ARTICLE 18
Pensions
(1) Subject to the provisions of paragraph (2) of Article 19 pensions and other similar remuneration paid to a resident of a Contracting State in consideration of past employment, and annuity, shall be taxed only in that Contracting State.
(2) Notwithstanding the provisions of paragraph (1) pensions paid and other payments made under public schemes, which are parts of the social security system of a Contracting State, shall be taxable only in that Contracting State.
(3) The term "annuity" means a stated sum payable periodically at stated times during 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.