The first two articles in this series compared mortgage prepayment with investing inside a TFSA and an RRSP. The TFSA comparison was relatively clean because both sides could be considered largely on an after-tax basis: paying down a non-deductible mortgage avoids an after-tax borrowing cost, while investment growth inside a TFSA is generally tax-free. The RRSP complicated the comparison because the contribution can generate a valuable tax deduction today while withdrawals become taxable income later.
Non-registered investing creates a third version of the same decision, and in some ways it is the hardest one.
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