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Yes, they are.
Understand that anything is good to go in a TFSA. It is the foreign entity that often makes rules and regs, as is with investing with US companies that pay dividends. This is not a tax that originates in Canada, but this happens in the US side. It can be claimed, and refunded though.
Often, accessing other markets becomes more difficult, but there are ETF's that cater to any market you desire to invest in. They are all good to go.
A TFSA is just that... And that means you can invest in any vehicle you want to, without paying capital gains tax.
Quite simple, really.
There are many passive ETF's that are good, if you want to access the world market without worry.
iShares is pretty good, if ETF's are something you want to condsider...