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 in effect before its repeal by this section), or (B) any amendment made by this Act. B Deduction for qualified business income of pass-thru entities 111. Deduction for qualified business income (a) In general Section 199A is amended by striking subsection (i). (b) Effective date The amendments made by this section shall apply to taxable years beginning after December 31, 2017. 112. Limitation on losses for taxpayers other than corporations (a) In general Section 461 is amended— (1) by amending subsection (l)(1) to read as follows: (1) Limitation In the case of a taxpayer other than a corporation, any excess business loss of the taxpayer for the taxable year shall not be allowed. , and (2) by striking subsection (j) and redesignating subsections (k) and (l) (as amended) as subsections (j) and (k), respectively. (b) Conforming amendments (1) Section 58(a)(2)(A) is amended by striking 461(k) and inserting 461(j) . (2) Section 461(i)(4) is amended by striking subsection (k) and inserting subsection (j) . (3) Section 464(d)(2)(B)(iii) is amended by striking section 461(k)(2)(E) and inserting section 461(j)(2)(E) . (4) Subparagraphs (B) and (C) of section 1256(e)(3) are each amended by striking section 461(k)(4) and inserting section 461(j)(4) . (c) Effective date The amendments made by this section shall apply to taxable years beginning after December 31, 2017. C Tax benefits for families and individuals 121. Increase in standard deduction (a) In general Section 63(c)(2) is amended— (1) by striking $4,400 in subparagraph (B) and inserting $18,000 , and (2) by striking $3,000 in subparagraph (C) and inserting $12,000 . (b) Inflation adjustment Section 63(c)(4) is amended to read as follows: (4) Adjustments for inflation (A) In general In the case of a taxable year