224.1. For the purposes of section 224, an amount is deemed to be an expenditure made in a taxation year by a taxpayer as repayment of an amount described in paragraph b of section 225 if the amount(a) reduced, by the effect of paragraph b of section 225, the aggregate of the amounts that may be deducted by the taxpayer under sections 222 to 224 in computing his income for a taxation year;
(b) was not received by the taxpayer; and
(c) ceased in the taxation year to be an amount that the taxpayer can reasonably be expected to receive.