by striking paragraph (6). (5) Section 954 is amended by striking subsection (g). (c) Effective date The amendments made by this section shall apply to taxable years of foreign corporations beginning after December 31, 2017, and to taxable years of United States shareholders in which or with which such taxable years of foreign corporations end. 4203. Inflation adjustment of de minimis exception for foreign base company income (a) In general Section 954(b)(3) is amended by adding at the end the following new subparagraph: (D) Inflation adjustment In the case of any taxable year beginning after 2017, the dollar amount in subparagraph (A)(ii) shall be increased by an amount equal to— (i) such dollar amount, multiplied by (ii) the cost-of-living adjustment determined under section 1(c)(2)(A) for the calendar year in which the taxable year begins. Any increase determined under the preceding sentence shall be rounded to the nearest multiple of $50,000. . (b) Effective date The amendments made by this section shall apply to taxable years of foreign corporations beginning after December 31, 2017, and to taxable years of United States shareholders in which or with which such taxable years of foreign corporations end. 4204. Look-thru rule for related controlled foreign corporations made permanent (a) In general Paragraph (6) of section 954(c) is amended by striking subparagraph (C). (b) Effective date The amendments made by this section shall apply to taxable years of foreign corporations beginning after December 31, 2019, and to taxable years of United States shareholders in which or with which such taxable years of foreign corporations end. 4205. Modification of stock attribution rules for determining status as a controlled foreign corporation (a) In general Section 958(b) is amended— (1) by striking paragraph (4), and (2) by striking Paragraphs (1) and (4) in the last sentence and inserting Paragraph (1) . (b) Application of certain reporting requirements Section 6038(e)(2) is amended by striking except that— and all