In some cases, income earned from trading can be considered to be 'business income' which is eligible to be taxed by the CRA. The CRA does not have a limit of an acceptable number of trades that you can make within a TFSA, but they reserve the right to audit the activities within your account if it appears that individuals are engaging in inappropriate trading activities (i.e. if it appears that you are attempting to earn your living by trading in your TFSA). If you have additional questions on this, we recommend speaking to your trusted tax professional!