31. For the purpose of computing a taxpayer’s income for a taxation year, and unless otherwise prescribed,(a) any deduction allowed to the taxpayer under a provision of the Income Tax Act (Revised Statutes of Canada, 1985, chapter 1, 5th Supplement) in computing the taxpayer’s income for a preceding taxation year in respect of which the taxpayer or, in the case of a partnership, each of the members, was not subject to tax under this Part, is deemed to have also been allowed to the taxpayer under the corresponding provision of this Part in computing the taxpayer’s income for that preceding year;
(b) where, for the purposes of Part I of the Income Tax Act, the cost, the capital cost or the cost amount of property, to the taxpayer, determined as a consequence of the application of a particular provision of that Act in respect of a transaction or event that occurred during a preceding taxation year described in paragraph a, is different from that which it would have been at that time but for that provision, the corresponding provision of this Part is deemed, for the purpose of determining the cost, the capital cost or the cost amount, as the case may be, of the property to the taxpayer for the purposes of this Part, to have applied in respect of the property at the same time and for the same amounts as for the application of the particular provision in respect of the property.