“Subject to paragraph (1A) below, and save as the Commissioners may otherwise allow or direct either generally or specially, a person claiming deduction of input tax under section 25(2) of the Act shall do so on a return made by him for the prescribed accounting period in which the VAT became chargeable save that, where he does not at that time hold the document or invoice required by paragraph (2) below, he shall make his claim on the return for the first prescribed accounting period in which he holds that document or invoice”
“At the time of claiming deduction of input tax in accordance with paragraph (1) above, a person shall, if the claim is in respect of- (a) a supply from another taxable person, hold the document which is required to be provided under regulation 13”