21. —F56[(1) If an Irish citizen of full age is or is about to become a citizen of another country and for that reason desires to renounce citizenship, he or she may do so, if ordinarily resident outside the State, by lodging with the Minister a declaration of alienage in the prescribed manner, and, upon lodgment of the declaration or, if not then a citizen of that country, upon becoming such, shall cease to be an Irish citizen.]

(2) An Irish citizen may not, except with the consent of the Minister, renounce Irish citizenship under this section during a time of war as defined in Article 28.3.3° of the Constitution.