Switzerland: double taxation agreement, Article 26: Diplomatic agents and consular officers
(1) Nothing in this Convention shall affect the fiscal privileges of diplomatic agents or consular officers under the general rules of international law or under the provisions of special agreements.
(2) Notwithstanding the provisions of Article 4 an individual who is a member of a diplomatic mission, consular post or permanent mission of a Contracting State which is situated in the other Contracting State or in a third State may be deemed for the purpose of the Convention to be a resident of the sending State if:
(a) in accordance with international law he is not liable to tax in the receiving State in respect of income from sources outside that State, and
(b) he is liable in the sending State to the same obligations in relation to tax on his total income as are residents of that State.
(3) The Convention shall not apply to international organisations, to organs or officials thereof and to persons who are members of a diplomatic mission, consular post or permanent mission of a third State, being present in a Contracting State and not treated in either Contracting State as residents in respect of taxes on income.