Versions of s. 57(1)
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Notwithstanding subparagraph 56(1)(a)(i), there shall be included in computing the income of a taxpayer in respect of a payment received by the taxpayer out of or under a superannuation or pension fund or plan the investment income of which has at some time been exempt from taxation under the Income War Tax Act by reason of an election for that exemption by the trustees or corporation administering the fund or plan, only that part of the payment that remains after deducting the proportion thereof