26 U.S.C. § 163

The Clean Air Act, referred to in subsec. (h)(4)(D)(v), is act July 14, 1955, ch. 360, 69 Stat. 322, which is classified generally to chapter 85 (§ 7401 et seq.) of Title 42, The Public Health and Welfare. Title II of the Act, known as the National Emission Standards Act, is classified generally to subchapter II (§ 7521 et seq.) of chapter 85 of Title 42. For complete classification of this Act to the Code, see Short Title note set out under section 7401 of Title 42 and Tables.

The date of the enactment of this subparagraph, referred to in subsec. (h)(5)(E)(ii), is the date of enactment of Pub. L. 109–432, which was approved Dec. 20, 2006.

Section 199A(g)(2), referred to in subsec. (j)(7)(C)(ii), probably should be a reference to section 199A(g)(4), which defines “specified agricultural or horticultural cooperative” after the general amendment of section 199A(g) by Pub. L. 115–141, div. T, § 101(a)(1), Mar. 23, 2018, 132 Stat. 1151.

Section 6664(d)(2)(A), referred to in subsec. (m), was redesignated as section 6664(d)(3)(A) by Pub. L. 111–152, title I, § 1409(c)(2)(A), Mar. 30, 2010, 124 Stat. 1069.

2025—Subsec. (h)(3)(F). Pub. L. 119–21, § 70108(a)(3), substituted “beginning after 2017” for “2018 through 2025” in heading.

Subsec. (h)(3)(F)(i). Pub. L. 119–21, § 70108(a)(1)(A), struck out “, and before January 1, 2026” after “December 31, 2017” in introductory provisions.

Subsec. (h)(3)(F)(i)(III) to (V). Pub. L. 119–21, § 70108(a)(1)(B)–(D), added subcl. (III), redesignated former subcls. (III) and (IV) as (IV) and (V), respectively, and substituted “subclause (IV)” for “subclause (III)” in subcl. (V).

Subsec. (h)(3)(F)(ii) to (iv). Pub. L. 119–21, § 70108(a)(2), redesignated cls. (iii) and (iv) as (ii) and (iii), respectively, and struck out former cl. (ii). Prior to amendment, text of cl. (ii) read as follows: “In the case of taxable years beginning after December 31, 2025, the limitation under subparagraph (B)(ii) shall be applied to the aggregate amount of indebtedness of the taxpayer described in subparagraph (B)(i) without regard to the taxable year in which the indebtedness was incurred.”

Subsec. (h)(4), (5). Pub. L. 119–21, § 70203(a), added par. (4) and redesignated former par. (4) as (5).

Subsec. (j)(5). Pub. L. 119–21, § 70341(b), inserted at end “Such term shall not include any interest which is capitalized under section 263(g) or 263A(f).”

Subsec. (j)(8)(A)(v). Pub. L. 119–21, § 70303(a), struck out “in the case of taxable years beginning before January 1, 2022,” before “any deduction”.

Subsec. (j)(8)(A)(vi). Pub. L. 119–21, § 70342(a), added cl. (vi).

Subsec. (j)(9)(C). Pub. L. 119–21, § 70303(b), inserted concluding provisions.

Subsec. (j)(10) to (13). Pub. L. 119–21, § 70341(a), (c), added pars. (10) and (11) and successively redesignated former pars. (10) and (11) as (12) and (13), respectively.

2020—Subsec. (h)(3)(E)(iv)(I). Pub. L. 116–260 substituted “December 31, 2021” for “December 31, 2020”.

Subsec. (j)(10), (11). Pub. L. 116–136 added par. (10) and redesignated former par. (10) as (11).

2019—Subsec. (h)(3)(E)(iv)(I). Pub. L. 116–94 substituted “December 31, 2020” for “December 31, 2017”.

2018—Subsec. (d)(4)(E). Pub. L. 115–141, § 401(b)(12), struck out subpar. (E). Text read as follows: “Investment income of the taxpayer for any taxable year shall be reduced by the amount of the passive activity loss to which section 469(a) does not apply for such taxable year by reason of section 469(m). The preceding sentence shall not apply to any portion of such passive activity loss which is attributable to a rental real estate activity with respect to which the taxpayer actively participates (within the meaning of section 469(i)(6)) during such taxable year.”

Subsec. (e)(1). Pub. L. 115–141, § 401(c)(1)(C), substituted “The portion of the original issue discount with respect to any debt instrument which is” for “In the case of any debt instrument issued after July 1, 1982, the portion of the original issue discount with respect to such debt instrument which is”.

Subsec. (e)(4). Pub. L. 115–141, § 401(c)(3)(B), amended par. (4) generally. Prior to amendment, text read as follows: “This subsection shall not apply to any debt instrument described in—

“(A) subparagraph (D) of section 1272(a)(2) (relating to obligations issued by natural persons before March 2, 1984), and

“(B) subparagraph (E) of section 1272(a)(2) (relating to loans between natural persons).”

Subsec. (e)(5)(C)(ii). Pub. L. 115–141, § 401(a)(48), inserted “in” before “subsection (i)(1)(B)”.

Subsec. (h)(3)(E)(iv)(I). Pub. L. 115–123 substituted “December 31, 2017” for “December 31, 2016”.

2017—Subsec. (h)(3)(F). Pub. L. 115–97, § 11043(a), added subpar. (F).

Subsec. (j). Pub. L. 115–97, § 13301(a), amended subsec. (j) generally. Prior to amendment, subsec. (j) related to a limitation on deduction for interest on certain indebtedness of a corporation.

2015—Subsec. (h)(3)(E)(iv)(I). Pub. L. 114–113 substituted “December 31, 2016” for “December 31, 2014”.

2014—Subsec. (d)(6). Pub. L. 113–295, § 221(a)(25)(A)(i), struck out par. (6) which related to phase-in of disallowance.

Subsec. (h)(3)(E)(iv)(I). Pub. L. 113–295, § 104(a), substituted “December 31, 2014” for “December 31, 2013”.

Subsec. (h)(4)(F). Pub. L. 113–295, § 220(h), substituted “Department of Veterans Affairs or the Rural Housing Service” for “Veterans Administration or the Rural Housing Administration”.

Subsec. (h)(5). Pub. L. 113–295, § 221(a)(25)(A)(ii), struck out par. (5). Text read as follows: “In the case of any taxable year beginning in calendar years 1987 through 1990, the amount of interest with respect to which a deduction is disallowed under this subsection shall be equal to the applicable percentage (within the meaning of subsection (d)(6)(B)) of the amount which (but for this paragraph) would have been so disallowed.”

2013—Subsec. (h)(3)(E)(iv)(I). Pub. L. 112–240, § 204(a), substituted “December 31, 2013” for “December 31, 2011”.

Subsec. (h)(4)(E)(i). Pub. L. 112–240, § 204(b), substituted “Department of Veterans Affairs” for “Veterans Administration” and “Rural Housing Service” for “Rural Housing Administration”.

2010—Subsec. (f)(2)(A)(ii) to (iv). Pub. L. 111–147, § 502(a)(2)(B), inserted “or” at end of cl. (ii), substituted period for “, or” in cl. (iii), and struck out cl. (iv), which read as follows: “is described in subparagraph (B).”

Subsec. (f)(2)(B). Pub. L. 111–147, § 502(a)(1), (2)(C)(i), redesignated subpar. (C) as (B), struck out “, and subparagraph (B),” after “subparagraph (A)” in introductory provisions, and struck out former subpar. (B) which related to certain obligations not included as registration-required obligations.

Subsec. (f)(2)(B)(i). Pub. L. 111–147, § 502(a)(2)(C)(ii), amended cl. (i) generally. Prior to amendment, cl. (i) read as follows: “in the case of—

“(I) subparagraph (A), such obligation is of a type which the Secretary has determined by regulations to be used frequently in avoiding Federal taxes, or

“(II) subparagraph (B), such obligation is of a type specified by the Secretary in regulations, and”.

Subsec. (f)(2)(C). Pub. L. 111–147, § 502(a)(1), redesignated subpar. (C) as (B).

Subsec. (f)(3). Pub. L. 111–147, § 502(c), inserted before period at end “, except that a dematerialized book entry system or other book entry system specified by the Secretary shall be treated as a book entry system described in such section”.

Subsec. (h)(3)(E)(iv)(I). Pub. L. 111–312 substituted “December 31, 2011” for “December 31, 2010”.

2009—Subsec. (e)(5)(F), (G). Pub. L. 111–5, § 1232(a), added subpar. (F) and redesignated former subpar. (F) as (G).

Subsec. (i)(1). Pub. L. 111–5, § 1232(b), in concluding provisions, inserted “(i)” before “permit a rate” and “, or (ii) permit, on a temporary basis, a rate to be used with respect to any debt instrument which is higher than the applicable Federal rate if the Secretary determines that such rate is appropriate in light of distressed conditions in the debt capital markets” before period at end.

2007—Subsec. (h)(3)(E)(iv)(I). Pub. L. 110–142 substituted “December 31, 2010” for “December 31, 2007”.

2006—Subsec. (h)(3)(E). Pub. L. 109–432, § 419(a), added subpar. (E).

Subsec. (h)(4)(E), (F). Pub. L. 109–432, § 419(b), added subpars. (E) and (F).

Subsec. (j)(8). Pub. L. 109–222, § 501(a), added par. (8). Former par. (8) redesignated (9).

Subsec. (j)(9). Pub. L. 109–222 redesignated par. (8) as (9) and added subpar. (D).

2005—Subsec. (j)(6)(A)(i)(III), (IV). Pub. L. 109–135 added subcl. (III) and redesignated former subcl. (III) as (IV).

2004—Subsec. (e)(3)(B), (C). Pub. L. 108–357, § 841(a), added subpar. (B) and redesignated former subpar. (B) as (C).

Subsec. (l)(2). Pub. L. 108–357, § 845(a), inserted “or equity held by the issuer (or any related party) in any other person” after “or a related party”.

Subsec. (l)(3). Pub. L. 108–357, § 845(d), substituted “or any other person” for “or a related party” in introductory provisions.

Subsec. (l)(4) to (7). Pub. L. 108–357, § 845(b), (c), added pars. (4) and (5) and redesignated former pars. (4) and (5) as (6) and (7), respectively.

Subsecs. (m), (n). Pub. L. 108–357, § 838(a), added subsec. (m) and redesignated former subsec. (m) as (n).

2003—Subsec. (d)(4)(B). Pub. L. 108–27 inserted at end “Such term shall include qualified dividend income (as defined in section 1(h)(11)(B)) only to the extent the taxpayer elects to treat such income as investment income for purposes of this subsection.”

1999—Subsec. (j)(3)(C). Pub. L. 106–170 added subpar. (C).

1998—Subsec. (h)(2)(F). Pub. L. 105–277 added subpar. (F).

1997—Subsec. (h)(2)(E). Pub. L. 105–34, § 503(b)(2)(B), struck out “or 6166 or under section 6166A (as in effect before its repeal by the Economic Recovery Tax Act of 1981)” after “section 6163”.

Subsec. (h)(4)(A)(i)(I). Pub. L. 105–34, § 312(d)(1), substituted “section 121” for “section 1034”.

Subsec. (j)(2)(B)(iii). Pub. L. 105–34, § 1604(g)(1), substituted “clause (ii)” for “clause (i)” in introductory provisions.

Subsec. (k). Pub. L. 105–34, § 503(b)(2)(A), added subsec. (k). Former subsec. (k) redesignated (l).

Subsec. (l). Pub. L. 105–34, § 1005(a), added subsec. (l). Former subsec. (l) redesignated (m).

Pub. L. 105–34, § 503(b)(2)(A), redesignated subsec. (k) as (l).

Subsec. (m). Pub. L. 105–34, § 1005(a), redesignated subsec. (l) as (m).

1996—Subsec. (j)(1)(B). Pub. L. 104–188, § 1704(f)(2)(A), inserted before period at end “(and clause (ii) of paragraph (2)(A) shall not apply for purposes of applying this subsection to the amount so treated)”.

Subsec. (j)(6)(E)(ii). Pub. L. 104–188, § 1703(n)(4), which directed that cl. (ii) be amended by substituting “which is” for “which is a”, could not be executed, because “which is a” does not appear.

Subsec. (j)(7), (8). Pub. L. 104–188, § 1704(f)(2)(B), added par. (7) and redesignated former par. (7) as (8).

1993—Subsec. (d)(4)(B). Pub. L. 103–66, § 13206(d)(1), amended heading and text of subpar. (B) generally. Prior to amendment, text read as follows: “The term ‘investment income’ means the sum of—

“(i) gross income (other than gain taken into account under clause (ii)) from property held for investment, and

“(ii) any net gain attributable to the disposition of property held for investment.”

Subsec. (j). Pub. L. 103–66, § 13228(c)(2), substituted “for interest on certain indebtedness” for “for certain interest paid by corporation to related person” in heading.

Subsec. (j)(3). Pub. L. 103–66, § 13228(a), amended heading and text of par. (3) generally. Prior to amendment, text read as follows: “For purposes of this subsection—

“(A) In general.—Except as provided in subparagraph (B), the term ‘disqualified interest’ means any interest paid or accrued by the taxpayer (directly or indirectly) to a related person if no tax is imposed by this subtitle with respect to such interest.

“(B) Exception for certain existing indebtedness.—The term ‘disqualified interest’ does not include any interest paid or accrued under indebtedness with a fixed term—

“(i) which was issued on or before July 10, 1989, or

“(ii) which was issued after such date pursuant to a written binding contract in effect on such date and all times thereafter before such indebtedness was issued.”

Subsec. (j)(5)(B). Pub. L. 103–66, § 13228(c)(1), struck out “to a related person” after “by the taxpayer” in introductory provisions.

Subsec. (j)(6)(D), (E). Pub. L. 103–66, § 13228(b), added subpars. (D) and (E).

1990—Subsec. (e)(5)(A). Pub. L. 101–508, § 11701(b)(1), amended last sentence generally. Prior to amendment, last sentence read as follows: “For purposes of clause (ii), rules similar to the rules of subsection (i)(3)(B) shall apply in determining the time when the original issue discount is paid.”

Subsec. (i)(3). Pub. L. 101–508, § 11701(b)(2)(B), inserted sentence at end.

Subsec. (i)(3)(B). Pub. L. 101–508, § 11701(b)(2)(A), struck out “(or stock)” after “obligation” wherever appearing.

Subsec. (j)(2)(A)(ii). Pub. L. 101–508, § 11701(c)(2), substituted “or on any other day” for “and on such other days”.

Subsec. (j)(2)(C). Pub. L. 101–508, § 11701(c)(1), substituted “reduced (but not below zero) by such” for “less such” in introductory provisions.

1989—Subsec. (e)(5), (6). Pub. L. 101–239, § 7202(a), added par. (5) and redesignated former par. (5) as (6).

Subsec. (i). Pub. L. 101–239, § 7202(b), added subsec. (i). Former subsec. (i) redesignated (j).

Subsec. (j). Pub. L. 101–239, § 7210(a), added subsec. (j). Former subsec. (j) redesignated (k).

Pub. L. 101–239, § 7202(b), redesignated subsec. (i) as (j).

Subsec. (k). Pub. L. 101–239, § 7210(a), redesignated subsec. (j) as (k).

1988—Subsec. (d)(3)(A). Pub. L. 100–647, § 1005(c)(1), substituted “properly allocable to” for “incurred or continued to purchase or carry”.

Subsec. (d)(4)(B). Pub. L. 100–647, § 1005(c)(2), amended subpar. (B) generally. Prior to amendment, subpar. (B) read as follows: “The term ‘investment income’ means the sum of—

“(i) gross income (other than gain described in clause (ii)) from property held for investment, and

“(ii) any net gain attributable to the disposition of property held for investment,

but only to the extent such amounts are not derived from the conduct of a trade or business.”

Subsec. (d)(6)(A). Pub. L. 100–647, § 1005(c)(3), amended subpar. (A) generally. Prior to amendment, subpar. (A) read as follows: “The amount of interest disallowed under this subsection for any such taxable year shall be equal to the sum of—

“(i) the applicable percentage of the amount which (without regard to this paragraph) is not allowed as a deduction under this subsection for the taxable year to the extent such amount does not exceed the ceiling amount,

“(ii) the amount which (without regard to this paragraph) is not allowed as a deduction under this subsection in excess of the ceiling amount, plus

“(iii) the amount of any carryforward to such taxable year under paragraph (2) with respect to which a deduction was disallowed under this subsection for a preceding taxable year.

For purposes of this subparagraph, the amount under clause (i) or (ii) shall be computed without regard to the amount described in clause (iii).”

Subsec. (e)(2)(B). Pub. L. 100–647, § 1006(u)(1), substituted “paragraph (7)” for “paragraph (6)”.

Subsec. (h)(2)(A). Pub. L. 100–647, § 1005(c)(4), substituted “properly allocable to” for “incurred or continued in connection with the conduct of”.

Subsec. (h)(2)(E). Pub. L. 100–647, § 1005(c)(12), inserted “or under section 6166A (as in effect before its repeal by the Economic Recovery Tax Act of 1981)” before period at end.

Subsec. (h)(3)(C). Pub. L. 100–647, § 1005(c)(5), effective as if enacted immediately before enactment of Pub. L. 100–203 (see 1987 Amendment note below), amended subpar. (C) generally. Prior to amendment, subpar. (C) read as follows: “The amount under subparagraph (B)(ii)(I) at any time after August 16, 1986, shall not be less than the outstanding aggregate principal amount (as of such time) of indebtedness which was incurred on or before August 16, 1986, and which was secured by the qualified residence on August 16, 1986.”

Subsec. (h)(4). Pub. L. 100–647, § 1005(c)(6)(A), effective as if enacted immediately before enactment of Pub. L. 100–203 (redesignating par. (5) as (4), see 1987 Amendment note below), amended heading by substituting “Other definitions and special rules—For purposes of this subsection—” for “Other definitions and special rules”.

Subsec. (h)(4)(A). Pub. L. 100–647, § 1005(c)(6)(B)(i), (7), effective as if enacted immediately before enactment of Pub. L. 100–203 (redesignating par. (5) as (4), see 1987 Amendment note below), amended subpar. (A) by striking out “For purposes of this subsection—” after “Qualified residence” in introductory provisions, “used or” after “Residence not” in cl. (iii) heading, and “or use” after “does not rent” in cl. (iii) text.

Subsec. (h)(4)(B). Pub. L. 100–647, § 1005(c)(6)(B)(ii), effective as if enacted immediately before enactment of Pub. L. 100–203 (redesignating par. (5) as (4), see 1987 Amendment note below), amended subpar. (B) by substituting “Any” for “For purposes of this paragraph, any”.

Subsec. (h)(4)(C), (D). Pub. L. 100–647, § 1005(c)(8), effective as if enacted immediately before enactment of Pub. L. 100–203 (redesignating par. (5) as (4), see 1987 Amendment note below), par. (4) added subpars. (C) and (D).

Subsec. (h)(5). Pub. L. 100–647, § 2004(b)(1), redesignated par. (6) as (5).

Subsec. (h)(6). Pub. L. 100–647, § 2004(b)(1), redesignated par. (6) as (5).

Pub. L. 100–647, § 1005(c)(9), substituted “but for this paragraph” for “but for this subsection”.

Subsec. (i)(2). Pub. L. 100–647, § 1009(b)(6), made technical correction to directory language of Pub. L. 99–514, § 902(e)(1), see 1986 Amendment note below.

1987—Subsec. (d)(4)(E). Pub. L. 100–203, § 10212(b), substituted “section 469(m)” for “section 469(l)”.

Subsec. (h)(3). Pub. L. 100–203, § 10102(a), amended par. (3) generally. Prior to amendment (see 1988 Amendment note above), par. (3) read as follows: “For purposes of this subsection—

“(A) In general.—The term ‘qualified residence interest’ means interest which is paid or accrued during the taxable year on indebtedness which is secured by any property which (at the time such interest is paid or accrued) is a qualified residence of the taxpayer.

“(B) Limitation on amount of interest.—The term ‘qualified residence interest’ shall not include any interest paid or accrued on indebtedness secured by any qualified residence which is allocable to that portion of the principal amount of such indebtedness which, when added to the outstanding aggregate principal amount of all other indebtedness previously incurred and secured by such qualified residence, exceeds the lesser of—

“(i) the fair market value of such qualified residence, or

“(ii) the sum of—

“(I) the taxpayer’s basis in such qualified residence (adjusted only by the cost of any improvements to such residence), plus

“(II) the aggregate amount of qualified indebtedness of the taxpayer with respect to such qualified residence.

“(C) Cost not less than balance of indebtedness incurred on or before august 16, 1986.—

“(i) In general.—The amount under subparagraph (B)(ii)(I) at any time after August 16, 1986, shall not be less than the outstanding principal amount (as of such time) of indebtedness—

“(I) which was incurred on or before August 16, 1986, and which was secured by the qualified residence on August 16, 1986, or

“(II) which is secured by the qualified residence and was incurred after August 16, 1986, to refinance indebtedness described in subclause (I) (or refinanced indebtedness meeting the requirements of this subclause) to the extent (immediately after the refinancing) the principal amount of the indebtedness resulting from the refinancing does not exceed the principal amount of the refinanced indebtedness (immediately before the refinancing).

“(ii) Limitation on period of refinancing.—Subclause (II) of clause (i) shall not apply to any indebtedness after—

“(I) the expiration of the term of the indebtedness described in clause (i)(I), or

“(II) if the principal of the indebtedness described in clause (i)(I) is not amortized over its term, the expiration of the term of the 1st refinancing of such indebtedness (or if earlier, the date which is 30 years after the date of such refinancing).

“(D) Time for determination.—Except as provided in regulations, any determination under subparagraph (B) shall be made as of the time the indebtedness is incurred.”

Subsec. (h)(4), (5). Pub. L. 100–203, § 10102(b), redesignated par. (5) as (4) and struck out former par. (4) which defined “qualified indebtedness” for purposes of this subsection.

1986—Subsec. (d). Pub. L. 99–514, § 511(a), substituted “Limitation on investment interest” for “Limitation on interest on investment indebtedness” in heading, and amended text generally, revising and restating as pars. (1) to (6) provisions of former pars. (1) to (7).

Subsec. (e)(2)(C). Pub. L. 99–514, § 1803(a)(4), added subpar. (C).

Subsec. (e)(3)(A). Pub. L. 99–514, § 1810(e)(1)(A), inserted “The preceding sentence shall not apply to the extent that the original issue discount is effectively connected with the conduct by such foreign related person of a trade or business within the United States unless such original issue discount is exempt from taxation (or is subject to a reduced rate of tax) pursuant to a treaty obligation of the United States.”

Subsec. (e)(5). Pub. L. 99–514, § 1810(e)(1)(B), redesignated par. (4), relating to cross references, as (5).

Subsec. (f)(3). Pub. L. 99–514, § 1301(j)(3), substituted “section 149(a)(3)” for “section 103(j)(3)”.

Subsec. (h). Pub. L. 99–514, § 511(b), added subsec. (h). Former subsec. (h) redesignated (i).

Subsec. (i)(2). Pub. L. 99–514, § 902(e)(1), as amended by Pub. L. 100–647, § 1009(b)(6), substituted “section 265(a)(2)” for “section 265(2)”.

Pub. L. 99–514, § 511(b), redesignated former subsec. (h) as (i).

1984—Subsec. (d)(3)(D). Pub. L. 98–369, § 56(b), designated existing provisions as cl. (i) and added cl. (ii).

Subsec. (e)(1). Pub. L. 98–369, § 42(a)(3), substituted “debt instrument” for “bond” in two places and struck out “by an issuer (other than a natural person)” before “, the portion of the original issue”.

Subsec. (e)(2). Pub. L. 98–369, § 42(a)(3), substituted provisions relating to debt instruments for provisions relating to bonds.

Subsec. (e)(3). Pub. L. 98–369, § 128(c), added par. (3) relating to special rule for original issue discount on obligation held by related foreign person. Former par. (3), relating to exceptions, redesignated (4).

Pub. L. 98–369, § 42(a)(3), added par. (3) relating to exceptions.

Subsec. (e)(4). Pub. L. 98–369, § 128(c), redesignated par. (3), relating to exceptions, as (4).

Pub. L. 98–369, § 42(a)(3), added par. (4) relating to cross references.

Subsec. (f)(2)(C)(i). Pub. L. 98–369, § 127(f), redesignated existing provision as subcl. (I), and in subcl. (I) as so redesignated, inserted reference to subpar. (A) and substituted “or” for “and”, and added subcl. (II).

Subsecs. (g), (h). Pub. L. 98–369, § 612(c), added subsec. (g) and redesignated former subsec. (g) as (h).

1982—Subsec. (d)(4). Pub. L. 97–354 redesignated subpar. (D) as (B). Former subpars. (B) and (C), relating to partnerships and shareholders of electing small business corporations, respectively, were struck out.

Subsec. (e). Pub. L. 97–248, § 231(b), added subsec. (e) relating to original issue discount. Former subsec. (e), setting forth cross references, redesignated (f).

Pub. L. 97–248, § 231(b), redesignated former subsec. (e), setting forth cross references, as (f).

Subsec. (f). Pub. L. 97–248, § 310(b)(2), added subsec. (f) relating to the requirement that obligations be in registered form to be tax-exempt. Former subsec. (f), setting forth cross references, redesignated (g).

Subsec. (g). Pub. L. 97–248, § 310(b)(2), redesignated former subsec. (f), setting forth cross references, as (g).

1976—Subsec. (b)(1). Pub. L. 94–455, § 1901(b)(8)(C), substituted “organization described in section 170(b)(1)(A)(ii) and which is provided for a student of such organization” for “institution (as defined in section 151(e)(4)) and which is provided for a student of such institution”.

Subsec. (d)(1). Pub. L. 94–455, § 209(a)(1), among other changes, substituted in subpar. (A) “$10,000” for “$25,000” and “$5,000” for “$12,500”, struck out subpar. (C) relating to the excess of net long-term capital gain over short-term capital loss and subpar. (D) relating to the excess of investment interest over amounts in subpar. (A), and in provisions following lettered paragraphs substituted “$10,000” for “$25,000” and struck out provisions relating to the determination of the amount referred to in subpar. (C).

Subsec. (d)(2). Pub. L. 94–455, § 209(a)(1), among other changes, struck out provisions relating to the limitation on the amount of interest allowable by this par. and to reduction of disallowed investment interest for capital gain deduction purposes.

Subsec. (d)(3)(A). Pub. L. 94–455, § 209(a)(2), inserted provision relating to determination of the amount of net investment income where taxpayer has investment interest for taxable year to which this subsection applies.

Subsec. (d)(3)(B)(iii). Pub. L. 94–455, §§ 205(c)(3), 1901(b)(3)(K), substituted “1250, and 1254” for “and 1250”, and “ordinary income” for “gain from the sale or exchange of property which is neither a capital asset nor property described in section 1231”. Section 205(c)(3) of Pub. L. 94–455, which directed the amendment of subsec. (d)(3)(A)(iii), was executed by amending subsec. (d)(3)(B)(iii) to reflect the probable intent of Congress.

Subsec. (d)(3)(E). Pub. L. 94–455, § 209(a)(3), substituted “limitation in paragraph (1)” for “limitations in paragraphs (1) and (2)(A)”.

Subsec. (d)(4)(B), (C). Pub. L. 94–455, § 1906(b)(13)(A), struck out “or his delegate” after “Secretary”.

Subsec. (d)(5). Pub. L. 94–455, § 209(a)(4), (5), redesignated par. (6) as (5) and inserted provision relating to the application of this paragraph after Dec. 31, 1975, on an allocation basis rather than a specific item basis. Former par. (5), relating to capital gains treatment of investment interest, was struck out.

Pub. L. 94–455, § 1901(b)(3)(K), directed the amendment of par. (5) by substituting “ordinary income” for “gain from the sale or exchange of property which is neither a capital asset nor property described in section 1231”, such par. (5) having been struck out by Pub. L. 94–455, § 209(a)(4).

Subsec. (d)(6). Pub. L. 94–455, §§ 209(a)(4), 1906(b)(13)(A), redesignated par. (7) as (6) and struck out in provision following subpar. (B) “or his delegate” after “Secretary”. Former par. (6) redesignated (5).

Subsec. (d)(7). Pub. L. 94–455, § 209(a)(6), added par. (7). Former par. (7) redesignated (6).

1971—Subsec. (d)(1)(B). Pub. L. 92–178, § 304(b)(2), inserted “the amount (if any) by which the deductions allowable under this section (determined without regard to this subsection) and sections 162, 164(a)(1) or (2), or 212 attributable to property of the taxpayer subject to a net lease exceeds the rental income produced by such property for the property year, plus” after “plus”.

Subsec. (d)(3)(C). Pub. L. 92–178, § 304(d), inserted reference to section 162.

Subsec. (d)(4)(A)(i). Pub. L. 92–178, § 304(a)(2)(A), inserted “of the lessor” after “deductions” and “(other than rents and reimbursed amounts with respect to such property)” after “section 162”.

Subsec. (d)(7). Pub. L. 92–178, § 304(a)(2)(B), added par. (7).

1969—Subsecs. (d), (e). Pub. L. 91–172 added subsec. (d). Former subsec. (d) redesignated (e).

1964—Subsec. (b)(1). Pub. L. 88–272 included the purchase of educational services, and defined “educational services”.

1963—Subsecs. (c), (d). Pub. L. 88–9, § 1(a), (c), added subsec. (c), redesignated former subsec. (c) as (d) and added par. (5).

Pub. L. 119–21, title VII, § 70108(b), July 4, 2025, 139 Stat. 163, provided that: “The amendments made by this section [amending this section] shall apply to taxable years beginning after December 31, 2025.”

Amendment by section 70203(a) of Pub. L. 119–21 applicable to indebtedness incurred after Dec. 31, 2024, see section 70203(e) of Pub. L. 119–21, set out as a note under section 56 of this title.

Pub. L. 119–21, title VII, § 70303(c), July 4, 2025, 139 Stat. 195, provided that:“(1)In general.—The amendments made by this section [amending this section] shall apply to taxable years beginning after December 31, 2024.“(2)Special rule for short taxable years.—The Secretary of the Treasury (or the Secretary’s delegate) may prescribe such rules as are necessary or appropriate to provide for the application of the amendments made by this section in the case of any taxable year of less than 12 months that begins after December 31, 2024, and ends before the date of the enactment of this Act [July 4, 2025].”

Pub. L. 119–21, title VII, § 70341(d), July 4, 2025, 139 Stat. 208, provided that: “The amendments made by this section [amending this section] shall apply to taxable years beginning after December 31, 2025.”

Pub. L. 119–21, title VII, § 70342(b), July 4, 2025, 139 Stat. 208, provided that: “The amendments made by this section [amending this section] shall apply to taxable years beginning after December 31, 2025.”

Pub. L. 116–260, div. EE, title I, § 133(b), Dec. 27, 2020, 134 Stat. 3053, provided that: “The amendment made by this section [amending this section] shall apply to amounts paid or accrued after December 31, 2020.”

Pub. L. 116–136, div. A, title II, § 2306(b), Mar. 27, 2020, 134 Stat. 359, provided that: “The amendments made by this section [amending this section] shall apply to taxable years beginning after December 31, 2018.”

Pub. L. 116–94, div. Q, title I, § 102(b), Dec. 20, 2019, 133 Stat. 3228, provided that: “The amendment made by this section [amending this section] shall apply to amounts paid or accrued after December 31, 2017.”

Pub. L. 115–141, div. U, title IV, § 401(c)(1)(H), Mar. 23, 2018, 132 Stat. 1205, provided that: “The amendments made by this paragraph [amending this section and sections 1271, 1272, and 1278 of this title] shall apply to debt instruments issued on or after July 2, 1982.”

Pub. L. 115–141, div. U, title IV, § 401(c)(3)(C), Mar. 23, 2018, 132 Stat. 1206, provided that: “The amendments made by this paragraph [amending this section and section 1272 of this title] shall apply to obligations issued on or after March 2, 1984.”

Pub. L. 115–123, div. D, title I, § 40202(b), Feb. 9, 2018, 132 Stat. 145, provided that: “The amendment made by this section [amending this section] shall apply to amounts paid or accrued after December 31, 2016.”

Pub. L. 115–97, title I, § 11043(b), Dec. 22, 2017, 131 Stat. 2087, provided that: “The amendments made by this section [amending this section] shall apply to taxable years beginning after December 31, 2017.”

Pub. L. 115–97, title I, § 13301(c), Dec. 22, 2017, 131 Stat. 2121, provided that: “The amendments made by this section [amending this section and sections 381 and 382 of this title] shall apply to taxable years beginning after December 31, 2017.”

Pub. L. 114–113, div. Q, title I, § 152(b), Dec. 18, 2015, 129 Stat. 3066, provided that: “The amendment made by this section [amending this section] shall apply to amounts paid or accrued after December 31, 2014.”

Pub. L. 113–295, div. A, title I, § 104(b), Dec. 19, 2014, 128 Stat. 4013, provided that: “The amendment made by this section [amending this section] shall apply to amounts paid or accrued after December 31, 2013.”

Amendment by section 221(a)(25)(A) of Pub. L. 113–295 effective Dec. 19, 2014, subject to a savings provision, see section 221(b) of Pub. L. 113–295, set out as a note under section 1 of this title.

Pub. L. 112–240, title II, § 204(c), Jan. 2, 2013, 126 Stat. 2323, provided that: “The amendments made by this section [amending this section] shall apply to amounts paid or accrued after December 31, 2011.”

Pub. L. 111–312, title VII, § 759(b), Dec. 17, 2010, 124 Stat. 3323, provided that: “The amendment made by this section [amending this section] shall apply to amounts paid or accrued after December 31, 2010.”

Amendment by Pub. L. 111–147 applicable to obligations issued after the date which is 2 years after Mar. 18, 2010, see section 502(f) of Pub. L. 111–147, set out as a note under section 149 of this title.

Pub. L. 111–5, div. B, title I, § 1232(c), Feb. 17, 2009, 123 Stat. 341, provided that:“(1)Suspension.—The amendments made by subsection (a) [amending this section] shall apply to obligations issued after August 31, 2008, in taxable years ending after such date.“(2)Interest rate authority.—The amendments made by subsection (b) [amending this section] shall apply to obligations issued after December 31, 2009, in taxable years ending after such date.”

Pub. L. 110–142, § 3(b), Dec. 20, 2007, 121 Stat. 1804, provided that: “The amendment made by this section [amending this section] shall apply to amounts paid or accrued after December 31, 2007.”

Pub. L. 109–432, div. A, title IV, § 419(d), Dec. 20, 2006, 120 Stat. 2968, provided that: “The amendments made by this section [amending this section and section 6050H of this title] shall apply to amounts paid or accrued after December 31, 2006.”

Pub. L. 109–222, title V, § 501(c), May 17, 2006, 120 Stat. 354, provided that: “The amendments made by this section [amending this section] shall apply to taxable years beginning on or after the date of the enactment of this Act [May 17, 2006].”

Amendment by Pub. L. 109–135 effective as if included in the provision of the American Jobs Creation Act of 2004, Pub. L. 108–357, to which such amendment relates, see section 403(nn) of Pub. L. 109–135, set out as a note under section 26 of this title.

Pub. L. 108–357, title VIII, § 838(b), Oct. 22, 2004, 118 Stat. 1597, provided that: “The amendments made by this section [amending this section] shall apply to transactions in taxable years beginning after the date of the enactment of this Act [Oct. 22, 2004].”

Pub. L. 108–357, title VIII, § 841(c), Oct. 22, 2004, 118 Stat. 1598, provided that: “The amendments made by this section [amending this section and section 267 of this title] shall apply to payments accrued on or after the date of the enactment of this Act [Oct. 22, 2004].”

Pub. L. 108–357, title VIII, § 845(e), Oct. 22, 2004, 118 Stat. 1601, provided that: “The amendments made by this section [amending this section] shall apply to debt instruments issued after October 3, 2004.”

Amendment by Pub. L. 108–27 applicable, except as otherwise provided, to taxable years beginning after Dec. 31, 2002, see section 302(f) of Pub. L. 108–27, set out as an Effective and Termination Dates of 2003 Amendment note under section 1 of this title.

Amendment by Pub. L. 106–170 applicable to taxable years beginning after Dec. 31, 2000, see section 546(a) of Pub. L. 106–170, set out as a note under section 856 of this title.

Amendment by Pub. L. 105–277 effective as if included in the provision of the Taxpayer Relief Act of 1997, Pub. L. 105–34, to which such amendment relates, see section 4003(l) of Pub. L. 105–277, set out as a note under section 86 of this title.

Amendment by section 312(d)(1) of Pub. L. 105–34 applicable to sales and exchanges after May 6, 1997, with certain exceptions, see section 312(d) of Pub. L. 105–34, set out as a note under section 121 of this title.

Pub. L. 105–34, title V, § 503(d), Aug. 5, 1997, 111 Stat. 853, provided that:“(1)In general.—The amendments made by this section [amending this section and sections 2053, 6166, and 6601 of this title] shall apply to estates of decedents dying after December 31, 1997.“(2)Election.—In the case of the estate of any decedent dying before January 1, 1998, with respect to which there is an election under section 6166 of the Internal Revenue Code of 1986, the executor of the estate may elect to have the amendments made by this section apply with respect to installments due after the effective date of the election; except that the 2-percent portion of such installments shall be equal to the amount which would be the 4-percent portion of such installments without regard to such election. Such an election shall be made before January 1, 1999 in the manner prescribed by the Secretary of the Treasury and, once made, is irrevocable.”

Pub. L. 105–34, title X, § 1005(b), Aug. 5, 1997, 111 Stat. 912, provided that:“(1)In general.—The amendment made by this section [amending this section] shall apply to disqualified debt instruments issued after June 8, 1997.“(2)Transition rule.—The amendment made by this section shall not apply to any instrument issued after June 8, 1997, if such instrument is—“(A) issued pursuant to a written agreement which was binding on such date and at all times thereafter,“(B) described in a ruling request submitted to the Internal Revenue Service on or before such date, or“(C) described on or before such date in a public announcement or in a filing with the Securities and Exchange Commission required solely by reason of the issuance.”

Amendment by section 1703(n)(4) of Pub. L. 104–188 effective as if included in the provision of the Revenue Reconciliation Act of 1993, Pub. L. 103–66, §§ 13001–13444, to which such amendment relates, see section 1703(o) of Pub. L. 104–188, set out as a note under section 39 of this title.

Pub. L. 104–188, title I, § 1704(f)(2)(C), Aug. 20, 1996, 110 Stat. 1879, provided that: “The amendments made by this paragraph [amending this section] shall apply as if included in the amendments made by section 7210(a) of the Revenue Reconciliation Act of 1989 [Pub. L. 101–239].”

Amendment by section 13206(d)(1) of Pub. L. 103–66 applicable to taxable years beginning after Dec. 31, 1992, see section 13206(d)(3) of Pub. L. 103–66 set out as a note under section 1 of this title.

Pub. L. 103–66, title XIII, § 13228(d), Aug. 10, 1993, 107 Stat. 495, provided that: “The amendments made by this section [amending this section] shall apply to interest paid or accrued in taxable years beginning after December 31, 1993.”

Amendment by Pub. L. 101–508 effective, except as otherwise provided, as if included in the provision of the Revenue Reconciliation Act of 1989, Pub. L. 101–239, title VII, to which such amendment relates, see section 11701(n) of Pub. L. 101–508, set out as a note under section 42 of this title.

Pub. L. 101–239, title VII, § 7202(c), Dec. 19, 1989, 103 Stat. 2332, provided that:“(1)In general.—Except as provided in paragraph (2), the amendments made by this section [amending this section] shall apply to instruments issued after July 10, 1989.“(2)Exceptions.—“(A) The amendments made by this section shall not apply to any instrument if—“(i) such instrument is issued in connection with an acquisition—“(I) which is made on or before July 10, 1989,“(II) for which there was a written binding contract in effect on July 10, 1989, and at all times thereafter before such acquisition, or“(III) for which a tender offer was filed with the Securities and Exchange Commission on or before July 10, 1989,“(ii) the term of such instrument is not greater than—“(I) the term specified in the written documents described in clause (iii), or“(II) if no term is determined under subclause (I), 10 years, and“(iii) the use of such instrument in connection with such acquisition (and the maximum amount of proceeds from such instrument) was determined on or before July 10, 1989, and such determination is evidenced by written documents—“(I) which were transmitted on or before July 10, 1989, between the issuer and any governmental regulatory bodies or prospective parties to the issuance or acquisition, and“(II) which are customarily used for the type of acquisition or financing involved.“(B) The amendments made by this section shall not apply to any instrument issued pursuant to the terms of a debt instrument issued on or before July 10, 1989, or described in subparagraph (A) or (D).“(C) The amendments made by this section shall not apply to any instrument issued to refinance an original issue discount debt instrument to which the amendments made by this section do not apply if—“(i) the maturity date of the refinancing instrument is not later than the maturity date of the refinanced instrument,“(ii) the issue price of the refinancing instrument does not exceed the adjusted issue price of the refinanced instrument,“(iii) the stated redemption price at maturity of the refinancing instrument is not greater than the stated redemption price at maturity of the refinanced instrument, and“(iv) the interest payments required under the refinancing instrument before maturity are not less than (and are paid not later than) the interest payments required under the refinanced instrument.“(D) The amendments made by this section shall not apply to instruments issued after July 10, 1989, pursuant to a reorganization plan in a title 11 or similar case (as defined in section 368(a)(3) of the Internal Revenue Code of 1986) if the amount of proceeds of such instruments, and the maturities of such instruments, do not exceed the amount or maturities specified in the last reorganization plan filed in such case on or before July 10, 1989.”

Pub. L. 101–239, title VII, § 7210(b), Dec. 19, 1989, 103 Stat. 2342, provided that:“(1)In general.—The amendment made by this section [amending this section] shall apply to interest paid or accrued in taxable years beginning after July 10, 1989.“(2)Special rule for demand loans, etc.—In the case of any demand loan (or other loan without a fixed term) which was outstanding on July 10, 1989, interest on such loan to the extent attributable to periods before September 1, 1989, shall not be treated as disqualified interest for purposes of section 163(j) of the Internal Revenue Code of 1986 (as added by subsection (a)).”

Pub. L. 100–647, title I, § 1005(c)(13), Nov. 10, 1988, 102 Stat. 3392, provided that: “For purposes of applying the amendments made by this subsection [amending this section and sections 467, 1255, and 7872 of this title] and the amendments made by section 10102 of the Revenue Act of 1987 [section 10102 of Pub. L. 100–203, amending this section], the provisions of this subsection shall be treated as having been enacted immediately before the enactment of the Revenue Act of 1987.”

Amendment by sections 1006(u)(1) and 1009(b)(6) of Pub. L. 100–647 effective, except as otherwise provided, as if included in the provision of the Tax Reform Act of 1986, Pub. L. 99–514, to which such amendment relates, see section 1019(a) of Pub. L. 100–647, set out as a note under section 1 of this title.

Amendment by section 2004(b)(1) of Pub. L. 100–647 effective, except as otherwise provided, as if included in the provisions of the Revenue Act of 1987, Pub. L. 100–203, title X, to which such amendment relates, see section 2004(u) of Pub. L. 100–647, set out as a note under section 56 of this title.

Pub. L. 100–203, title X, § 10102(c), Dec. 22, 1987, 101 Stat. 1330–386, provided that: “The amendments made by this section [amending this section] shall apply to taxable years beginning after December 31, 1987.”

Amendment by section 10212(b) of Pub. L. 100–203 effective as if included in the amendments made by section 501 of the Tax Reform Act of 1986, Pub. L. 99–514, see section 10212(c) of Pub. L. 100–203, set out as a note under section 58 of this title.

Pub. L. 99–514, title V, § 511(e), Oct. 22, 1986, 100 Stat. 2249, provided that: “The amendments made by this section [amending this section and sections 467, 703, 1255, 1363, and 7872 of this title] shall apply to taxable years beginning after December 31, 1986.”

Amendment by section 902(e)(1) of Pub. L. 99–514 applicable to taxable years ending after Dec. 31, 1986, with certain exceptions and qualifications, see section 902(f) of Pub. L. 99–514, set out as a note under section 265 of this title.

Amendment by section 1301(j)(3) of Pub. L. 99–514 applicable to bonds issued after Aug. 15, 1986, except as otherwise provided, see sections 1311 to 1318 of Pub. L. 99–514, set out as an Effective Date; Transitional Rules note under section 141 of this title.

Amendment by sections 1803(a)(4) and 1810(e)(1) of Pub. L. 99–514 effective, except as otherwise provided, as if included in the provisions of the Tax Reform Act of 1984, Pub. L. 98–369, div. A, to which such amendment relates, see section 1881 of Pub. L. 99–514, set out as a note under section 48 of this title.

Amendment by section 42(a)(3) of Pub. L. 98–369 applicable to taxable years ending after July 18, 1984, see section 44 of Pub. L. 98–369, set out as an Effective Date note under section 1271 of this title.

Pub. L. 98–369, div. A, title I, § 56(d), July 18, 1984, 98 Stat. 574, provided that: “The amendments made by this section [amending this section and sections 263 and 265 of this title] shall apply to short sales after the date of enactment of this Act [July 18, 1984] in taxable years ending after such date.”

Amendment by section 127(f) of Pub. L. 98–369 applicable to interest received after July 18, 1984, with respect to obligations issued after such date, in taxable years ending after such date, see section 127(g)(1) of Pub. L. 98–369, set out as a note under section 871 of this title.

Amendment by section 128(c) of Pub. L. 98–369 applicable to obligations issued after June 9, 1984, see section 128(d)(2) of Pub. L. 98–369, set out as a note under section 871 of this title.

Amendment by section 612(c) of Pub. L. 98–369 applicable to interest paid or accrued after Dec. 31, 1984, on indebtedness incurred after Dec. 31, 1984, see section 612(g) of Pub. L. 98–369, set out as an Effective Date note under section 25 of this title.

Amendment by Pub. L. 97–354 applicable to taxable years beginning after Dec. 31, 1982, see section 6(a) of Pub. L. 97–354, set out as an Effective Date note under section 1361 of this title.

Amendment by Pub. L. 97–248 applicable to obligations issued after Dec. 31, 1982, with exceptions for certain warrants, see section 310(d) of Pub. L. 97–248, set out as a note under section 103 of this title.

Amendment by section 205(c)(3) of Pub. L. 94–455 applicable with respect to taxable years ending after Dec. 31, 1975, see section 205(e) of Pub. L. 94–455, set out as an Effective Date note under section 1254 of this title.

Pub. L. 94–455, title II, § 209(b), Oct. 4, 1976, 90 Stat. 1543, as amended by Pub. L. 99–514, § 2, Oct. 22, 1986, 100 Stat. 2095, provided that:“(1)In general.—Except as provided in paragraph (2), the amendments made by subsection (a) [amending this section] shall apply to taxable years beginning after December 31, 1975.“(2)Indebtedness incurred before september 11, 1975.—In the case of indebtedness attributable to a specific item of property which—“(A) is for a specified term, and“(B) was incurred before September 11, 1975, or is incurred after September 10, 1975, pursuant to a written contract or commitment which on September 11, 1975, and at all times thereafter before the incurring of such indebtedness, is binding on the taxpayer,the amendments made by this section shall not apply, but section 163(d) of the Internal Revenue Code of 1986 [formerly I.R.C. 1954] (as in effect before the enactment of this Act [Oct. 4, 1976]) shall apply. For purposes of the preceding sentence, so much of the net investment income (as defined in section 163(d)(3)(A) of such Code) for any taxable year as is not taken into account under section 163(d) of such Code, as amended by this Act, by reason of the last sentence of section 163(d)(3)(A) of such Code, shall be taken into account for purposes of applying such section as in effect before the date of enactment of this Act [Oct. 4, 1976] with respect to interest on indebtedness referred to in the preceding sentence.”

Amendment by section 1901(b)(8)(C), (3)(K) of Pub. L. 94–455 applicable with respect to taxable years beginning after Dec. 31, 1976, see section 1901(d) of Pub. L. 94–455, set out as a note under section 2 of this title.

Pub. L. 92–178, title III, § 304(e), Dec. 10, 1971, 85 Stat. 524, provided that: “The amendments made by this section to section 57 of the Internal Revenue Code of 1954 shall apply to taxable years beginning after December 31, 1969. The amendments made by this section to section 163 of such Code shall apply to taxable years beginning after December 31, 1971.”

Pub. L. 91–172, title II, § 221(b), Dec. 30, 1969, 83 Stat. 576, provided that: “The amendments made by this section [amending this section] shall apply to taxable years beginning after December 31, 1971.”

Pub. L. 88–272, title II, § 224(d), Feb. 26, 1964, 78 Stat. 79, provided that: “The amendments made by subsections (a) [enacting section 483 of this title] and (b) [amending the analysis preceding section 481 of this title] shall apply to payments made after December 31, 1963, on account of sales or exchanges of property occurring after June 30, 1963, other than any sale or exchange made pursuant to a binding written contract (including an irrevocable written option) entered into before July 1, 1963. The amendments made by subsection (c) [amending this section] shall apply to payments made during taxable years beginning after December 31, 1963.”

Subsec. (c) effective as of Jan. 1, 1962, and applicable with respect to taxable years ending on or after such date, see section 2 of Pub. L. 88–9, set out as an Effective Date note under section 1055 of this title.

For provisions that nothing in amendment by section 401(b)(12) of Pub. L. 115–141 be construed to affect treatment of certain transactions occurring, property acquired, or items of income, loss, deduction, or credit taken into account prior to Mar. 23, 2018, for purposes of determining liability for tax for periods ending after Mar. 23, 2018, see section 401(e) of Pub. L. 115–141, set out as a note under section 23 of this title.

Pub. L. 100–647, title I, § 1005(c)(14), Nov. 10, 1988, 102 Stat. 3392, provided that:“(A) For purposes of applying section 163(h) of the 1986 Code to any taxable year beginning during 1987, if, incident to a divorce or legal separation—“(i) an individual acquires the interest of a spouse or former spouse in a qualified residence in a transfer to which section 1041 of the 1986 Code applies, and“(ii) such individual incurs indebtedness which is secured by such qualified residence,the amount determined under paragraph (3)(B)(ii)(I) of section 163(h) of the 1986 Code (as in effect before the amendments made by the Revenue Act of 1987 [Pub. L. 100–203, title X]) with respect to such qualified residence shall be increased by the amount determined under subparagraph (B).“(B) The amount determined under this subparagraph shall be equal to the excess (if any) of—“(i) the lesser of the amount of the indebtedness described in subparagraph (A)(ii), or the fair market value of the spouse’s or former spouse’s interest in the qualified residence as of the time of the transfer, over“(ii) the basis of the spouse or former spouse in such interest in such residence (adjusted only by the cost of any improvements to such residence).”

For provisions directing that if any amendments made by subtitle A or subtitle C of title XI [§§ 1101–1147 and 1171–1177] or title XVIII [§§ 1800–1899A] of Pub. L. 99–514 require an amendment to any plan, such plan amendment shall not be required to be made before the first plan year beginning on or after Jan. 1, 1989, see section 1140 of Pub. L. 99–514, as amended, set out as a note under section 401 of this title.

Pub. L. 98–369, div. A, title X, § 1066, July 18, 1984, 98 Stat. 1048, as amended by Pub. L. 99–514, § 2, Oct. 22, 1986, 100 Stat. 2095, provided that:“(a)In General.—If—“(1) a corporation had an election in effect under subchapter S of the Internal Revenue Code of 1986 [formerly I.R.C. 1954] for the taxable years of such corporation beginning in 1982, 1983, and 1984, and“(2) a shareholder of such corporation makes an election to have this section apply,then any qualified income which such shareholder takes into account by reason of holding stock in such corporation for any taxable year of such corporation beginning in 1983 or 1984 shall be treated for purposes of section 163(d) of the Internal Revenue Code of 1986 as such income would have been treated but for the enactment of the Subchapter S Revision Act of 1982 [Pub. L. 97–354, see Tables for classification].“(b)Qualified Income.—For purposes of subsection (a), the term ‘qualified income’ means any income other than income which is attributable to personal services performed by the shareholder for the corporation.“(c)Election.—The election under subsection (a)(2) shall be made at such time and in such manner as the Secretary of the Treasury or his delegate may by regulations prescribe.”

For provision that, for purposes of amendments by section 231(b) of Pub. L. 97–248, any evidence of indebtedness issued pursuant to a written commitment which was binding on July 1, 1982, and at all times thereafter be treated as issued on July 1, 1982, see section 231(e) of Pub. L. 97–248, set out as a note under section 1232A of this title.