931.1. Where, at any time in a taxation year, a particular amount in respect of a registered retirement savings plan that is a spousal plan in relation to an individual is required, by reason of section 914 or 929, to be included in computing the income of the individual’s spouse before the date provided for the first payment of benefits under the plan or as a payment in full or partial commutation of a retirement income under the plan and the individual is not an individual who is living apart from his spouse at that time because of the breakdown of their marriage, the individual shall include at that time, in computing his income for the year, the lesser of the following amounts:(a) the aggregate of all amounts each of which is a premium paid by him in the year or in one of the two preceding taxation years to a registered retirement savings plan under which his spouse was the annuitant at the time the premium was paid, and
(b) the particular amount.