(1) The amount of the residuary income of an estate for any year of assessment shall be ascertained by deducting from the aggregate income of the estate for that year -
(a) the amount of any annual interest, annuity or other annual payment for that year which is a charge on residue and the amount of any payment made in that year in respect of any such expenses incurred by the personal representatives as such in the management of the assets of the estate as, in the absence of any express provision in a will, would be properly chargeable to income, but excluding any such interest, annuity or payment allowed or allowable in computing the aggregate income of the estate, and
(b) the amount of any of the aggregate income of the estate for that year to which a person has on or after assent become entitled by virtue of a specific disposition either for a vested interest during the administration period or for a vested or contingent interest on the completion of the administration.
(a) In t
…