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“(1A) (a) Where, after the making of an agreement for the delivery of goods or the rendering of services and before the date on which under subsection (1) or (2), as may be appropriate, of section 19 any tax in respect of the transaction would, if the proviso to the said subsection (1) were disregarded, fall due, there is a change in the amount of tax chargeable on the delivery or rendering in question, then, in the absence of agreement to the contrary, there shall be added to or deducted from the total amount of the consideration and any tax stated separately under the agreement an amount equal to the amount of the change in the tax chargeable.
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