Kesepakatan tersebut ditandatangani di London pada tanggal 6 Desember 1921, oleh perwakilan pemerintah Britania Raya (termasuk Perdana Menteri David Lloyd George, yang merupakan kepala delegasi Britania Raya) dan oleh perwakilan Republik Irlandia termasuk Michael Collins dan Arthur Griffith.
↑Irish Free State (Agreement) Act 1922 whose full title is "An Act to give the force of Law to certain Articles of Agreement for a Treaty between Great Britain and Ireland, and to enable effect to be given thereto, and for other purposes incidental thereto or consequential thereon."–and which was given Royal Assent on 31 March 1922