772.13.3. The deduction provided for in section 772.13.2 in respect of an eligible individual for a taxation year must not exceed the proportion, without exceeding 1, of the individual’s tax otherwise payable under this Part for the year that the amount that is the portion of the individual’s income from an office or employment that is, for the purposes of the Income Tax Act (R.S.C. 1985, c. 1 (5th Suppl.)), included in computing the individual’s taxable income earned in Canada for the year under subparagraph i of paragraph a of subsection 1 of section 115 of that Act and that is attributable to the duties performed by the individual in a province other than Québec, except the portion of that amount that is deducted by the individual in computing the individual’s taxable income for the year under paragraph a of section 725, is of the individual’s taxable income for the year.