Quick answer: CRA can tax a TFSA in five ways. The headline path is carrying on a business of trading securities: under paragraph 146.2(6) of the Income Tax Act, the TFSA trust itself becomes taxable on the business income, and capital gains attributable to the business are taxed at 100% as business income. The factors come from the archived CRA bulletin IT-479R Transactions in Securities and were applied to a TFSA in Ahamed v The King, 2023 TCC 17, affirmed on appeal in Canadian Western Trust Company v The King, 2024 FCA 108.
What this means: An audit is not the same as a reassessment. Most TFSAs reviewed don’t end up taxed — the IT-479R factors have to point clearly to a business. But the review can ask for trade logs, broker statements, the holder’s outside trading activity, and intent.
What to do next: See how CRA decides whether your trades cross the line. Read the six-factor framework →
The five ways CRA can tax a TFSA
The TFSA is normally tax-free, but five paths exist for CRA to tax all or part of the account. Each path has its own statutory authority, form, rate, and timing, and they can stack:
| Trigger | Tax | Who pays | Form / authority |
|---|---|---|---|
| Carrying on a business (day trading) | Trust pays tax on business income at top marginal rate; 100% of trading gains taxed as business income | The TFSA trust | T3 Trust Income Tax and Information Return; ITA s. 146.2(6) |
| Non-qualified investment | 50% of FMV when acquired or when it became non-qualified (refundable if disposed of by end of year after acquisition) | Holder | Form RC243, Schedule A; ITA s. 207.04 |
| Prohibited investment | 50% of FMV; any income earned is taxed as an advantage at 100% | Holder | Form RC243, Schedule B; ITA s. 207.04 and s. 207.05 |
| Advantage (e.g., swap, related-party benefit, deliberate over-contribution) | 100% of the advantage value | Holder | Form RC243; ITA s. 207.05 |
| Excess contributions | 1% per month on highest excess | Holder | Form RC243; ITA s. 207.02 |
Day trading: the business-income path and ITA s. 146.2(6)
The operative provision is paragraph 146.2(6) of the Income Tax Act: where a TFSA trust carries on a business or holds property as inventory of a business, tax is payable by the trust on its taxable income, including business income and capital gains attributable to the business. The trust’s tax bill is calculated at the top marginal federal rate (currently 33%) plus the applicable top provincial rate.
The Income Tax Act does not define “carrying on a business” in the TFSA context with a bright-line rule. Instead, CRA applies the long-standing IT-479R Transactions in Securities factors, the same framework used to decide capital-vs-business for any taxpayer’s securities trading.
The IT-479R factors CRA uses
Paragraph 11 of the archived CRA Interpretation Bulletin IT-479R Transactions in Securities lists the factors a court considers when deciding whether trading constitutes a business. The Tax Court and FCA have applied these factors to TFSA day-trading cases, including Ahamed. The six factors most commonly weighed:
- Frequency of transactions — high turnover and short holding periods weigh toward business.
- Period of ownership — trades measured in days or hours weigh against capital treatment.
- Knowledge of securities markets — sophisticated knowledge or sector expertise weighs toward business.
- Securities transactions form part of the taxpayer’s ordinary business — an investment adviser or licensed broker has a strong adverse factor.
- Time spent — studying markets and managing the account daily weighs toward business.
- Financing — use of margin, derivatives, or borrowed money weighs toward business.
Two additional factors sometimes cited: advertising the trading activity to the public and the nature of the securities (speculative or non-dividend-paying issues). No single factor decides the case — courts weigh them together.
What Ahamed v The King confirmed
In Ahamed v The King, 2023 TCC 17, the Tax Court of Canada held that a TFSA day-trading penny stocks was carrying on a business and that the TFSA trust was therefore taxable on its trading income under paragraph 146.2(6). The taxpayer was an investment adviser whose TFSA grew from approximately $15,000 of contributions to over $617,000 through frequent trading. The Federal Court of Appeal affirmed in Canadian Western Trust Company v The King, 2024 FCA 108.
Ahamed did not create a new rule. It confirmed three things:
- The IT-479R factors apply to TFSA accounts the same way they apply to any taxpayer’s securities trading.
- The TFSA trust itself is the taxable person under paragraph 146.2(6) — CRA does not have to reassess the individual.
- An investment adviser’s professional knowledge is a heavy adverse factor under the IT-479R test.
If your TFSA is selected for review, the CRA letter typically requests the IT-479R factors (frequency, period, market knowledge, time, financing, ordinary business overlap) plus broker statements and intent documentation.
Non-qualified vs prohibited investment
Two related but distinct categories carry the same 50% tax:
- Non-qualified investment — an investment that does not meet the qualified investment rules in section 204 of the Income Tax Act (e.g., shares listed only on a non-designated exchange, certain crypto products held directly, naked options). The tax is 50% of fair market value when the asset is acquired or when it becomes non-qualified, refundable if the asset is disposed of by the end of the year after acquisition.
- Prohibited investment — an investment in which the holder has a significant interest (typically 10% or more) or a non-arm’s-length relationship (e.g., shares of a private corporation the holder controls). The 50% tax applies, and any income or gains from the investment are also taxed as an advantage at 100%.
Advantages: 100% of the value
An “advantage” is a benefit, loan, or debt attributable to the TFSA that would not have arisen without the account. Examples: a swap transaction between a TFSA and a non-registered account, a related-party benefit, or a deliberate over-contribution intended to capture growth on the excess. The tax is 100% of the advantage value, payable by the holder, on Form RC243.
Excess contributions: 1% per month
If you contribute more than your TFSA contribution room, the excess is subject to a 1% per month tax for every month it remains in the account. The penalty is calculated on the highest excess in each month and is paid on Form RC243.
What an audit looks like in practice
CRA selects TFSAs for review using a combination of issuer reporting (T4023 TFSA Issuer Annual Return), unusual growth patterns, and intelligence from external sources. A typical letter requests:
- Complete TFSA transaction history (deposits, withdrawals, trades).
- Broker statements for the period under review.
- The holder’s outside trading activity (non-registered accounts, RRSP, margin).
- The holder’s occupation and time commitment to trading.
- Any communications with brokers (research, trade recommendations).
If the IT-479R factors point to a business, CRA issues a notice of reassessment to the TFSA trust under paragraph 146.2(6). Interest is calculated from the original filing deadlines for the years under review. The holder receives the reassessment as trustee of the TFSA.
How to reduce the risk that CRA finds your TFSA is a business
- Keep average holding periods in days or weeks at minimum, ideally months. Same-day round-trips are the strongest adverse factor.
- Don’t use margin in your TFSA strategy. Even though the TFSA itself can’t hold borrowed money directly, using outside leverage funded by TFSA flows weighs toward business.
- Avoid options strategies that look like a trading operation. Covered calls on long-held positions are usually fine; frequent naked options or short strangles look like a business.
- Don’t advertise the trading. A YouTube channel or paid newsletter discussing your TFSA trades is an advertising factor.
- If you’re a finance professional, expect heightened scrutiny. Investment advisers, brokers, and analysts trade on knowledge that weighs adversely under IT-479R.
- Consider non-registered accounts for active strategies. See TFSA vs non-registered for active trading.
Frequently asked questions
How many TFSA trades per year is too many?
There is no statutory threshold. Courts weigh frequency along with five other factors. Hundreds of intraday trades in a year (as in Ahamed) clearly weigh toward business; a few dozen swing trades typically don’t. See How many trades are too many in a TFSA?
Can I trade options in a TFSA?
Yes, but only certain strategies. Covered calls on long positions, cash-secured puts, and protective puts are generally allowed by brokers. Naked options and certain other strategies are non-qualified and trigger the 50% tax. See Can you trade options in a TFSA in Canada?
If CRA reassesses my TFSA, what does the tax bill look like?
The TFSA trust pays tax on its business income at the top federal marginal rate (33%) plus the applicable top provincial rate — combined typically 45-54%. The full trading income (not 50%) is taxed because it is treated as business income, not capital gains. Interest applies from the original return filing date. See TFSA CRA reassessment: how the tax bill works.
Did Ahamed v The King change the law?
No. It confirmed that the existing IT-479R factors apply to TFSAs and that paragraph 146.2(6) makes the TFSA trust the taxable person. The Federal Court of Appeal affirmed the decision in Canadian Western Trust Company v The King, 2024 FCA 108.
Can CRA reassess years that are statute-barred?
The normal reassessment period for a TFSA trust is generally three years, but CRA can reassess statute-barred years where misrepresentation attributable to neglect, carelessness, willful default, or fraud is established. Most TFSA day-trading reassessments are within the normal period.