Section 1219(a)(1), (2) of Pub. L. 109–280, which directed the amendment of section 6662 without specifying the act to be amended, was executed to this section, which is section 6662 of the Internal Revenue Code of 1986, to reflect the probable intent of Congress. See 2006 Amendment notes below.

A prior section 6662, acts Aug. 16, 1954, ch. 736, 68A Stat. 827, § 6659; May 14, 1960, Pub. L. 86–470, § 1, 74 Stat. 132; Dec. 30, 1969, Pub. L. 91–172, title I, § 101(j)(51), 83 Stat. 531; Sept. 2, 1974, Pub. L. 93–406, title II, § 1016(a)(19), 88 Stat. 931; renumbered § 6660, Aug. 13, 1981, Pub. L. 97–34, title VII, § 722(a)(1), 95 Stat. 341; renumbered § 6662, Sept. 3, 1982, Pub. L. 97–248, title III, § 323(a), 96 Stat. 613, directed that additions be treated as tax and set procedure for assessing certain additions to tax, prior to repeal by Pub. L. 101–239, title VII, § 7721(a), Dec. 19, 1989, 103 Stat. 2395, applicable to returns the due date for which (determined without regard to extensions) is after Dec. 31, 1989. See section 6665 of this title.

2006—Subsec. (e)(1)(A). Pub. L. 109–280, § 1219(a)(1)(A), substituted “150 percent” for “200 percent”. See Codification note above.

Subsec. (g)(1). Pub. L. 109–280, § 1219(a)(1)(B), substituted “65 percent” for “50 percent”. See Codification note above.

Subsec. (h)(2)(A)(i), (ii). Pub. L. 109–280, § 1219(a)(2)(A), amended cls. (i) and (ii) generally. Prior to amendment, cls. (i) and (ii) read as follows:

“(i) ‘400 percent’ for ‘200 percent’ each place it appears,

“(ii) ‘25 percent’ for ‘50 percent’, and”.

Subsec. (h)(2)(C). Pub. L. 109–280, § 1219(a)(2)(B), substituted “ ‘40 percent’ for ‘65 percent’ ” for “ ‘25 percent’ for ‘50 percent’ ”. See Codification note above.

2005—Subsec. (b). Pub. L. 109–135, § 403(x)(1), inserted at end “Except as provided in paragraph (1) or (2)(B) of section 6662A (e), this section shall not apply to the portion of any underpayment which is attributable to a reportable transaction understatement on which a penalty is imposed under section 6662A.”

Subsec. (d)(3). Pub. L. 109–135, § 412(aaa), struck out “the” before “1 or more”.

2004—Pub. L. 108–357, § 812(e)(1), inserted “on underpayments” after “penalty” in section catchline.

Subsec. (d)(1)(B). Pub. L. 108–357, § 819(a), reenacted heading without change and amended text of subpar. (B) generally. Prior to amendment, text read as follows: “In the case of a corporation other than an S corporation or a personal holding company (as defined in section 542), paragraph (1) shall be applied by substituting ‘$10,000’ for ‘$5,000’.”

Subsec. (d)(2)(A). Pub. L. 108–357, § 812(b), inserted concluding provisions.

Subsec. (d)(2)(C). Pub. L. 108–357, § 812(d), amended subpar. (C) generally, substituting provisions relating to inapplicability of subpar. (B) to any item attributable to a tax shelter and defining the term “tax shelter” for provisions relating to, in the case of any item of a taxpayer other than a corporation which is attributable to a tax shelter, inapplicability of subpar. (B)(ii) and inapplicability of subpar. (B)(i), unless the taxpayer reasonably believed that the tax treatment of such item by the taxpayer was more likely than not the proper treatment, inapplicability of subpar. (B) to any item of a corporation which is attributable to a tax shelter, and provisions defining the term “tax shelter”.

Subsec. (d)(2)(D). Pub. L. 108–357, § 819(b)(2), struck out heading and text of subpar. (D). Text read as follows: “The Secretary shall prescribe (and revise not less frequently than annually) a list of positions—

“(i) for which the Secretary believes there is not substantial authority, and

“(ii) which affect a significant number of taxpayers.

Subsec. (d)(3). Pub. L. 108–357, § 819(b)(1), added par. (3).

1997—Subsec. (d)(2)(B). Pub. L. 105–34, § 1028(c)(1), inserted concluding provisions.

Subsec. (d)(2)(C)(iii). Pub. L. 105–34, § 1028(c)(2), substituted “a significant purpose” for “the principal purpose” in concluding provisions.

1994—Subsec. (d)(2)(C)(i). Pub. L. 103–465, § 744(b)(1), substituted “In the case of any item of a taxpayer other than a corporation which is” for “In the case of any item” in introductory provisions.

Subsec. (d)(2)(C)(ii). Pub. L. 103–465, § 744(a), added cl. (ii). Former cl. (ii) redesignated (iii).

Subsec. (d)(2)(C)(iii). Pub. L. 103–465, § 744(a), (b)(2), redesignated cl. (ii) as (iii) and substituted “this subparagraph” for “clause (i)” in introductory provisions.

1993—Subsec. (d)(2)(B)(ii). Pub. L. 103–66, § 13251(a), amended cl. (ii) generally. Prior to amendment, cl. (ii) read as follows: “any item with respect to which the relevant facts affecting the item’s tax treatment are adequately disclosed in the return or in a statement attached to the return.”

Subsec. (e)(1)(B)(ii). Pub. L. 103–66, § 13236(a), amended cl. (ii) generally. Prior to amendment, cl. (ii) read as follows: “the net section 482 transfer price adjustment for the taxable year exceeds $10,000,000.”

Subsec. (e)(3)(B). Pub. L. 103–66, § 13236(b), amended heading and text of subpar. (B) generally. Prior to amendment, text read as follows: “For purposes of determining whether the $10,000,000 threshold requirement of paragraph (1)(B)(ii) is met, there shall be excluded—

“(i) any portion of the net increase in taxable income referred to in subparagraph (A) which is attributable to any redetermination of a price if it is shown that there was a reasonable cause for the taxpayer’s determination of such price and that the taxpayer acted in good faith with respect to such price, and

“(ii) any portion of such net increase which is attributable to any transaction solely between foreign corporations unless, in the case of any of such corporations, the treatment of such transaction affects the determination of income from sources within the United States or taxable income effectively connected with the conduct of a trade or business within the United States.”

Subsec. (e)(3)(D). Pub. L. 103–66, § 13236(c), added subpar. (D).

Subsec. (h)(2)(A)(iii). Pub. L. 103–66, § 13236(d), amended cl. (iii) generally. Prior to amendment, cl. (iii) read as follows: “ ‘$20,000,000’ for ‘$10,000,000’,”.

1990—Subsec. (b)(3). Pub. L. 101–508, § 11312(b)(1), amended par. (3) generally, substituting “misstatement” for “overstatement”.

Subsec. (e). Pub. L. 101–508, § 11312(a), substituted “misstatement” for “overstatement” in heading and amended text generally. Prior to amendment, text read as follows:

“(1) In general.—For purposes of this section, there is a substantial valuation overstatement under chapter 1 if the value of any property (or the adjusted basis of any property) claimed on any return of tax imposed by chapter 1 is 200 percent or more of the amount determined to be the correct amount of such valuation or adjusted basis (as the case may be).

“(2) Limitation.—No penalty shall be imposed by reason of subsection (b)(3) unless the portion of the underpayment for the taxable year attributable to substantial valuation overstatements under chapter 1 exceeds $5,000 ($10,000 in the case of a corporation other than an S corporation or a personal holding company (as defined in section 542)).”

Subsec. (h)(2)(A). Pub. L. 101–508, § 11312(b)(2), amended subpar. (A) generally. Prior to amendment, subpar. (A) read as follows: “any substantial valuation overstatement under chapter 1 as determined under subsection (e) by substituting ‘400 percent’ for ‘200 percent’,”.

Amendment by Pub. L. 109–280 applicable to returns filed after Aug. 17, 2006, with special rule for certain easements, see section 1219(e)(1), (3) of Pub. L. 109–280, set out as a note under section 170 of this title.

Amendment by section 403(x)(1) of 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, § 812(f), Oct. 22, 2004, 118 Stat. 1580, as amended by Pub. L. 109–135, title IV, § 403(x)(3), Dec. 21, 2005, 119 Stat. 2629, provided that:

“(1) In general.—Except as provided in paragraph (2), the amendments made by this section [enacting section 6662A of this title and amending this section and section 6664 of this title] shall apply to taxable years ending after the date of the enactment of this Act [Oct. 22, 2004].

“(2) Disqualified opinions.—Section 6664(d)(3)(B) of the Internal Revenue Code of 1986 (as added by subsection (c)) shall not apply to the opinion of a tax advisor if—

“(A) the opinion was provided to the taxpayer before the date of the enactment of this Act,

“(B) the opinion relates to one or more transactions all of which were entered into before such date, and

“(C) the tax treatment of items relating to each such transaction was included on a return or statement filed by the taxpayer before such date.”

Pub. L. 108–357, title VIII, § 819(c), Oct. 22, 2004, 118 Stat. 1585, provided that: “The amendments made by this section [amending this section] shall apply to taxable years beginning after the date of the enactment of this Act [Oct. 22, 2004].”

Amendment by Pub. L. 105–34 applicable to items with respect to transactions entered into after Aug. 5, 1997, see section 1028(e)(2) of Pub. L. 105–34, set out as a note under section 6111 of this title.

Section 744(c) of Pub. L. 103–465 provided that: “The amendments made by this section [amending this section] shall apply to items related to transactions occurring after the date of the enactment of this Act [Dec. 8, 1994].”

Section 13236(e) of Pub. L. 103–66 provided that: “The amendments made by this section [amending this section] shall apply to taxable years beginning after December 31, 1993.”

Section 13251(b) of Pub. L. 103–66 provided that: “The amendment made by this section [amending this section] shall apply to returns the due dates for which (determined without regard to extensions) are after December 31, 1993.”

Section 11312(c) of Pub. L. 101–508 provided that: “The amendments made by this section [amending this section] shall apply to taxable years ending after the date of the enactment of this Act [Nov. 5, 1990].”

Part applicable to returns the due date for which (determined without regard to extensions) is after Dec. 31, 1989, see section 7721(d) of Pub. L. 101–239, set out as an Effective Date of 1989 Amendment note under section 461 of this title.