the TFSA is not meant to be a trading account. you can, however, sell and buy ocassionally, but there have been investigations going on with accounts that are large and have been used for trading. This account was originally intended to be a type of savings account but i don't think that it was ever stipulated that way. I for one would not want Rev Canada on my back when POET explodes so i have not done any trading in my TFSA.