Portugal: double taxation agreement, Article 7: Business profits
(1) The industrial or commercial profits of an enterprise of a Contracting State shall be taxable only in that State unless the enterprise carries on business in the other Contracting State through a permanent establishment situated therein. If the enterprise carries on business as aforesaid, the industrial or commercial profits of the enterprise may be taxed in the other State but only so much of them as is attributable to that permanent establishment.
(2) Where an enterprise of a Contracting State carries on business in the other Contracting State through a permanent establishment situated therein, there shall in each Contracting State be attributed to that permanent establishment the industrial or commercial profits which it might be expected to make if it were a distinct and separate enterprise engaged in the same or similar activities under the same or similar conditions and dealing at arm’s length with the enterprise of which it is a permanent establishment.
(3) In the determination of the profits of a permanent establishment, there shall be allowed as deductions expenses which are incurred for the purposes of the permanent establishment including executive and general administrative expenses so incurred whether in the State in which the permanent establishment is situated or elsewhere, excluding expenses which would not be deductible if the permanent establishment were a separate enterprise.
(4) No profits shall be attributed to a permanent establishment by reason of the mere purchase by that permanent establishment of goods or merchandise for the enterprise.
(5) The term `industrial or commercial profits` means income derived by an enterprise from the conduct of a trade or business, including income derived by an enterprise from the furnishing of services of employees or other personnel and dividends, interest or royalties effectively connected with a trade or business carried on through a permanent establishment which an enterprise of a Contracting State has in the other Contracting State, but the term does not include dividends, interest or royalties not so connected; nor does it include remuneration for personal (including professional) services.