“I have referred to the judgment [of Woolf J] in some detail, because 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 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". In substance those tests are indistinguishable from the familiar Wednesbury principles […] Short of such a finding, there is no justification for setting aside the assessment.”
“The statutory words ‘to the best of their judgment' are used in a context where the taxpayers' records may be incomplete, so that a fully informed assessment is unlikely to be possible. Thus the word 'best', rather than implying a higher than normal standard, is a recognition that the result may necessarily involve an element of guesswork. It means simply 'to the best of (their) judgment on the information available’.”
“before we make assessments of tax due, I would like to give you the opportunity to make any further comment to my findings and calculations. If you feel there are other factors for me to consider, please forward details and supporting evidence.”