DT: Luxembourg: double taxation agreement, Article 13: Capital gains
(1) Gains from the alienation of immovable property, as defined in paragraph (2) of Article 6, may be taxed in the Contracting State in which such property is situated.
(2) Gains from the alienation of movable property forming part of the business property of a permanent establishment which an enterprise of a Contracting State has in the other Contracting State, or of movable property pertaining to a fixed base available to a resident of a Contracting State in the other Contracting State for the purpose of performing professional services, including such gains from the alienation of such a permanent establishment (alone or together with the whole enterprise) or of such a fixed base, may be taxed in the other State. However, gains from the alienation of movable property of the kind referred to in paragraph (3) of Article 23 shall be taxable only in the Contracting State in which such movable property is taxable according to the said Article.
(3) Gains from the alienation of any property other than those mentioned in paragraphs (1) and (2) shall be taxable only in the Contracting State of which the alienator is a resident.