“13. Determination of amounts payable by contractor and appeal against determination (1) This regulation applies if— (a) there is a dispute between a contractor and a sub-contractor as to— (i) whether a payment is made under a construction contract, or (ii) the amount, if any, deductible by the contractor under section 61 of the Act from a contract payment to a sub-contractor or his nominee, or (b) an officer of Revenue and Customs has reason to believe, as a result of an inspection under regulation 51 or otherwise, that there may be an amount payable for a tax year under these Regulations by a contractor that has not been paid to them, or (c) an officer of Revenue and Customs considers it necessary in the circumstances. (2) An officer of Revenue and Customs may determine the amount which to the best of his judgment a contractor is liable to pay under these Regulations, and serve notice of his determination on the contractor. (3) A determination under this regulation must not include amounts in respect of which a direction under regulation 9(5) has been made and directions under that regulation do not apply to amounts determined under this regulation. (4) A determination under this regulation may— (a) cover the amount payable by the contractor under section 61 of the Act for any one or more tax periods in a tax year, and (b) extend to the whole of that amount, or to such part of it as is payable in respect of— (i) a class or classes of sub-contractors specified in the notice of determination (without naming the individual sub-contractors), or (ii) one or more named sub-contractors specified in the notice. (5) A determination under this regulation is subject to Parts 4, 5, 5A and 6 of [TMA 1970] (assessment, appeals, collection and recovery) as if— (a) the determination were an assessment, and (b) the amount determined were income tax charged on the contractor, and those Parts of that Act apply accordingly with any necessary modifications, except that the amount determined is due and payable 14 days after the determination is made. (6) If paragraph (1)(a) applies and an officer of Revenue and Customs does not make a determination under paragraph (2), either the contractor or the sub-contractor may on giving notice to an officer of Revenue and Customs, apply to the tribunal to determine the matter. ... (8) If paragraph (1)(a) applies— (a) the contractor must make the deduction required by section 61 of the Act from the contract payment or the part of the contract payment, to which the dispute relates, and the amount so deducted is treated as a sum which he is liable to pay to the Commissioners for Her Majesty’s Revenue and Customs under these Regulations; and (b) any amount which, on a final determination of the dispute, is shown not to have been so payable is, except where regulation 56 (application by the Commissioners for Her Majesty’s Revenue and Customs of sums deducted under section 61 of the Act) applies, treated as an overpayment of income tax or corporation tax by the sub-contractor.” (a) there is a dispute between a contractor and a sub-contractor as to— (i) whether a payment is made under a construction contract, or (ii) the amount, if any, deductible by the contractor under section 61 of the Act from a contract payment to a sub-contractor or his nominee, or (b) an officer of Revenue and Customs has reason to believe, as a result of an inspection under regulation 51 or otherwise, that there may be an amount payable for a tax year under these Regulations by a contractor that has not been paid to them, or (c) an officer of Revenue and Customs considers it necessary in the circumstances. (a) cover the amount payable by the contractor under section 61 of the Act for any one or more tax periods in a tax year, and (b) extend to the whole of that amount, or to such part of it as is payable in respect of— (i) a class or classes of sub-contractors specified in the notice of determination (without naming the individual sub-contractors), or (ii) one or more named sub-contractors specified in the notice. (a) the determination were an assessment, and (b) the amount determined were income tax charged on the contractor, (a) the contractor must make the deduction required by section 61 of the Act from the contract payment or the part of the contract payment, to which the dispute relates, and the amount so deducted is treated as a sum which he is liable to pay to the Commissioners for Her Majesty’s Revenue and Customs under these Regulations; and (b) any amount which, on a final determination of the dispute, is shown not to have been so payable is, except where regulation 56 (application by the Commissioners for Her Majesty’s Revenue and Customs of sums deducted under section 61 of the Act) applies, treated as an overpayment of income tax or corporation tax by the sub-contractor.”
“30A. Assessing procedure (1) Except as otherwise provided, all assessments to tax which are not self-assessments shall be made by an officer of the Board. … (3) Notice of any such assessment shall be served on the person assessed and shall state the date on which it is issued and the time within which any appeal against the assessment may be made. (4) After the notice of any such assessment has been served on the person assessed, the assessment shall not be altered except in accordance with the express provisions of the Taxes Acts. ...”
“54. Settling of appeals by agreement (1) Subject to the provisions of this section, where a person gives notice of appeal and, before the appeal is determined by the tribunal, the inspector or other proper officer of the Crown and the appellant come to an agreement, whether in writing or otherwise, that the assessment or decision under appeal should be treated as upheld without variation, or as varied in a particular manner or as discharged or cancelled, the like consequences shall ensue for all purposes as would have ensued if, at the time when the agreement was come to, the tribunal had determined the appeal and had upheld the assessment or decision without variation, had varied it in that manner or had discharged or cancelled it, as the case may be.”
“(3) A determination under this regulation must not include amounts in respect of which a direction under regulation 9(5) has been made and directions under that regulation do not apply to amounts determined under this regulation.”