7.31. Despite section 7.21, the eligible amount of a gift made by a taxpayer is equal to zero if the taxpayer does not, before a receipt referred to in section 712 or 752.0.10.3 is issued in respect of the gift, inform the qualified donee or the recipient of any circumstances in respect of which any of sections 7.21, 7.25, 7.26, 7.28 and 7.29 causes the eligible amount of the gift to be less than the fair market value, determined without reference to sections 7.25, 716 and 752.0.10.12, of the property that is the subject of the gift.