Tax Appeals Commission is a government administration company based out of Fitzwilliam Court, Leeson Close, Saint Peter's, Dublin, Ireland. The main role of the TAC is to adjudicate, hear and determine appeals against decisions and determinations of the Revenue Commissioners concerning taxes and duties. The specific functions of the Appeal Commissioners are set out in section 6 of the Finance (Tax Appeals) Act 2015. In carrying out their functions, the Appeal Commissioners are obliged to ensure that proceedings before them are accessible, fair and conducted as expeditiously as possible.