5.3. Section 43 of the Taxation Act (chapter I-3) does not apply to amounts received by a taxpayer that were payable to the taxpayer in accordance with a plan referred to in that section and established before 19 June 1971, if the loss of income mentioned therein results from an event occurring before 1 January 1974. For the purposes of the first paragraph, a plan that was established before 19 June 1971 does not cease to be a plan established before that date solely because of changes made therein on or after that date for the purpose of ensuring that the plan qualifies as one entitling the employer of persons covered under the plan to a reduction of unemployment insurance premiums, as provided for in subsection 2 of section 50 of the Unemployment Insurance Act (Revised Statutes of Canada, 1985, chapter U-1), as it read before its repeal.