“12 (1) The Inland Revenue may enquire into a land transaction return if they give notice of their intention to do so (“notice of enquiry”)— (a) to the purchaser, (b) before the end of the enquiry period. (2) The enquiry period is the period of nine months— (a) after the filing date, if the return was delivered on or before that date; (b) after the date on which the return was delivered, if the return was delivered after the filing date; (c) after the date on which the amendment was made, if the return is amended under paragraph 6 (amendment by purchaser). … 28 (1) If the Inland Revenue discover as regards a chargeable transaction that— (a) an amount of tax that ought to have been assessed has not been assessed, or (b) an assessment to tax is or has become insufficient, or (c) relief has been given that is or has become excessive, they may make an assessment (a “discovery assessment”) in the amount or further amount that ought in their opinion to be charged in order to make good to the Crown the loss of tax. (2) The power to make a discovery assessment in respect of a transaction for which the purchaser has delivered a return is subject to the restrictions specified in paragraph 30. … 30 (1) If the purchaser has delivered a land transaction return in respect of the transaction in question, an assessment under paragraph 28 or 29 in respect of the transaction— (a) may only be made in the two cases specified in sub-paragraphs (2) and (3) below, and (b) may not be made in the circumstances specified in sub-paragraph (5) below. (2) The first case is where the situation mentioned in paragraph 28(1) or 29(1) is attributable to fraudulent or negligent conduct on the part of— (a) the purchaser, (b) a person acting on behalf of the purchaser, or (c) a person who was a partner of the purchaser at the relevant time. (3) The second case is where the Inland Revenue, at the time they— (a) ceased to be entitled to give a notice of enquiry into the return, or (b) completed their enquiries into the return, could not have been reasonably expected, on the basis of the information made available to them before that time, to be aware of the situation mentioned in paragraph 28(1) or 29(1). (4) For this purpose information is regarded as made available to the Inland Revenue if— (a) it is contained in a land transaction return made by the purchaser, (b) it is contained in any documents produced or information provided to the Inland Revenue for the purposes of an enquiry into any such return, or (c) it is information the existence of which, and the relevance of which as regards the situation mentioned in paragraph 28(1) or 29(1)— (i) could reasonably be expected to be inferred by the Inland Revenue from information falling within paragraphs (a) or (b) above, or (ii) are notified in writing to the Inland Revenue by the purchaser or a person acting on his behalf. (5) No assessment may be made if— (a) the situation mentioned in paragraph 28(1) or 29(1) is attributable to a mistake in the return as to the basis on which the tax liability ought to have been computed, and (b) the return was in fact made on the basis or in accordance with the practice generally prevailing at the time it was made.”
“31(1) The general rule is that no assessment may be made more than 4 years after the effective date of the transaction to which it relates. (2) An assessment of a person to tax in a case involving a loss of tax brought about carelessly by the purchaser or a related person may be made at any time not more than 6 years after the effective date of the transaction to which it relates (subject to sub-paragraph (2A)).”
“Where an Act authorises or requires any document to be served by post (whether the expression “serve” or the expression “give” or “send” or any other expression is used) then, unless the contrary intention appears, the service is deemed to be effected by properly addressing, pre-paying and posting a letter containing the document and, unless the contrary is proved, to have been effected at the time at which the letter would be delivered in the ordinary course of post.”
“37. 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, 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. If an officer has concluded that a discovery assessment should be issued, but for some reason the assessment is not made within a reasonable period after that conclusion is reached, it might, depending on the circumstances, be the case that the conclusion would lose its essential newness by the time of the actual assessment. But that would not, in our view, include a case, such as this, where the delay was merely to accommodate the final determination of another appeal which was material to the liability question. Such a delay did not deprive Mr Cree's conclusions of their essential newness for s 29(1) purposes.”
“61. I agree with the UT’s approach in both passages. The requirement for the conclusion to have “newly appeared” is implicit in the statutory language “discover”
“79. A taxpayer who makes a completely full and frank disclosure achieves certainty at the end of the enquiry window or on completion of the enquiry. A taxpayer who makes a non-negligent partial disclosure may have to wait a few more years. That is not an unfair balance. And it is also one which is sufficiently precisely formulated to enable a taxpayer to regulate his conduct so as to be able to foresee to a reasonable extent the consequences of his actions: those precise consequences might depend upon the diligence or otherwise of HMRC but he knows that, depending on his course of conduct, there will come a time within a not unreasonable period when a liability is no longer capable of assessment.”
“99. The leading cases on the application of s29(5) are now Hankinson , Lansdowne and Sanderson . We were referred to these cases by the parties. We will refer predominantly to the decision of the Court of Appeal in Sanderson and the leading judgment of Patten LJ as in it he set out a summary of the relevant principles which incorporates relevant extracts from the decisions in the other cases. The relevant passage is at [17] to [23] of his judgment. We will not set it out in this decision. 100. We endeavour to summarise the principles that we derive from Patten LJ’s judgment as follows: (1) The test in s29(5) is applied by reference to a hypothetical HMRC officer not the actual officer in the case. The officer has the characteristics of an officer of general competence, knowledge or skill which include a reasonable knowledge and understanding of the law. (2) The test requires the court or tribunal to identify the information that is treated by s29(6) as available to the hypothetical officer at the relevant time and determine whether on the basis of that information the hypothetical officer applying that level of knowledge and skill could not have been reasonably expected to be aware of the insufficiency. (3) The hypothetical officer is expected to apply his knowledge of the law to the facts disclosed to form a view as to whether or not an insufficiency exists (Moses LJ, Lansdowne [69]; Patten LJ, Sanderson [23]). We agree therefore with Mr Firth that the test does assume that the hypothetical officer will apply the appropriate level of knowledge and skill to the information that is treated as being available before the level of awareness is tested. The test does not require that the actual insufficiency is identified on the face of the return. (4) But the question of the knowledge of the hypothetical officer cuts both ways. He or she is not expected to resolve every question of law particularly in complex cases (Patten LJ, Sanderson [23], Lansdowne [69]). In some cases, it may be that the law is so complex that the inspector could not reasonably have been expected to be aware of the insufficiency (Moses LJ, Lansdowne [69]; Patten LJ, Sanderson [17(3)]). (5) The hypothetical officer must be aware of the actual insufficiency from the information that is treated as available by s29(6) (Auld LJ, Langham v Veltema [33] [34]; Patten LJ, Sanderson [22]). The information need not be sufficient to enable HMRC to prove its case (Moses LJ, Lansdowne [69]) but it must be more than would prompt the hypothetical officer to raise an enquiry (Auld LJ, Langham v Veltema [33]; Patten LJ, Sanderson [35]). (6) As can be seen from the discussion in Sanderson (see [23]), the level of awareness is a question of judgment not a particular standard of proof (see also Moses LJ in Lansdowne [70]). The information made available must “justify” raising the additional assessment (Moses LJ, Lansdowne [69]) or be sufficient to enable HMRC to make a decision whether to raise an additional assessment (Lewison J in the High Court in Lansdowne[2011] STC 372 at [48]).”