Offer your thoughts or opinion on the input financial query or topic using your financial background.

What type of investments should be in a TFSA, given its tax-free growth and withdrawal benefits?
I think "optimal" is a term that needs to be better qualified - what's optimal investment for one person is not necessary optimal for another, as it depends on the investor's time horizon, risk tolerance, and investment knowledge. I would personally put fix-income (or products that generates incomes that CRA considers as "interest") products in the TFSA so the gains aren't taxed at all.  I would consider putting preferred shares in this account as well, since dividend incomes are taxed higher than capital gain and preferred shares don't usually change in price unless the company's ability to pay the dividends are in-doubt.  I don't want to put common equities in TFSA as that would take away your ability to leverage past losses to reduce future capital gains. If you are using TFSA as a way to accelerate saving for a near-term purchase, then you definitely want to employ fix-income products as the underlying saving vehicle, since market volatility would be your enemy (unless you are feeling very lucky).   If you are using TFSA as a way to supplement your registered retirement saving account, then you can treat it the same way you would invest in your RRSP.