123. Where an obligation is issued at a discount, the first owner of the obligation who is resident in Canada, who is not a person exempt, because of sections 980 to 998, from tax on part or on all of the person’s taxable income and of whom the obligation is a capital property shall include, in computing his income for the taxation year in which he has become the owner of the obligation, the amount by which the principal amount of the obligation exceeds the amount for which the obligation was issued,(a) in the case of an obligation issued after 20 December 1960 and before 19 June 1971, if the stipulated rate of interest payable on the obligation is less than 5% annually and if the yield from the obligation, expressed in terms of an annual rate on the amount for which the obligation was issued, exceeds such annual rate of interest by more than one-third; or
(b) in the case of an obligation issued after 18 June 1971, other than an obligation that is a prescribed debt obligation for the purposes of section 92.5, if the yield from the obligation, expressed in the same manner, exceeds by more than one-third the stipulated rate of interest payable on such obligation.