711.1. For the purpose of determining the amount deductible under section 710 in computing the taxable income of a corporation for a taxation year, the following rules apply:(a) an amount relating to a gift is deductible only to the extent that it exceeds amounts in respect of the gift deducted in computing the corporation’s taxable income for preceding taxation years; and
(b) no amount in respect of a gift made in a particular taxation year is deductible under any of paragraphs a to e of section 710 until amounts deductible under that paragraph in respect of gifts made in taxation years preceding the particular year have been deducted.