262.5. If at any time a taxpayer disposes of one or more capital properties that are included in a flow-through share class of property and paragraph a or d of section 231.2 applies in respect of the disposition (in this section referred to as the “actual disposition”), the taxpayer is deemed to have realized a capital gain from a disposition at that time of another capital property equal to the lesser of(a) the taxpayer’s exemption threshold at that time in respect of the flow-through share class of property; and
(b) the aggregate of all amounts each of which is a capital gain from the actual disposition (calculated without reference to this section).