“Chadwick LJ (para 5) noted that the wording of section 83(p) reflected “the two distinct questions” which may arise where an assessment purports to be made under section 73(1): “First, whether the assessment has been made under the power conferred under that section; and, second, whether the amount of the assessment is the correct amount for which the taxpayer is accountable”
“The explanation may be that the tribunal, applying its own judgment to the same underlying material at the second, or ‘quantum’, stage of the appeal, has made different assumptions - say, as to food/drink ratios, wastage or pilferage - from those made by the commissioners. As Woolf J pointed out in Van Boeckel ([1981] STC 290 at 297), that does not lead to the conclusion that the assumptions made by the commissioners were unreasonable; nor that they were outside the margin of discretion inherent in the exercise of judgment in these cases. Or the explanation may be that the tribunal is satisfied that the commissioners have made a mistake - that they have misunderstood or misinterpreted the material which was before them, adopted a wrong methodology or, more simply, made a miscalculation in computing the amount of VAT payable from their own figures. In such cases - of which the present is one - the relevant question is whether the mistake is consistent with an honest and genuine attempt to make a reasoned assessment of the VAT payable; or is of such a nature that it compels the conclusion that no officer seeking to exercise best judgment could have made it. Or there may be no explanation; in which case the proper inference may be that the assessment was indeed arbitrary”. (emphasis added)…”. “First, whether the assessment has been made under the power conferred under that section; and, second, whether the amount of the assessment is the correct amount for which the taxpayer is accountable”. “The explanation may be that the tribunal, applying its own judgment to the same underlying material at the second, or ‘quantum’, stage of the appeal, has made different assumptions - say, as to food/drink ratios, wastage or pilferage - from those made by the commissioners. As Woolf J pointed out in Van Boeckel ([1981] STC 290 at 297), that does not lead to the conclusion that the assumptions made by the commissioners were unreasonable; nor that they were outside the margin of discretion inherent in the exercise of judgment in these cases. Or the explanation may be that the tribunal is satisfied that the commissioners have made a mistake - that they have misunderstood or misinterpreted the material which was before them, adopted a wrong methodology or, more simply, made a miscalculation in computing the amount of VAT payable from their own figures. In such cases - of which the present is one - the relevant question is whether the mistake is consistent with an honest and genuine attempt to make a reasoned assessment of the VAT payable; or is of such a nature that it compels the conclusion that no officer seeking to exercise best judgment could have made it. Or there may be no explanation; in which case the proper inference may be that the assessment was indeed arbitrary”. (emphasis added)…”