DT: Tunisia: double taxation agreement, Article 19: Governmental functions
(a) Remuneration, other than a pension, paid by a Contracting State or a political subdivision or a local authority thereof to an individual in respect of services of a governmental nature rendered to that State or subdivision or authority shall be taxable only in that State.
(b) However, such remuneration shall be taxable only in the other Contracting State if the services are rendered in that State and the individual is a resident of that State who:
(i) is a national of that State; or
(ii) did not become a resident of that State solely for the purpose of rendering the services.
(2) The provisions of Articles 15 and 16 shall apply to remuneration in respect of services rendered in connection with a business carried on by a Contracting State or apolitical subdivision or local authority thereof.