ARTICLE 18
Pensions, Annuities and Similar Payments
(1) Subject to the provisions of paragraph (2) of Article 19, pensions, whether paid in consideration of past employment or not, and other benefits, whether periodic or lump-sum 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 that State, may be taxed in that State.
(2) The term "annuity" as used in this Article means a stated sum payable periodically at stated times during late, 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.