Capital gains vs business income: how Canada taxes active traders

Why the CRA's capital-versus-income line matters for Canadian traders: inclusion rate, loss rules, the factors it weighs, Form T123 and records to keep.

Two Canadian traders can make exactly the same net profit in a year and owe very different amounts of tax. The difference is not the market or the broker statement. It is whether the Canada Revenue Agency (CRA) treats the activity as investing on capital account or as carrying on a business. This guide explains why that label matters, what facts the CRA weighs, where the Canadian securities election fits, and what to document. It is general information, not tax advice: rules change, and your own facts decide the answer, so take your situation to a qualified tax professional.

Why the label matters

On capital account, only part of a gain is taxed. The CRA's Capital Gains guide (T4037) defines the inclusion rate as the fraction you multiply a capital gain or loss by, and the CRA's page on calculating and reporting capital gains and losses works its examples at one-half: fifty percent of the gain is the taxable capital gain. On income account, the whole net profit is business income and fully taxable, but reasonable expenses of earning it are generally deductible.

The inclusion rate has been in flux. In 2024 the federal government proposed raising the rate to two-thirds for some gains; on January 31, 2025 the Department of Finance deferred the change to January 1, 2026, and the CRA's What's new for corporations page now says it was later announced that this proposed increase was cancelled. As of this writing, CRA pages describe the one-half rate. Check the current T4037 for the year you are filing before relying on any rate.

Losses are where the label bites hardest:

• Capital losses produce allowable capital losses that must first be applied against taxable capital gains of the same year. Per the CRA's capital losses page, any excess becomes a net capital loss that generally cannot be deducted from other sources of income such as salary. Under line 25300 it can reduce taxable capital gains in any of the three previous years or any future year.
• Business losses generally reduce your other income for the year. If the loss is more than your other income, you may have a non-capital loss (T4002, chapter 5) which, for tax years ending after 2005, can generally be carried back 3 years and forward 20 years (line 25200).

So capital treatment is kinder to winners and harsher on losers, and business treatment is the reverse. You do not get to pick whichever is better in a given year; the facts decide.

What the CRA looks at

T4037 says the facts surrounding a transaction determine the nature of the gain or loss, and for securities it points readers to archived Interpretation Bulletin IT-479R, Transactions in securities. The CRA has archived that bulletin and no longer updates it, but its list of factors is still the reference the guide gives. Paraphrased, paragraph 11 asks whether:

• Frequency: there is a history of extensive buying and selling.
• Holding period: securities are usually owned only for a short time.
• Knowledge: you have knowledge of or experience in the securities markets.
• Ordinary business: trading forms part of your ordinary business.
• Time spent: a substantial part of your time goes into studying the markets.
• Financing: purchases are financed mainly on margin or other debt.
• Advertising: you have made it known that you are willing to buy securities.
• Nature of the securities: they are normally speculative or non-dividend paying.

Paragraph 12 adds that no single factor may be enough on its own, but a combination of several may well be. Intention matters too, but IT-479R says an intention to sell at a gain is not, by itself, sufficient. In practice that means a day trader who spends most of the session at the screen, holds positions for minutes, uses margin and has years of experience is ticking several boxes at once, whatever they call themselves.

The Canadian securities election (Form T123)

Subsection 39(4) of the Income Tax Act lets an eligible taxpayer elect to treat Canadian securities as capital property. T4037 explains that you make it by filing Form T123, Election on Disposition of Canadian Securities, with your return, and that the CRA will then consider every Canadian security you owned in that year and later years to be capital property. Once made, the election cannot be reversed. That cuts both ways: it locks in capital treatment for future losses too.

Who cannot use it, per T4037: a trader or dealer in securities (other than a mutual fund trust or mutual fund corporation), and anyone who was a non-resident of Canada when the security was sold. IT-479R paragraph 5 describes the CRA's view of a trader or dealer as including someone who participates in the promotion or underwriting of an issue of securities, someone who holds themselves out to the public as a dealer, and someone who uses special knowledge of a particular corporation, not available to the public, to make a quick gain. Whether a very active retail trader falls inside that phrase is a question to put to a qualified tax professional before filing; do not assume the election shields an account that already looks like a business.

Scope is also narrower than people expect. T4037's definition of a Canadian security covers shares of Canadian-resident corporations, units of mutual fund trusts and certain debt issued by Canadian residents, and it says prescribed securities are excluded. Foreign shares, such as US-listed stocks, are not Canadian securities, and the definition does not mention futures or options, so do not assume the election reaches them.

Futures and options: general principles

For commodity futures, the CRA's archived bulletin IT-346R, Commodity Futures and Certain Commodities describes the administrative position: a speculator may generally report gains and losses either on capital account or on income account, provided the chosen method is applied consistently from year to year, and once income treatment has been used the CRA will not accept a change. Where the trading is part of a business, it is on income account. IT-346R is old and archived, so treat it as background and confirm how it applies to equity index futures such as the contracts in our micro E-mini specs guide with a qualified tax professional.

Options follow the same capital-versus-income question. A trader who sells options frequently, as in our covered calls guide, faces the same frequency, holding-period and time-spent facts as a stock trader. The timing and character of option premiums have their own rules; this guide does not cover them.

Illustrative numbers

Illustrative example: two years of net trading results for a trader with $80,000 of salary, using a one-half inclusion rate and an illustrative 30% combined marginal rate. Real marginal rates depend on province and income, so check the current figures.

Illustrative only: same results, two treatments

Item	Capital account	Business income
Year A: net trading gain $20,000	Taxable capital gain $10,000	Business income $20,000 less, say, $2,000 data and platform costs = $18,000
Year A: tax at 30% (illustrative)	$3,000	$5,400
Year B: net trading loss $15,000	Allowable capital loss $7,500; cannot reduce salary	Business loss $15,000 (plus costs) reduces other income
Year B: effect on that year's tax at 30%	$0 now; carried back 3 years or forward against taxable capital gains	About $4,500 lower tax that year

The winning year favours capital treatment; the losing year favours business treatment. That asymmetry is exactly why the CRA looks at the pattern of conduct rather than which answer a taxpayer prefers, and why choosing a treatment after the fact, or switching between years, can lead to a reassessment.

Checklist: facts to document each year

Whichever side of the line you are on, the answer is built from records. Keep these alongside your trade journal:

1. Number of trades per month and median holding period, from broker statements.
2. Hours per week spent trading or researching, and whether you have another job.
3. Share of trading income versus total income.
4. Use of margin or borrowed money, with amounts.
5. Instruments traded: Canadian shares, foreign shares, futures, options. Each may be treated differently.
6. Your written purpose for each account (long-term holding, short-term trading) and whether the accounts are kept separate.
7. Any public profile as a trader: a website, paid content, managing money for others.
8. How you reported in prior years, and whether you have ever filed Form T123.
9. Expenses you would claim if this were a business: data feeds, platform fees, hardware, education.

Decision rule: if several of items 1 to 4 and 7 point toward business activity, assume the CRA may see it that way and get a professional opinion before filing, not after a review letter arrives.

Common mistakes

• Choosing the label by outcome. Reporting capital gains in good years and business losses in bad years is the pattern most likely to draw attention.
• Treating T123 as a shield. It does not apply to traders or dealers, foreign shares or prescribed securities, and it cannot be undone.
• Ignoring costs. Commissions, exchange fees and slippage reduce the gain or increase the loss under either treatment; track them per trade, as in our 1R sizing guide.
• Relying on old rates or bulletins. Inclusion-rate proposals have changed more than once since 2024, and IT-479R and IT-346R are archived. Check the current T4037.

More Canada tax guides are collected on the Canada topic page. Rules change; confirm the current position with a qualified tax professional for your situation.

Examples use round, illustrative numbers and are not actual trades or results. Education only — not investment, tax or legal advice.

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