The Tax-Free Financial savings Account (TFSA) is among the greatest wealth-building instruments out there to Canadians. Tax-free development. Tax-free withdrawals. No affect on authorities advantages.
However on the subject of U.S. shares, there’s advantageous print many buyers overlook — and it might probably quietly scale back your returns.
Earlier than loading your TFSA with American blue chips or high-yield dividend shares, listed below are three guidelines that might materially have an effect on your portfolio that it is best to know.

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The 15% dividend withholding tax
The most important shock for a lot of buyers is that U.S. dividends in a TFSA are not absolutely tax-free.
As a result of the TFSA is just not acknowledged beneath the Canada–U.S. tax treaty, dividends paid by U.S. corporations are topic to a 15% non-recoverable withholding tax. That tax is routinely deducted by the Inner Income Service (IRS) earlier than the dividend even hits your account.
Capital positive factors stay tax-free — however revenue buyers really feel the drag.
For instance, for those who maintain Comcast (NASDAQ:CMCSA), which yields roughly 4.2%, the precise yield inside a TFSA falls to about 3.6% after the 15% withholding tax. On a $500 annual dividend, you’d solely obtain $425.
The identical rule applies to Canadian-listed exchange-traded funds (ETFs) that maintain U.S. shares. As an example, Vanguard S&P 500 Index ETF nonetheless faces the identical U.S. dividend withholding on the fund stage.
Learn how to reply? Contemplate putting high-yield U.S. dividend shares inside a Registered Retirement Financial savings Plan (RRSP) or Registered Retirement Earnings Fund (RRIF), the place the treaty exempts them from withholding tax. In the meantime, high quality growth-focused names that pay little or no dividends — similar to Amazon — might higher swimsuit a TFSA.
Foreign money conversion: The hidden price of buying and selling international shares
One other ignored drag comes from international alternate charges.
Whenever you purchase U.S. shares utilizing Canadian {dollars}, most brokerages cost a forex conversion unfold of 1.5% to 2% — on prime of buying and selling commissions. Should you commerce ceaselessly, these prices quietly compound.
There are two sensible options.
First, take into account opening a U.S. dollar-denominated TFSA. This lets you convert forex as soon as, then commerce U.S. securities with out repeated international alternate prices.
Second, some buyers use Canadian depositary receipts (CDRs), which commerce in Canadian {dollars} and supply built-in forex hedging. Whereas handy, buyers ought to perceive the construction and embedded prices earlier than counting on them long run. It could make sense to make use of CDRs if the inventory you wish to put money into is obtainable there and U.S. {dollars} are sturdy in opposition to Canadian {dollars}.
Foreign money friction could appear minor, however over a long time, minimizing it might probably meaningfully increase compounded returns.
The day-trading lure
Lastly, the TFSA is designed for investing — not energetic buying and selling.
If the Canada Income Company (CRA) determines that your exercise resembles “carrying on a enterprise” — which means frequent, speculative buying and selling — your positive factors may grow to be absolutely taxable.
There is no such thing as a clear rule defining what number of trades set off scrutiny. As a substitute, the CRA considers components similar to frequency, holding interval, information of markets, and intent. In brief: deal with your TFSA like a long-term compounding machine, not a buying and selling account.
Investor takeaway
The TFSA stays an distinctive software — however U.S. shares introduce nuances that buyers shouldn’t ignore:
- U.S. dividends face a 15% non-recoverable withholding tax.
- Foreign money conversion charges can erode returns if not managed.
- Extreme buying and selling dangers dropping the TFSA’s tax-free standing.
Used correctly, a TFSA can nonetheless be a great house for growth-oriented U.S. shares. However understanding the small print ensures you retain extra of what your investments earn — which, over time, could make a surprisingly giant distinction.