“ [ 28A Completion of enquiry into personal … [[(1) This section applies in relation to an enquiry under section 9A(1) or 12ZM of this Act. (1A) … (1B) The enquiry is completed when an officer of Revenue and Customs informs the taxpayer by notice (a “final closure notice”)— (a) in a case where no partial closure notice has been given, that the officer has completed his enquiries, … (2) A [partial or final closure notice] must [state the officer's conclusions and]— (a) state that in the officer's opinion no amendment of the return is required, or (b) make the amendments of the return required to give effect to his conclusions. (3) A [partial or final closure notice] takes effect when it is issued. … [(7) In this section “the taxpayer” means the person to whom notice of enquiry was given.”
“[29 Assessment where loss of tax discovered] [(1) If an officer of the Board or the Board discover, as regards any person (the taxpayer) and a year of assessment— (a) that any income which ought to have been assessed to income tax, or chargeable gains which ought to have been assessed to capital gains tax, have not been assessed, or … the officer or, as the case may be, the Board may, subject to subsections (2) and (3) below, make an assessment in the amount, or the further amount, which ought in his or their opinion to be charged in order to make good to the Crown the loss of tax. (2) Where— (a) the taxpayer has made and delivered a return under section 8 or 8A of this Act in respect of the relevant year of assessment, and … (3) Where the taxpayer has made and delivered a return under section 8 or 8A of this Act in respect of the relevant year of assessment, he shall not be assessed under subsection (1) above— (a) in respect of the year of assessment mentioned in that subsection; and (b) . . .in the same capacity as that in which he made and delivered the return, unless one of the two conditions mentioned below is fulfilled. (4) The first condition is that the situation mentioned in subsection (1) above was brought about carelessly or deliberately by the taxpayer or a person acting on his behalf. (5) The second condition is that at the time when an officer of the Board— (a) ceased to be entitled to give notice of his intention to enquire into the taxpayer's return under section 8 or 8A of this Act in respect of the relevant year of assessment; or [(b) in a case where a notice of enquiry into the return was given— (i) issued a partial closure notice as regards a matter to which the situation mentioned in subsection (1) above relates, or (ii) if no such partial closure notice was issued, issued a final closure notice,] the officer could not have been reasonably expected, on the basis of the information made available to him before that time, to be aware of the situation mentioned in subsection (1) above. … (b) any reference in paragraphs (b) to (d) to the taxpayer includes a reference to a person acting on his behalf. … (8) An objection to the making of an assessment under this section on the ground that neither of the two conditions mentioned above is fulfilled shall not be made otherwise than on an appeal against the assessment. (9) Any reference in this section to the relevant year of assessment is a reference to— (a) in the case of the situation mentioned in paragraph (a) or (b) of subsection (1) above, the year of assessment mentioned in that subsection; and (b) in the case of the situation mentioned in paragraph (c) of that subsection, the year of assessment in respect of which the claim was made.”
“50 Procedure (1)–(5) . . . [(6) If, on an appeal notified to the tribunal, the tribunal decides— (a) that, . . ., the appellant is overcharged by a self-assessment; (b) that, . . ., any amounts contained in a partnership statement are excessive; or (c) that the appellant is overcharged by an assessment other than a self-assessment, the assessment or amounts shall be reduced accordingly, but otherwise the assessment or statement shall stand good.”
“We have reached the point wherein I am needing to make a best judgement assessment as to the amount of tax that you have failed to declare to HMRC. In addition I also need decide (sic) as to what extent you have made yourself liable to a penalty or penalties.”
“When, in para 7(b) of the Case Stated, the Commissioners state that (with certain exceptions) the Inspector's figures were 'fair", that is, in my judgment, precisely and exactly what they ought to be - fair. The fact that the onus is on the taxpayer to displace the assessment is not intended to give the Crown carte blanche to make wild or extravagant claims. Where an inference, of whatever nature, falls to be made, one invariably speaks of a "fair" inference. Where, as is the case in this matter, figures have to be inferred, what has to be made is a "fair" inference as to what such figures may have been. The figures themselves must be fair.”
“Indeed, it is quite impossible to see how the Crown, in cases of this kind, could do anything else but attempt to draw inferences. The true facts are known, presumably, if known at all, to one person only - the Appellant himself. If once it is clear that he has not put before the tax authorities the full amount of his income, as on the quite clear inferences of fact to be made in the present case he has not, what can then be done? Of course all estimates are unsatisfactory; of course they will always be open to challenge in points of detail; and of course they may well be under-estimates rather than over-estimates as well. But what the Crown has to do in such a situation is, on the known facts, to make reasonable inferences.”
“(2) A [partial or final closure notice] 4 must [state the officer's conclusions and] 5 – (a) state that in the officer's opinion no amendment of the return is required, or (b) make the amendments of the return required to give effect to his conclusions.”
“29. — Assessment where loss of tax discovered. (1) If an officer of the Board or the Board discover, as regards any person (the taxpayer) and a [year of assessment] 2 — (a) that any [ income … 4 which ought to have been assessed to income tax,… 3 have not been assessed, or (b) that an assessment to tax is or has become insufficient, or (c) … the officer or, as the case may be, the Board may, subject to subsections (2) and (3) below, make an assessment in the amount, or the further amount, which ought in his or their opinion to be charged in order to make good to the Crown the loss of tax. ”
“The officer is to make an assessment to the best of his judgment against a person who is in default as regards supplying information. He must not act dishonestly, or vindictively or capriciously, because he must exercise judgment in the matter. He must make what he honestly believes to be a fair estimate of the proper figure of assessment, and for this purpose he must, their Lordships think, be able to take into consideration local knowledge and repute in regard to the assessee's circumstances, and his own knowledge of previous returns by and assessments of the assessee, and all other matters which he thinks will assist him in arriving at a fair and proper estimate: and though there must necessarily be guesswork in the matter, it must be honest guess-work.”
“16.. In Rahman v Customs & Excise Commissioners[1998] STC 826 , I drew attention to phrases used by Woolf J in the leading case under this Act ( Van Boeckel v Customs & Excise Commissioners[1981] STC 290 ) and in previous authorities in other tax contexts, to explain the effect of the “best of their judgment” requirement: “The passages I have underlined show that the Tribunal should not treat an assessment as invalid merely because they disagree as to how the judgment should have been exercised. A much stronger finding is required: for example, that the assessment has been reached ‘dishonestly or vindictively or capriciously’; or is a ‘spurious estimate or guess in which all elements of judgment are missing’; or is ‘wholly unreasonable’. … Short of such a finding, there is no justification for setting aside the assessment.”
“the relevant question is whether the mistake is consistent with an honest and genuine attempt to make a reasoned assessment of the VAT payable; or is of such a nature that it compels the conclusion that no officer seeking to exercise best judgment could have made it. Or there may be no explanation; in which case the proper inference may be that the assessment was indeed arbitrary .”
“Even if the process of assessment is found defective in some respect applying the Rahman (2) test, the question remains whether the defect is so serious or fundamental that justice requires the whole assessment to be set aside, or whether justice can be done simply by correcting the amount to what the Tribunal finds to be a fair figure on the evidence before it. In the latter case, the Tribunal is not required to treat the assessment as a nullity, but should amend it accordingly.”