“The element of guesswork and the almost unavoidable inaccuracy in a properly made best of judgment assessment, as the cases have established, do not serve to displace the validity of the assessments, which are prima facie right and remain right until the taxpayer shows that they are wrong and also shows positively what corrections should be made in order to make the assessments right or more nearly right." (Bi−Flex Caribbean Ltd v Board of Inland Revenue (1990) 63 TC 515, 522−3 PC, per Lord Lowry)”
“42. The question is whether it means (i) a deliberate statement which is (in fact) inaccurate or (ii) a statement which, when made, was deliberately inaccurate. If (ii) is correct, it would need to be shown that the maker of the statement knew it to be inaccurate or (perhaps) that he was reckless rather than merely careless or mistaken as to its accuracy. 43. We have no hesitation in concluding that the second of those interpretations is to be preferred, for the following reasons. First, it is the natural meaning of the phrase “deliberate inaccuracy”