Huge difference with respect to investing with intent on Capital growth over time versus high volume Trading to create short term income.....the latter being looked at by CRA as taxabe income in the year it's created.
And this goes without saying in non-registered accounts, as well.
When trading profits are income
Jamie Golombek / June 18, 2013
http://www.advisor.ca/news/industry-news/when-trading-profits-are-income-119954
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CRA TFSA ‘crackdown’ no cause for alarm
by Jonathan Chevreau / December 10th, 2014
http://www.moneysense.ca/save/tfsa/cra-tfsa-crackdown-no-cause-for-alarm