and (D) in the case of an estate or trust, $12,700. (13) Determination of 0 percent rate bracket for estates and trusts In the case of any estate or trust, paragraph (1)(B) shall be applied by treating the amount determined in clause (i) thereof as being equal to $2,600. (14) Inflation adjustment (A) In general In the case of any taxable year beginning after 2018, each of the dollar amounts in paragraphs (12) and (13) shall be increased by an amount equal to— (i) such dollar amount, multiplied by (ii) the cost-of-living adjustment determined under subsection (f)(3) for the calendar year in which the taxable year begins, determined by substituting calendar year 2017 for calendar year 2016 in subparagraph (A)(ii) thereof. (B) Rounding If any increase under subparagraph (A) is not a multiple of $50, such increase shall be rounded to the next lowest multiple of $50. . (i) Application of section 15 (1) In general Subsection (a) of section 15 is amended by striking If any rate of tax and inserting In the case of a corporation, if any rate of tax . (2) Conforming amendments (A) Section 15 is amended by striking subsections (d), (e), and (f). (B) Section 6013(c) is amended by striking sections 15, 443, and 7851(a)(1)(A) and inserting section 443 . (C) The heading of section 15 is amended by inserting on corporations after Effect of changes . (D) The table of sections for part III of subchapter A of chapter 1 is amended by striking the item relating to section 15 and inserting the following new item: Sec. 15. Effect of changes on corporations. . (j) Conforming amendments (1) Section 1 is amended by striking subsections (i) and (j). (2) Section 3402(q)(1) is amended by striking third lowest and inserting fourth lowest . (k) Effective date (1) In general The amendments made by this section shall apply to taxable years beginning after December 31, 2017. (2) Application of section 15 Section 15 of the Internal Revenue Code of 1986 shall not apply to any change in a rate of tax by reason of— (A) section 1(j) of such Code (as