Can I trade US stocks & ETFs in a TFSA?

You sure can! The benefits of TFSAs are not limited to Canadian securities, and you can purchase and sell US-listed securities in a TFSA.

That being said, unlike Canadian dividends, any dividends issued from a US-listed stock or ETF may be subject to a non-resident withholding tax of generally 15% (levied by the IRS- the American revenue regulatory body).