Determining the ACB of Disposed Shares

Since Nortel no longer trades, how do I dispose of the shares in doing a tax calculation? What would be the ACB, considering there was a reverse stock split before the shares were delisted?

This still haunts investors, it seems. The ACB of the shares is the amount you paid for them, or the fair market value of the shares at the time you received them through an inheritance. The proceeds would be zero, so there is a capital loss. You can elect to have disposed of these shares for nil proceeds and immediately re-acquired them for the same – nil. In the future, if the company was ever to be resurrected, and the shares could in fact be sold, your proceeds at that time would be a capital gain, as your ACB of the shares would be zero.