“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. 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.”
“i) The Tribunal should remember that its primary task is to find the correct amount of tax, so far as possible on the material properly available to it, the burden resting on the taxpayer. In all but very exceptional cases, that should be the focus of the hearing, and the Tribunal should not allow it to be diverted into an attack on the Commissioners exercise of judgment at the time of the assessment. ii) Where the taxpayer seeks to challenge the assessment as a whole on "best of their judgment" grounds, it is essential that the grounds are clearly and fully stated before the hearing begins. iii) In particular the Tribunal should insist at the outset that any allegation of dishonesty or other wrongdoing against those acting for the Commissioners should be stated unequivocally; that the allegation and the basis for it should be fully particularised; and that it is responded to in writing by the Commissioners. The Tribunal should not in any circumstances allow cross-examination of the Customs officers concerned, until that is done.”