Source: http://uscode.house.gov/view.xhtml?req=granuleid:USC-prelim-title26-section68&num=0&edition=prelim
Timestamp: 2019-04-23 02:43:18+00:00

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(2) 80 percent of the amount of the itemized deductions otherwise allowable for such taxable year.
(D) ½ the amount applicable under subparagraph (A) (after adjustment, if any, under paragraph (2)) in the case of a married individual filing a separate return.
For purposes of this paragraph, marital status shall be determined under section 7703.
(B) the cost-of-living adjustment determined under section 1(f)(3) for the calendar year in which the taxable year begins, except that section 1(f)(3)(A)(ii) shall be applied by substituting "2012" for "2016".
If any amount after adjustment under the preceding sentence is not a multiple of $50, such amount shall be rounded to the next lowest multiple of $50.
(3) the deduction under section 165(a) for casualty or theft losses described in paragraph (2) or (3) of section 165(c) or for losses described in section 165(d).
This section shall be applied after the application of any other limitation on the allowance of any itemized deduction.
This section shall not apply to any estate or trust.
This section shall not apply to any taxable year beginning after December 31, 2017, and before January 1, 2026.
2018-Subsec. (b)(2). Pub. L. 115–141 substituted "shall be" for "shall be shall be" in introductory provisions.
2017-Subsec. (b)(2)(B). Pub. L. 115–97, §11002(d)(2), substituted "1(f)(3)(A)(ii)" for "1(f)(3)(B)" and "2016" for "1992".
Subsec. (f). Pub. L. 115–97, §11046(a), added subsec. (f).
"(1) In general.-For purposes of this section, the term 'applicable amount' means $100,000 ($50,000 in the case of a separate return by a married individual within the meaning of section 7703).
"(B) the cost-of-living adjustment determined under section 1(f)(3) for the calendar year in which the taxable year begins, by substituting 'calendar year 1990' for 'calendar year 1992' in subparagraph (B) thereof."
Subsecs. (f), (g). Pub. L. 112–240, §101(b)(2)(A)(ii), struck out subsecs. (f) and (g), which related to phaseout of limitation and termination of applicability of section, respectively.
2001-Subsecs. (f), (g). Pub. L. 107-16 added subsecs. (f) and (g).
1998-Subsec. (c)(3). Pub. L. 105–277 substituted "for casualty or theft losses described in paragraph (2) or (3) of section 165(c) or for losses described in section 165(d)" for "for losses described in subsection (c)(3) or (d) of section 165".
1993-Subsec. (b)(2)(B). Pub. L. 103–66, §13201(b)(3)(E), substituted "1992" for "1989".
Subsec. (f). Pub. L. 103–66, §13204, struck out heading and text of subsec. (f). Text read as follows: "This section shall not apply to any taxable year beginning after December 31, 1995."
Amendment by section 11002(d)(2) of Pub. L. 115–97 applicable to taxable years beginning after Dec. 31, 2017, see section 11002(e) of Pub. L. 115–97, set out as a note under section 1 of this title.
Pub. L. 115–97, title I, §11046(b), Dec. 22, 2017, 131 Stat. 2088 , provided that: "The amendments made by this section [amending this section] shall apply to taxable years beginning after December 31, 2017."
Amendment by Pub. L. 112–240 applicable to taxable years beginning after Dec. 31, 2012, see section 101(b)(3) of Pub. L. 112–240, set out as a note under section 1 of this title.
Pub. L. 107–16, title I, §103(b), June 7, 2001, 115 Stat. 45 , provided that: "The amendment made by this section [amending this section] shall apply to taxable years beginning after December 31, 2005."
Pub. L. 105–277, div. J, title IV, §4004(c)(3), Oct. 21, 1998, 112 Stat. 2681–911 , provided that: "The amendment made by subsection (b)(2) [amending this section] shall apply to taxable years beginning after December 31, 1990."
Amendment by section 13201(b)(3)(E) of Pub. L. 103–66 applicable to taxable years beginning after Dec. 31, 1992, see section 13201(c) of Pub. L. 103–66, set out as a note under section 1 of this title.
Section applicable to taxable years beginning after Dec. 31, 1990, see section 11103(e) of Pub. L. 101–508, set out as an Effective Date of 1990 Amendment note under section 1 of this title.

References: §11002
 §11046
 §101
 §13201
 §13204
 §11046
 §103
 §4004