“ 85. Settling appeals by agreement (1) Subject to the provisions of this section, where a person gives notice of appeal under section 83 and, before the appeal is determined by a tribunal, HMRC and the appellant come to an agreement (whether in writing or otherwise) under the terms of which the decision under appeal is to be treated— (a) as upheld without variation, or (b) as varied in a particular manner, or (c) as discharged or cancelled, the like consequences shall ensue for all purposes as would have ensued if, at the time when the agreement was come to, a tribunal had determined the appeal in accordance with the terms of the agreement. (2) Subsection (1) above shall not apply where, within 30 days from the date when the agreement was come to, the appellant gives notice in writing to HMRC that he desires to repudiate or resile for the agreement. … (4) Where— (a) a person who has given a notice of appeal notifies HMRC, whether orally or in writing, that he desires not to proceed with the appeal; and (b) 30 days have elapsed since the giving of the notification without HMRC giving to the appellant notice in writing indicating that they are unwilling that the appeal should be treated as withdrawn, the preceding provisions of this section shall have effect as if, at the date of the appellant's notification, the appellant and HMRC had come to an agreement, orally or in writing, as the case may be, that the decision under appeal should be upheld without variation. (5) References in this section to an agreement being come to with an appellant and the giving of notice or notification to or by an appellant include references to an agreement being come to with, and the giving of notice or notification to or by, a person acting on behalf of the appellant in relation to the appeal.”
“ 17. Withdrawal (1) Subject to any provision in an enactment relating to withdrawal or settlement of particular proceedings , a party may give notice to the Tribunal of the withdrawal of the case made by it in the Tribunal proceedings, or any part of that case— (a) by sending or delivering to the Tribunal a written notice of withdrawal; or (b) orally at a hearing. (2) The Tribunal must notify each party in writing of its receipt of a withdrawal under this rule. (3) A party who has withdrawn their case may apply to the Tribunal for the case to be reinstated.
“Dear Jessica I confirm that the attached appeals and all the appeals related to this matter are withdrawn. By virtue of its Insolvenct [sic], the Company is no longer in a position to represent itself at these proceedings. The Liquidator therefore has no intention to progress with these appeals.”
“Two features of Rule 17 are readily apparent. The first is that it provides for the withdrawal (and reinstatement) of a party’s case, but it does not provide for the consequences of withdrawal. The second is that it is expressly subject to statutory provisions relating to both withdrawal and settlement. It is to those statutory consequences that we must look to determine the consequence of withdrawal.”
“Rule 17 is entirely compatible with that analysis. Not only is it expressly subject to statutory provisions relating to withdrawal or settlement (of which s 54 is plainly one), and says nothing itself about the consequences of withdrawal, it is also drafted in terms that it is the case of the party seeking to withdraw that is the subject of the withdrawal. Where it is the appellant who withdraws, that does not necessarily mean that the whole of the proceedings must be regarded as having come to an end. The proceedings remain to be determined, whether as a matter of statute, as for example, where HMRC do not object, by a combination of s 54(4) and s 54(1) , or by a decision by the tribunal, which in relevant circumstances will include consideration of whether the appellant has been undercharged and the assessment should be increased accordingly.” (Emphasis supplied.)
“33. Once agreement has been reached in writing (or has been confirmed in writing), then section 54 TMA is engaged and the only statutorily permissible means of cancelling that agreement is through the “cooling off” provisions of section 54(2) TMA. It is common ground that no notice was given within 30 days under that sub-section purporting to repudiate or resile from the agreement and accordingly we find that section 54(1) applies to this agreement. Thus, so far as the income tax and NIC amendment/assessments are concerned, “the like consequences shall ensue for all purposes as would have ensued if, at the time when the agreement was come to, the tribunal had determined the appeal and had... varied it...” in the manner agreed. 34. This means that, for the purposes of the Appellant’s application to “reinstate” the part of his appeal that relates to the income tax and NIC amendment/assessments, we are required to assume that the Tribunal has already determined that part of the appeal on the basis agreed. In such a case, the doctrine of res judicata means that it would be an abuse of the Tribunal’s process to permit the appeal to be re-opened, because the Tribunal would thereby be allowing the parties to re-litigate an appeal which had already been deemed by statute to have been determined on an agreed basis.”