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If the annuitant under a registered retirement savings plan dies before the maturity of the plan, there may be deducted in computing the annuitant’s income for the taxation year in which the annuitant dies an amount not exceeding the amount determined, after all amounts payable out of or under the plan have been paid, by the formula A – B where A is the total of all amounts each of which is the amount deemed by subsection (8.8) to have been received by the annuitant as a benefit out of or under the plan, an amount (other than an amount described in paragraph (c)) received, after the death of the annuitant, by a taxpayer as a benefit out of or under the plan and included, because of subsection (8), in computing the taxpayer’s income, or a tax-paid amount in respect of the plan; and B is the total of all amounts paid out of or under the plan after the death of the annuitant.