I have never borrowed to invest unless you count not paying of the mortgage faster.Personally, I would use borrowed money for non-registered investments which frees up MP's money for TFSA investments. You need to run your own numbers. Canadian dividends get special treatment for income tax. If you are earning ~4% and paying ~2.5% tax, I suspect you will be better in a non-registered account. Only hindsight can tell you if you made the right choice as you can't accurately predict potential capital gains on an investment in a market segment.
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