because games of pure chance lack the badges of trade to which traditional tests of business activity can be applied. Skill-dependent activities attract more scrutiny.
• Profit intention and commercial structure. Business income covers any activity you carry on for profit where there is evidence to support that intention. Does the gambler track results systematically, treat it as a primary livelihood, and operate with a business-like methodology?
• Regularity and organization. While regularity alone isn't enough, a highly organized, methodical approach — dedicated hours, detailed records, strategy development — adds weight to the business argument.
• Reliance on winnings as income. If gambling is a person's primary or sole source of livelihood, that context matters to how the CRA frames the question.

The burden of proof matters too. If the situation is not clear, the benefit of the doubt must be decided in the taxpayer's favour. That's meaningful: the CRA doesn't get to simply assert that a prolific player is running a business.

If you think your situation might sit in the grey zone — particularly if gambling represents a significant portion of your income — this is genuinely a question for a Canadian tax professional, not something to resolve by inference. The CRA's Income Tax Folio S3-F9-C1 is the primary public guidance document on this topic and is worth reading directly. If gambling is affecting your life in ways that go beyond tax questions, ConnexOntario (1-866-531-2600) is available around the clock.