772.16. A taxpayer may deduct an amount for a particular taxation year, under section 772.15, in relation to an amount designated by a designated trust in its fiscal return filed for a taxation year under Part I of the Income Tax Act (Revised Statutes of Canada, 1985, chapter 1, 5th Supplement), in accordance with subsection 13.1 or 13.2 of section 104 of that Act, only if the taxpayer encloses with the fiscal return the taxpayer is required to file for the particular year under section 1000, any document establishing the income tax paid by the designated trust to the government of a province, other than Québec, that relates to the designated amount.