74.2. For the application of paragraph c of section 70 and section 71 to the taxation year 1986, such part as a taxpayer designates in his fiscal return for that year of the aggregate of all amounts contributed by the taxpayer after 31 December 1985 and before 9 October 1986 as additional voluntary contributions is deemed to have been contributed in respect of services rendered by the taxpayer before 1 January 1986.