The mortgage-versus-TFSA decision is relatively clean. If I have $25,000 available, I can use it to reduce a non-deductible mortgage or invest it inside an account where future growth is generally tax-free. The mortgage gives me something economically close to a guaranteed after-tax return equal to the interest I avoid. The TFSA gives me an uncertain investment return, but if that return materializes, I generally keep all of it.
Replace the TFSA with an RRSP and the comparison gets considerably more interesting.
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