(1) Subject to the provisions of paragraph (2) of Article 18, pensions and other similar remuneration in consideration of past employment paid to a resident of a Contracting State shall be taxable only in that State.

(2) Notwithstanding the provisions of paragraph (1), and subject to the provisions of paragraph (2) of Article 18, pensions paid and other benefits, whether periodic or lumpsum compensation, awarded under the social security legislation of a Contracting State or under any public scheme organised by a Contracting State for social welfare purposes, or any annuity arising in a Contracting State, may be taxed in that State.

(3) The term "annuity" as used in this Article means a stated sum payable periodically to an individual at stated times during his life, or during a specified or ascertainable period of time, under an obligation to make the payments in return for adequate and full consideration in money or money's worth (other than services rendered).