2004—Subsec. (b). Pub. L. 108–357, § 251(b), inserted at end “No amount shall be required to be deducted and withheld under chapter 24 with respect to any increase in income attributable to a disposition described in the preceding sentence.”

Subsec. (d). Pub. L. 108–357, § 905(a), added subsec. (d).

1990—Subsec. (a). Pub. L. 101–508, § 11801(c)(9)(B)(i)(I), substituted “422(a) or 423(a)” for “422(a), 422A(a), 423(a), or 424(a)” in introductory provisions.

Subsec. (a)(1). Pub. L. 101–508, § 11801(c)(9)(B)(i)(II), struck out “except as provided in section 422 (c)(1),” before “no income”.

Subsec. (a)(2). Pub. L. 101–508, § 11801(c)(9)(B)(i)(III), substituted “424(a)” for “425(a)”.

Subsec. (b). Pub. L. 101–508, § 11801(c)(9)(B)(ii), substituted “422(a) or 423(a)” for “422(a), 422A(a), 423(a), or 424(a)” and “422(a)(1) or 423(a)(1),” for “422(a)(1), 422A(a)(1), 423(a)(1), or 424(a)(1),”.

Subsec. (c)(1)(A). Pub. L. 101–508, § 11801(c)(9)(B)(iii)(I), substituted “422(a) and 423(a)” for “422(a), 422A(a), 423(a), and 424(a)”.

Subsec. (c)(1)(B). Pub. L. 101–508, § 11801(c)(9)(B)(iii)(II), substituted “section 423 (c)” for “sections 423 (c) and 424 (c)(1)”.

Subsec. (c)(2), (3)(A). Pub. L. 101–508, § 11801(c)(9)(B)(iii)(III), substituted “423(c)” for “422(c)(1), 423(c), or 424(c)(1)” wherever appearing.

Subsec. (c)(3)(B). Pub. L. 101–508, § 11801(c)(9)(B)(iii)(IV), (V), substituted “section 423 (c)” for “sections 422 (c)(1), 423 (c), and 424 (c)(1)” and “such section” for “such sections”.

1981—Subsecs. (a), (b), (c)(1)(A). Pub. L. 97–34 inserted references to section 422A (a) in subsecs. (a), (b), and (c)(1)(A) and to section 422A (a)(1) in subsec. (b).

1964—Pub. L. 88–272 amended section generally, and among other changes, inserted provisions relating to the effect of a qualifying transfer, and to the basis of shares acquired when an option is exercised by an estate, and omitted provisions relating to treatment of restricted stock options, a special rule where option price was between 85 percent and 95 percent of value of stock, acquisition of new stock, definitions, modification, extension, or renewal of option, and corporate reorganizations, liquidations, etc. See sections 421 to 425 of this title.

1958—Subsec. (a). Pub. L. 85–866, § 25, inserted sentence authorizing substitution of “grantor corporation” or “corporation issuing or assuming a stock option in a transaction to which subsection (g) is applicable” for “employer corporation”.

Subsec. (d)(6)(C). Pub. L. 85–320 added subpar. (C).

Subsec. (d)(1)(A)(ii). Pub. L. 85–866, § 26(a)(1), substituted “in the case of a variable price option” for “in case the purchase price of the stock under the option is fixed or determinable under a formula in which the only variable is the value of the stock at any time during a period of 6 months which includes the time the option is exercised” and inserted “fair” before “market value”.

Subsec. (d)(7). Pub. L. 85–866, § 26(a)(2), added par. (7).

Pub. L. 108–357, title II, § 251(d), Oct. 22, 2004, 118 Stat. 1459, provided that: “The amendments made by this section [amending this section, sections 423, 3121, 3231, and 3306 of this title, and section 409 of Title 42, The Public Health and Welfare] shall apply to stock acquired pursuant to options exercised after the date of the enactment of this Act [Oct. 22, 2004].”

Pub. L. 108–357, title VIII, § 905(b), Oct. 22, 2004, 118 Stat. 1653, provided that: “The amendment made by this section [amending this section] shall apply to sales after the date of the enactment of this Act [Oct. 22, 2004].”

Amendment by Pub. L. 97–34 applicable with respect to options granted on or after Jan. 1, 1976, and exercised on or after Jan. 1, 1981, or outstanding on Jan. 1, 1981, or granted on or after Jan. 1, 1976, and outstanding Aug. 13, 1981, see section 251(c) of Pub. L. 97–34, set out as an Effective Date note under section 422 of this title.

Section 221(e) of Pub. L. 88–272, as amended by Pub. L. 99–514, § 2, Oct. 22, 1986, 100 Stat. 2095, provided that:

“(1) Except as provided in paragraphs (2) and (3), the amendments made by this section [enacting sections 422 to 425 and 6039, amending this section, sections 402, 691, 6652, 6678, and the analysis preceding sections 401 and 6031, and renumbering section 3039 as 3040 of this title] shall apply to taxable years ending after December 31, 1963.

“(2) The amendments made by paragraphs (1) and (3) of subsection (b) [enacting section 3039, renumbering former section 3039 as 3040, and amending section 6678 of this title] and paragraph (2) of section 6652(a) of the Internal Revenue Code of 1986 [formerly I.R.C. 1954] (as amended by paragraph (2) of subsection (b)), shall apply to stock transferred pursuant to options exercised on or after January 1, 1964.

“(3) In the case of an option granted after December 31, 1963, and before January 1, 1965—

“(A) paragraphs (1) and (2) of section 422(b) of the Internal Revenue Code of 1986 (as added by subsection (a)), shall not apply, and

“(B) paragraph (1) of section 425(h) of such Code (as added by subsection (a)), shall not apply to any change in the terms of such option made before January 1, 1965, to permit such option to qualify under paragraphs (3), (4), and (5) of such section 422 (b).”

Amendment by section 25 of Pub. L. 85–866 applicable to taxable years beginning after Dec. 31, 1953, and ending after Aug. 16, 1954, see section 1(c)(1) of Pub. L. 85–866, set out as a note under section 165 of this title.

Section 26(b) of Pub. L. 85–866 provided that: “The amendments made by subsection (a) [amending this section] shall apply with respect to taxable years ending after September 30, 1958.”

Section 3 of Pub. L. 85–320 provided that: “The amendments made by this Act [amending this section and section 1014 of this title] shall apply with respect to taxable years ending after December 31, 1956, but only in the case of employees dying after such date.”

For provisions that nothing in amendment by Pub. L. 101–508 be construed to affect treatment of certain transactions occurring, property acquired, or items of income, loss, deduction, or credit taken into account prior to Nov. 5, 1990, for purposes of determining liability for tax for periods ending after Nov. 5, 1990, see section 11821(b) of Pub. L. 101–508, set out as a note under section 45K of this title.