26 U.S.C. § 881: Tax on income of foreign corporations not connected with United States business

interest (other than original issue discount as defined in section 1273), dividends, rents, salaries, wages, premiums, annuities, compensations, remunerations, emoluments, and other fixed or determinable annual or periodical gains, profits, and income, gains described in section 631(b) or (c), a sale or exchange of an original issue discount obligation, the amount of the original issue discount accruing while such obligation was held by the foreign corporation (to the extent such discount was not theretofore taken into account under subparagraph (B)), and a payment on an original issue discount obligation, an amount equal to the original issue discount accruing while such obligation was held by the foreign corporation (except that such original issue discount shall be taken into account under this subparagraph only to the extent such discount was not theretofore taken into account under this subparagraph and only to the extent that the tax thereon does not exceed the payment less the tax imposed by paragraph (1) thereon), and gains from the sale or exchange after October 4, 1966 , of patents, copyrights, secret processes and formulas, good will, trademarks, trade brands, franchises, and other like property, or of any interest in any such property, to the extent such gains are from payments which are contingent on the productivity, use, or disposition of the property or interest sold or exchanged, at all times during such taxable year less than 25 percent in value of the stock of such corporation is beneficially owned (directly or indirectly) by foreign persons, at least 65 percent of the gross income of such corporation is shown to the satisfaction of the Secretary to be effectively connected with the conduct of a trade or business in such a possession or the United States for the 3-year period ending with the close of the taxable year of such corporation (or for such part of such period as the corporation or any predecessor has been in existence), and no substantial part of the income of such corporation is used (directly or indirectly) to satisfy obligations to persons who are not bona fide residents of such a possession or the United States. created or organized in, or under the law of, the Commonwealth of Puerto Rico, and with respect to which the requirements of subparagraphs (A), (B), and (C) of paragraph (1) are met for the taxable year, If, on or after the date of the enactment of this paragraph, an increase in the rate of the Commonwealth of Puerto Rico’s withholding tax which is generally applicable to dividends paid to United States corporations not engaged in a trade or business in the Commonwealth to a rate greater than 10 percent takes effect, this paragraph shall not apply to dividends received on or after the effective date of the increase. a United States person, or a person who would be a United States person if references to the United States in section 7701 included references to a possession of the United States. For purposes of paragraph (1), the rules of section 318(a)(2) shall apply except that “5 percent” shall be substituted for “50 percent” in subparagraph (C) thereof. In the case of any portfolio interest received by a foreign corporation from sources within the United States, no tax shall be imposed under paragraph (1) or (3) of subsection (a). would be subject to tax under subsection (a) but for this subsection, and which is in registered form, and the person who would otherwise be required to deduct and withhold tax from such interest under section 1442(a) receives a statement which meets the requirements of section 871(h)(5) that the beneficial owner of the obligation is not a United States person, or the Secretary has determined that such a statement is not required in order to carry out the purposes of this subsection. except in the case of interest paid on an obligation of the United States, is received by a bank on an extension of credit made pursuant to a loan agreement entered into in the ordinary course of its trade or business, is received by a 10-percent shareholder (within the meaning of section 871(h)(3)(B)), or is received by a controlled foreign corporation from a related person (within the meaning of section 864(d)(4)). For purposes of this subsection, the term “portfolio interest” shall not include any interest which is treated as not being portfolio interest under the rules of section 871(h)(4). Subparagraph (A) of section 954(b)(3) (relating to exception where foreign base company income is less than 5 percent or $1,000,000). Paragraph (4) of section 954(b) (relating to exception for certain income subject to high foreign taxes). Clause (i) of section 954(c)(3)(A) (relating to certain income received from related persons). For purposes of this subsection, the term “controlled foreign corporation” has the meaning given to such term by section 957(a). Under rules similar to the rules of section 871(h)(6), the Secretary may provide that this subsection shall not apply to payments of interest described in section 871(h)(6). For purposes of this subsection, the term “registered form” has the meaning given such term by section 163(f). No tax shall be imposed under paragraph (1) or (3) of subsection (a) on any amount described in section 871(i)(2). Except as provided in subparagraph (B), no tax shall be imposed under paragraph (1) of subsection (a) on any interest-related dividend (as defined in section 871(k)(1)) received from a regulated investment company. to any dividend referred to in section 871(k)(1)(B), and to any interest-related dividend received by a controlled foreign corporation (within the meaning of section 957(a)) to the extent such dividend is attributable to interest received by the regulated investment company from a person who is a related person (within the meaning of section 864(d)(4)) with respect to such controlled foreign corporation. The rules of subsection (c)(5)(A) shall apply to any interest-related dividend received by a controlled foreign corporation (within the meaning of section 957(a)) to the extent such dividend is attributable to interest received by the regulated investment company which is described in clause (ii) of section 871(k)(1)(E) (and not described in clause (i) or (iii) of such section). No tax shall be imposed under paragraph (1) of subsection (a) on any short-term capital gain dividend (as defined in section 871(k)(2)) received from a regulated investment company. For doubling of tax on corporations of certain foreign countries, see section 891. For special rules for original issue discount, see section 871(g).