" Repayment supplement in respect of certain delayed payments or refunds (1) In any case where- (a) a person is entitled to a VAT credit … and the conditions mentioned in subsection (2) below are satisfied, the amount which, apart from this section, would be due by way of that payment or refund shall be increased by the addition of a supplement equal to 5 per cent of that amount or£50 , whichever is the greater. (2) The said conditions are- (a) that the requisite return or claim is received by the Commissioners not later than the last day on which it is required to be furnished or made, and (b) that a written instruction directing the making of the payment ... is not issued by the Commissioners within the relevant period, and (c) that the amount shown on that return … as due by way of payment … does not exceed the payment … which was in fact due by more than 5 per cent of that payment … or£250 , whichever is the greater. (2A) The relevant period in relation to a return or claim is the period of 30 days beginning with the later of- (a) the day after the last day of the prescribed accounting period to which the return or claim relates, and (b) the date of the receipt by the Commissioners of the return or claim. (3) Regulations may provide that, in computing the period of 30 days referred to in subsection (2A) above, there shall be left out of account periods determined in accordance with the regulations and referable to- (a) the raising and answering of any reasonable inquiry relating to the requisite return or claim, (b) the correction by the Commissioners of any errors or omissions in that return or claim, and (c) in the case of a payment, the following matters, namely- (i) any such continuing failure to submit returns as is referred to in section 25(5), and (ii) compliance with any such condition as is referred to in paragraph 4(1) of Schedule 11. (4) In determining for the purposes of regulations under subsection (3) above whether any period is referable to the raising and answering of such an inquiry as is mentioned in that subsection, there shall be taken to be so referable any period which- (a) begins with the date on which the Commissioners first consider it necessary to make such an inquiry, and (b) ends with the date on which the Commissioners- (i) satisfy themselves that they have received a complete answer to the inquiry, or (ii) determine not to make the inquiry or, if they have made it, not to pursue it further, but excluding so much of that period as may be prescribed; and it is immaterial whether any inquiry is in fact made or whether it is or might have been made of the person or body making the requisite return or claim or of an authorised person or of some other person. (5) Except for the purpose of determining the amount of the supplement- (a) a supplement paid to any person under subsection (1)(a) above shall be treated as an amount due to him by way of credit under section 25(3) … (6) In this section “requisite return or claim” means- (a) in relation to a payment, the return for the prescribed accounting period concerned which is required to be furnished in accordance with regulations under this Act … "
"(2) Subject to the provisions of this section, he is entitled at the end of each prescribed accounting period to credit for so much of his input tax as is allowable under section 26, and then to deduct that amount from any output tax that is due from him. (3) If either no output tax is due at the end of the period, or the amount of the credit exceeds that of the output tax then, subject to subsections (4) and (5) below, the amount of the credit or, as the case may be, the amount of the excess shall be paid to the taxable person by the Commissioners; and an amount which is due under this subsection is referred to in this Act as a “VAT credit”."
“(1) Subject to paragraph (1A) and (2) 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.”
“198 Computation of period In computing the period of 30 days referred to in section 79(2)(b) of the Act, periods referable to the following matters shall be left out of account (a) the raising and answering of any reasonable inquiry relating to the requisite return or claim, (b) the correction by the Commissioners of any errors or omissions in that requisite return or claim, and (c) in any case to which section 79(1)(a) of the Act applies, the following matters, namely (i) any such continuing failure to submit returns as is referred to in section 25(5) of the Act, (ii) compliance with any such condition as is referred to in paragraph 4(1) of Schedule 11 to the Act. 199 Duration of period For the purpose of determining the duration of the periods referred to in regulation 198, the following rules shall apply (a) in the case of the period mentioned in regulation 198(a), it shall be taken to have begun on the date when the Commissioners first raised the inquiry and it shall be taken to have ended on the date when they received a complete answer to their inquiry; (b) in the case of the period mentioned in regulation 198(b), it shall be taken to have begun on the date when the error or omission first came to the notice of the Commissioners and it shall be taken to have ended on the date when the error or omission was corrected by them; (c) in the case of the period mentioned in regulation 198(c)(i), it shall be determined in accordance with a certificate of the Commissioners under paragraph 14(1)(b) of Schedule 11 to the Act; (d) in the case of the period mentioned in regulation 198(c)(ii), it shall be taken to have begun on the date of the service of the written notice of the Commissioners which required the production of documents or the giving of security, and it shall be taken to have ended on the date when they received the required documents or the required security.”
“… the context of the term VAT credit in section 79(1)(a) does not admit of its being construed as a collection of different VAT credits, and consequently of different "amounts", wherever that word is found in section 79. In summary, there is one VAT credit arising for each claim for each prescribed accounting period the amount of which falls to be increased by the 5% repayment supplement, always given that the conditions in section 79(2) are satisfied.”