(1) Where by virtue of a contract for the sale of an estate or interest in premises there is to be apportioned between the parties a receipt or outgoing in respect of the estate or interest which becomes due after the making of the contract but before the time at which the apportionment is to be made, and a part of the receipt is therefore receivable by the vendor in trust for the purchaser or, as the case may be, a part of the outgoing is paid by the vendor as trustee for the purchaser, the purchaser shall be treated for the purposes of tax under Case V of Schedule D as if that part had become receivable or payable on the purchaser's behalf immediately after the time at which the apportionment is to be made.
(2) Where by virtue of such a contract there is to be apportioned between the parties a receipt or outgoing in respect of the estate or interest which became due before the making of the contract, the parties shall be treated for the purposes of tax under Case V of Schedule D as i
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