613.2. For the purposes of sections 600, 600.0.3, 600.0.4, 602.1, 603 to 605.2, 608 to 613.10 and 727 to 737, the at-risk amount of a taxpayer, in respect of a partnership of which the taxpayer is a limited partner, at any particular time is the amount by which the aggregate of the following amounts exceeds the amount determined under section 613.3:(a) the adjusted cost base to the taxpayer of his partnership interest at that time, computed in accordance with section 613.5, where applicable;
(b) where the particular time is the end of the fiscal period of the partnership, the aggregate ofi. the taxpayer’s share of the income of the partnership from a particular source for that fiscal period, computed under the method described in subparagraph i of paragraph i of section 255, and
ii. the amount referred to in subparagraph viii of paragraph i of section 255 in respect of the taxpayer for that fiscal period.