Income Tax Act ( R.S.C. , 1985, c. 1 (5th Supp.))

A - (B + C) where is the total of all amounts each of which is a support amount paid after 1996 and before the end of the year by the taxpayer to a particular person, where the taxpayer and the particular person were living separate and apart at the time the amount was paid, is the total of all amounts each of which is a child support amount that became payable by the taxpayer to the particular person under an agreement or order on or after its commencement day and before the end of the year in respect of a period that began on or after its commencement day, and is the total of all amounts each of which is a support amount paid by the taxpayer to the particular person after 1996 and deductible in computing the taxpayer’s income for a preceding taxation year;