26 U.S.C. § 882: Tax on income of foreign corporations connected with United States business

A foreign corporation engaged in trade or business within the United States during the taxable year shall be taxable as provided in section 11, 55, or 59A, 1 on its taxable income which is effectively connected with the conduct of a trade or business within the United States. 1 So in original. The comma probably should not appear. In determining taxable income for purposes of paragraph (1), gross income includes only gross income which is effectively connected with the conduct of a trade or business within the United States. For special tax treatment of gain or loss from the disposition by a foreign corporation of a United States real property interest, see section 897. gross income which is derived from sources within the United States and which is not effectively connected with the conduct of a trade or business within the United States, and gross income which is effectively connected with the conduct of a trade or business within the United States. In the case of a foreign corporation, the deductions shall be allowed only for purposes of subsection (a) and (except as provided by subparagraph (B)) only if and to the extent that they are connected with income which is effectively connected with the conduct of a trade or business within the United States; and the proper apportionment and allocation of the deductions for this purpose shall be determined as provided in regulations prescribed by the Secretary. The deduction for charitable contributions and gifts provided by section 170 shall be allowed whether or not connected with income which is effectively connected with the conduct of a trade or business within the United States. A foreign corporation shall receive the benefit of the deductions and credits allowed to it in this subtitle only by filing or causing to be filed with the Secretary a true and accurate return, in the manner prescribed in subtitle F, including therein all the information which the Secretary may deem necessary for the calculation of such deductions and credits. The preceding sentence shall not apply for purposes of the tax imposed by section 541 (relating to personal holding company tax), and shall not be construed to deny the credit provided by section 33 for tax withheld at source or the credit provided by section 34 for certain uses of gasoline. Except as provided by section 906, foreign corporations shall not be allowed the credit against the tax for taxes of foreign countries and possessions of the United States allowed by section 901. For rule that certain foreign taxes are not to be taken into account in determining deduction or credit, see section 906(b)(1). from real property located in the United States, or from any interest in such real property, including (i) gains from the sale or exchange of real property or an interest therein, (ii) rents or royalties from mines, wells, or other natural deposits, and (iii) gains described in section 631(b) or (c), and which, but for this subsection, would not be treated as income effectively connected with the conduct of a trade or business within the United States, Paragraphs (2) and (3) of section 871(d) shall apply in respect of elections under this subsection in the same manner and to the same extent as they apply in respect of elections under section 871(d). for purposes of this subpart, be treated as income which is effectively connected with the conduct of a trade or business within the United States, and shall be taxable as provided in subsection (a)(1) whether or not such corporation is engaged in trade or business within the United States during the taxable year. If any foreign corporation has no office or place of business in the United States but has an agent in the United States, the return required under section 6012 shall be made by the agent.