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Do I still need to pay capital gains taxes when I profit from a stock in a foreign currency?
I'll break it down into steps. Total gain/ loss for the whole thing is 5 CAD. You only have to worry about these calculations if you keep some USD and convert it at your leisure.  Or if you have a US dollar in your wallet from your last vacation. Don't forget to subtract commissions (converted to CAD of course). *Some people just use an average exchange rate for the whole year, which you can also get from the BoC. ^There's $200 of tax free gains allowed for pure currency transactions.  This allows small gains to be ignored.