“Where a person has failed to make any returns required under this Act (or under any provision repealed by this Act) or to keep any documents and afford the facilities necessary to verify such returns or where it appears to the Commissioners that such returns are incomplete or incorrect, they may assess the amount of VAT due from him to the best of their judgment and notify it to him.”
“What the words ‘best of their judgment’ envisage, in my view, is that the Commissioners will fairly consider all material placed before them and, on that material, come to a decision which is one which is reasonable and not arbitrary as to the amount of tax which is due. As long as there is some material on which the Commissioners can reasonably act then they are not required to carry out investigations which may or may not result in further material being placed before them.”
“… there are dangers in taking Woolf J’s analysis of the concept of ‘best judgment’ out of context … the tribunal should not treat an assessment as invalid merely because it disagrees as to how the judgment should have been exercised. A much stronger finding is required; for example, that the assessment had 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’. In substance those tests are indistinguishable from the familiar Wednesbury principles (see Associated Provincial Picture Houses Ltd v Wednesbury Corp[1948] 1 KB 223 ). Short of such a finding, there is no justification for setting aside the assessment.”
“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.”