Versions of s. 20.4(4)
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If at any time an insurer ceases to carry on all or substantially all of an insurance business (referred to in this subsection as the “discontinued business”), and none of subsections 12.5(4) to (6) apply, there shall be deducted in computing the insurer’s income from the discontinued business for the insurer’s taxation year that includes the time that is immediately before that time, the amount determined by the formula A – B where A is any amount included under subsection 12.5(2) in computing the insurer’s income from the discontinued business for its transition year; and B is the total of all amounts each of which is an amount deducted under subsection (3) in computing the insurer’s income from the discontinued business for a taxation year that began before that time.