“ 9A Notice of enquiry (1) An officer of the Board may enquire into a return under section 8 or 8A of this Act if he gives notice of his intention to do so (“notice of enquiry”)— (a) to the person whose return it is (“the taxpayer”), (b) within the time allowed. ... (4) An enquiry extends to— (a) anything contained in the return, or required to be contained in the return, including any claim or election included in the return, (b) consideration of whether to give the taxpayer a transfer pricing notice under section 168(1) of TIOPA 2010 (provision not at arm's length: medium-sized enterprise), (c) consideration of whether to give the taxpayer a notice under section 81(2) of TIOPA 2010 (notice to counteract scheme or arrangement designed to increase double taxation relief), but this is subject to the following limitation. (5) If the notice of enquiry is given as a result of an amendment of the return under section 9ZA of this Act— (a) at a time when it is no longer possible to give notice of enquiry under subsection (2)(a) or (b) above, … (b) after a final closure notice has been issued in relation to an enquiry into the return, or (c) after a partial closure notice has been issued in such an enquiry in relation to the matters to which the amendment relates or which are affected by the amendment, the enquiry into the return is limited to matters to which the amendment relates or which are affected by the amendment. (6) In this section “the filing date” means, in relation to a return, the last day for delivering it in accordance with section 8 or 8A. … 42 Procedure for making claims etc. (1) Where any provision of the Taxes Acts provides for relief to be given, or any other thing to be done, on the making of a claim, this section shall, unless otherwise provided, have effect in relation to the claim. (1A) Subject to subsection (3) below, a claim for a relief, an allowance or a repayment of tax shall be for an amount which is quantified at the time when the claim is made. (2) Subject to subsections (3) to (3ZC) below, where notice has been given under section 8, 8A or 12AA of this Act, a claim shall not at any time be made otherwise than by being included in a return under that section if it could, at that or any subsequent time, be made by being so included. … (5) The reference in this section to a claim being included in a return include references to a claim being so included by virtue of an amendment of the return. … (10) This section (except subsection (1A) above and subject to subsection (10A) below) shall apply in relation to any elections as it applies in relation to claims. … (11) Schedule 1A to this Act shall apply as respects any claim or election which— (a) is made otherwise than by being included in a return under section 8, 8A, 12ZB or 12AA of this Act, … (11A) Schedule 1B to this Act shall have effect as respects certain claims for relief involving two or more years of assessment. (13) In this section 'profits' — (a) in relation to income tax, means income, and (b) in relation to capital gains tax, means chargeable gains. … Schedule 1A 1. In this Schedule— 'claim' means a claim or election as respects which this Schedule applies; … 4. (1) Subject to sub-paragraphs (1A), (3) to (5) below, an officer of the Board or the Board shall, as soon as practicable after a claim other than a partnership claim is made, or such a claim is amended under paragraph 3 above, give effect to the claim or amendment by discharge or repayment of tax. ... (3) Where any such claim or amendment as is mentioned in sub-paragraph (1) or (2) above is enquired into by an officer of the Board— (a) that sub-paragraph shall not apply until the day on which, by virtue of paragraph 7(1) below, the enquiry is completed; but (b) the officer may at any time before that day give effect to the claim or amendment, on a provisional basis, to such extent as he thinks fit. (4) Nothing in this paragraph applies in relation to a claim or an amendment of a claim if the claim is not one for discharge or repayment of tax. (5) This paragraph has effect subject to any provision in the Taxes Acts that— (a) requires or allows effect to be given to a claim by other means, or (b) provides that an amount is not to be discharged or repaid. 5. (1) An officer of the Board may enquire into— (a) a claim made by any person, or (b) any amendment made by any person of a claim made by him, if, before the end of the period mentioned in sub-paragraph (2) below, he gives notice in writing of his intention to do so to that person or, in the case of a partnership claim, any successor of that person. …”
“ 23 The calculation of income tax liability To find the liability of a person (“the taxpayer”) to income tax for a tax year, take the following steps. Step 1 Identify the amounts of income on which the taxpayer is charged to income tax for the tax year. The sum of those amounts is “total income”