“In our judgment, no new information, of fact or law, is required for there to be a discovery. All that is required is that it has newly appeared to an officer, acting honestly and reasonably, that there is an insufficiency in an assessment. That can be for any reason, including a change of view, a change of opinion, or correction of an oversight. The requirement for newness does not relate to the reason for the conclusion reached by the officer, but to the conclusion itself...”
“The courts are ever mindful that their constitutional role in this field is interpretative. They must abstain from any course which might have the appearance of judicial legislation. A statute is expressed in language approved and enacted by the legislature. So the courts exercise considerable caution before adding or omitting or substituting words. Before interpreting a statute in this way the court must be abundantly sure of three matters: (1) the intended purpose of the statute or provision in question; (2) that by inadvertence the draftsman and Parliament failed to give effect to that purpose in the provision in question; and (3) the substance of the provision Parliament would have made, although not necessarily the precise words Parliament would have used, had the error in the Bill been noticed. The third of these conditions is of crucial importance. Otherwise any attempt to determine the meaning of the enactment would cross the boundary between construction and legislation ...”
“ The role of the court in correcting anomalies created by the literal wording of tax legislation has been considered on many occasions. In Jenks v Dickinson (HM Inspector of Taxes)[1997] STC 853 , Neuberger J cited passages from earlier authorities including Mangin v Inland Revenue Commissioner[1971] AC 739 where Lord Donovan had said that the object of the construction of the statute being to ascertain the will of the legislature, it may be presumed that neither injustice nor absurdity was intended. If therefore a literal interpretation would produce such a result, and the language admits of an interpretation which would have avoided it, then such an interpretation may be adopted. Further the history of an enactment and the reasons which led to it being passed may be used as an aid to its construction...”
“67. Applying the three-stage approach set down in Inco Europe: (1) We are abundantly sure that the intended purpose of s 29(1)(a) TMA 1970 is to allow HMRC to make good a loss of tax to the exchequer where under-assessed tax is discovered. The intended purpose of s 36 TMA 1970 is to allow HMRC 20 years to issue assessments where chargeability (including to HICBC) has not been notified as required by s 7 TMA 1970. (2) We are abundantly sure that Parliament’s failure to amend s 29(1)(a) TMA 1970 so as to include within it the HICBC was due to inadvertence. Having determined that liability to HICBC should be notified to HMRC by way of filing a tax return (and amending s 7 TMA 1970 accordingly), we find it inconceivable that Parliament intended that HMRC be prevented from assessing a taxpayer that failed to comply with that obligation unless and until HMRC issued to that taxpayer a notice to file given that such an approach would lead to the absurdities and injustice referred to … (3) We are abundantly sure that, but for this inadvertence, Parliament would have added to s 29(1)(a) TMA wording to the effect that the HICBC could be assessed under that provision (e.g. by adding in the following underlined words “that any income which ought to have been assessed to income tax, or any high income child benefit charge undersection 681B of the Income Tax (Earnings and Pensions) Act 2003 which ought to have been charged , or chargeable gains which ought to have been assessed to capital gains tax have not been assessed...”).”
“Our most profound doubt is as to whether the statutory language would admit of the interpretation HMRC propose - or indeed any other interpretation that would eliminate the anomaly identified at [50] above. It is in our view impossible to conflate, as HMRC propose in interpreting “income which ought to be assessed” as meaning “amounts which ought to be assessed”, two quite different figures: the figure for the overall income tax liability, and the figure for the income which is adjusted for various matters, and then subjected to a rate of tax, before emerging as an amount of tax due. In our view the statutory language does not admit of such conflation.”