Should I keep records of my wins and losses at Ontario online casinos for tax purposes?

Canada's tax treatment of gambling winnings is genuinely different from most countries, and the short answer for the vast majority of Ottawa players is: your casino winnings are not taxable income. But the longer answer matters — because the line between "recreational player" and "taxable gambler" is real, and knowing which side you're on is worth understanding.

The general rule: recreational winnings are not taxed

Lottery winnings of any amount are not reported or taxed in Canada, unless the prize can be considered income from employment, a business, or property, or a prize for achievement. The CRA treats casino and online gambling winnings the same way — they're considered a windfall, not income. Factors indicating that a particular receipt is a windfall include that the taxpayer made no organized effort to receive the payment, had no customary or specific expectation to receive it, and the payment was not earned as a result of any activity or pursuit of gain. If you're playing slots or blackjack at a licensed Ontario online casino for entertainment, that description fits you perfectly.

So if you had a great run at an iGaming Ontario-registered site this year, you don't need to report those winnings on your T1. Lottery and certain other winnings are non-taxable in Canada — however, if the taxpayer is in the business of gambling, the proceeds and losses are considered for income tax purposes. That second clause is where things get nuanced.

The exception: when gambling becomes a business

Whether a taxpayer's activities constitute carrying on a gambling business is a question of fact that can be determined only by an examination of all the circumstances and the taxpayer's entire course of conduct. The CRA considers factors including the degree of organization in pursuing the activity, the existence of special knowledge or inside information that reduces the element of chance, the taxpayer's intention to gamble for profit as a means of gaining a livelihood, and the extent of gambling activities including the number and frequency of bets.

Crucially, playing frequently doesn't automatically make you a "business." 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. The exceptional cases where gambling has been held taxable relate to taxpayers who applied inside information, knowledge, and skill to their activities. For most Ottawa recreational players, this threshold is never crossed.

So why keep records at all?

Even if your winnings aren't taxable, there are two practical reasons records can protect you:

• Source-of-funds questions. Non-taxable winnings can arise as an issue when the CRA is trying to identify the source of funds supporting a taxpayer's accumulation of assets, lifestyle, or bank deposits — and if you state that gambling is the source, they may request documents that support the winnings and losses for all significant amounts. A paper trail from your licensed operator's account history is exactly the kind of documentation that resolves this quickly.
• If you're ever in the grey zone. If your gambling activity is serious enough that you're uncertain whether you cross into business territory, records become essential — both to support a tax position and to consult a tax professional who can assess your specific situation.

Ontario's regulated online casinos (those registered with iGaming Ontario and the AGCO) maintain detailed transaction histories in your player account — deposits, withdrawals, session summaries. That built-in record is a practical starting point. You can verify that a site is properly registered by checking for the iGaming Ontario and BetGuard logos on the site, or by consulting the official iGaming Ontario registry directly.

One important note on interest

Any interest that you earn when you invest lottery winnings must be reported on your return. The same logic applies to gambling winnings: the original win isn't taxable, but if you park the money in a savings account or investment and it earns interest or returns, that income is taxable in the usual way.

Tax law in this area involves fact-specific judgments, so if you're playing at a level where the business-income question feels live, a conversation with a Canadian tax accountant is money well spent. The CRA's Income Tax Folio S3-F9-C1 is the authoritative published guidance and is freely available on Canada.ca. And if gambling ever starts feeling like an obligation rather than a choice, ConnexOntario (1-866-531-2600) is there — available 24/7 for Ontario residents 19+.