“…the concept of a "discovery" by an officer involves the application of a subjective test, as to the officer's state of mind, and an objective test as to whether it is open to an officer to have that state of mind.”
“The officer must believe that the information available to [them] points in the direction of there being an insufficiency of tax.”
“The officer’s decision to make a discovery assessment is an administrative decision. We consider that the objective controls on the decision making of the officer should be expressed by reference to public law concepts. Accordingly, as regards the requirement for the action to be ‘reasonable’, this should be expressed as a requirement that the officer’s belief is one which a reasonable officer could form. It is not for a tribunal hearing an appeal in relation to a discovery assessment to form its own belief on the information available to the officer and then to conclude, if it forms a different belief, that the officer’s belief was not reasonable.”
“Even supposing that I were myself to think that the amounts were wrong – and, as I have freely conceded, and as [Counsel for the Revenue] has freely conceded, they probably are wrong – what on earth could I or anybody else at this stage, in the total absence of evidence, substitute for them? The answer is that it is a complete and utter impossibility; and that is why, of course, the Taxes Management Act throws upon the taxpayer the onus of showing that the assessments are wrong. It is the taxpayer who knows and the taxpayer who is in a position (or, if not in a position, who certainly should be in a position) to provide the right answer, and chapter and verse for the right answer, and it is idle for any taxpayer to say to the Revenue, “Hidden somewhere in your vaults are the right answers: go thou and dig them out of the vaults.”