The purpose of the T5008 information slip is to report the amount paid or credited to an investor for securities disposed of or redeemed during the year.
Firms that issue T5008 slips generally report only the “proceeds of disposition” (box 21) and not the “cost or book value” (box 20) on the slips since the cost is often either not known or tracked by many brokerage firms. Therefore the onus is on the investor — perhaps with your assistance — to track their own tax cost or adjusted cost base of the securities held, in order to accurately report the capital gain or loss on his or her tax return.
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