“There is a venerable principle of tax law to the general effect that there is a public interest in taxpayers paying the correct amount of tax, and it is one of the duties of the Commissioners in exercise of their statutory functions to have regard to that public interest. … For present purposes, however, it is enough to say that the principle still has at least some residual vitality in the context of section 50 [TMA], and if the Commissioners are to fulfil their statutory duty under that section they must in my judgment be free in principle to entertain legal arguments which played no part in reaching the conclusions set out in the closure notice. Subject always to the requirements of fairness and proper case management, such fresh arguments may be advanced by either side, or may be introduced by the Commissioners on their own initiative. That is not to say, however, that an appeal against a closure notice opens the door to a general roving inquiry into the relevant tax return. The scope and subject matter of the appeal will be defined by the conclusions stated in the closure notice and by the amendments (if any) made to the return.” 16. In addition to this “venerable principle”, Union Castle relies on s 50(6) TMA (which provides that if the Tribunal decides that an appellant is overcharged by a self-assessment it “shall be reduced accordingly”) and the general case management powers contained in Rule 5, particularly Rule 5(2), of theTribunal Procedure (First-tier Tribunal) (Tax Chamber) Rules 2009 (the “FTT Rules”) under which: The Tribunal may give a direction in relation to the conduct or disposal of proceedings at any time including a direction amending, suspending or setting aside an earlier direction. This, Union Castle contends, gives the Tribunal the power to determine the remitted matters in light of the decision of the Court of Appeal in accordance with the overriding objective of the FTT Rules to deal with cases “fairly and justly” (see Rule 2 FTT Rules). 17. While the Tribunal clearly has such power, as Henderson J observed in Tower , this is subject to the requirements of “fairness and proper case management”
“… the law on pleadings is clear: the appellant must state what are its grounds of appeal. If it does not, it cannot rely on those grounds. And if it wants to rely on a new ground of appeal, as it does here, it must apply for permission to amend. And Quah and Denley set out the principles the Tribunal will consider in determining such an application.”