40. (1) Except as otherwise expressly provided in this Part
(a) a taxpayer's gain for a taxation year from the disposition of any property is the amount, if any, by which
(i) if the property was disposed of in the year, the amount, if any, by which the taxpayer's proceeds of disposition exceed the total of the adjusted cost base to the taxpayer of the property immediately before the disposition and any outlays and expenses to the extent that they were made or incurred by the taxpayer for the purpose of making the disposition, or
(ii) if the property was disposed of before the year, the amount, if any, claimed by the taxpayer under subparagraph 40(1)(a)(iii) in computing the taxpayer's gain for the immediately preceding year from the disposition of the property,
exceeds
(iii) subject to subsection 40(1.1), such amount as the taxpayer may claim
(A) in the case of an individual (other than a trust) in prescribed form filed with the taxpayer's return of income under this Part for the year, and
(B) in any other case, in the taxpayer's return of income under this Part for the year,
as a deduction, not exceeding the lesser of
(C) a reasonable amount as a reserve in respect of such of the proceeds of disposition of the property that are payable to the taxpayer after the end of the year as can reasonably be regarded as a portion of the amount determined under subparagraph 40(1)(a)(i) in respect of the property, and
(D) an amount equal to the product obtained when 1/5 of the amount determined under subparagraph 40(1)(a)(i) in respect of the property is multiplied by the amount, if any, by which 4 exceeds the number of preceding taxation years of the taxpayer ending after the disposition of the property; and
(b) a taxpayer's loss for a taxation year from the disposition of any property is,
(i) if the property was disposed of in the year, the amount, if any, by which the total of the adjusted cost base to the taxpayer of the property immediately before the disposition and any outlays and expenses to the extent that they were made or incurred by the taxpayer for the purpose of making the disposition, exceeds the taxpayer's proceeds of disposition of the property, and
(ii) in any other case, nil. | 
