Portugal: double taxation agreement, Article 6: Income from immovable property
(1) Income from immovable property may be taxed in the Contracting State in which such property is situated.
(a) The term `immovable property` shall, subject to sub-paragraph (b) below, be defined in accordance with the law of the Contracting State in which the property in question is situated.
(b) The term `immovable property` shall in any case include property accessory to immovable property, livestock and equipment used in agriculture and forestry, rights to which the provisions of general law respecting landed property apply, usufruct of immovable property and rights to variable or fixed payments as consideration for the working of, or the right to work, mineral deposits sources and other natural resources; ships and aircraft shall not be regarded as immovable property.
(3) The provisions of paragraph (1) shall apply to income derived from the direct use, letting, or use in any other form of immovable property. Those provisions shall also apply to income from property which, under the law of the Contracting State in which the property in question is situated, is assimilated to income from immovable property.
(4) The provisions of paragraphs (1) to (3) shall also apply to the income from immovable property of an enterprise and to income from immovable property used for the performance of professional services.