(a) Affiliated group definedFor purposes of this subtitle—(1) In generalThe term “affiliated group” means—(A) 1 or more chains of includible corporations connected through stock ownership with a common parent corporation which is an includible corporation, but only if—
(B)(i) the common parent owns directly stock meeting the requirements of paragraph (2) in at least 1 of the other includible corporations, and
(ii) stock meeting the requirements of paragraph (2) in each of the includible corporations (except the common parent) is owned directly by 1 or more of the other includible corporations.
(2) 80-percent voting and value testThe ownership of stock of any corporation meets the requirements of this paragraph if it—(A) possesses at least 80 percent of the total voting power of the stock of such corporation, and
(B) has a value equal to at least 80 percent of the total value of the stock of such corporation.
(3) 5 years must elapse before reconsolidation(A) In generalIf—(i) a corporation is included (or required to be included) in a consolidated return filed by an affiliated group, and
(ii) such corporation ceases to be a member of such group,
with respect to periods after such cessation, such corporation (and any successor of such corporation) may not be included in any consolidated return filed by the affiliated group (or by another affiliated group with the same common parent or a successor of such common parent) before the 61st month beginning after its first taxable year in which it ceased to be a member of such affiliated group.
(B) Secretary may waive application of subparagraph (A)
(4) Stock not to include certain preferred stockFor purposes of this subsection, the term “stock” does not include any stock which—(A) is not entitled to vote,
(B) is limited and preferred as to dividends and does not participate in corporate growth to any significant extent,
(C) has redemption and liquidation rights which do not exceed the issue price of such stock (except for a reasonable redemption or liquidation premium), and
(D) is not convertible into another class of stock.
(5) RegulationsThe Secretary shall prescribe such regulations as may be necessary or appropriate to carry out the purposes of this subsection, including (but not limited to) regulations—(A) which treat warrants, obligations convertible into stock, and other similar interests as stock, and stock as not stock,
(B) which treat options to acquire or sell stock as having been exercised,
(C) which provide that the requirements of paragraph (2)(B) shall be treated as met if the affiliated group, in reliance on a good faith determination of value, treated such requirements as met,
(D) which disregard an inadvertent ceasing to meet the requirements of paragraph (2)(B) by reason of changes in relative values of different classes of stock,
(E) which provide that transfers of stock within the group shall not be taken into account in determining whether a corporation ceases to be a member of an affiliated group, and
(F) which disregard changes in voting power to the extent such changes are disproportionate to related changes in value.
(Aug. 16, 1954, ch. 736, 68A Stat. 369; Mar. 13, 1956, ch. 83, § 5(8), 70 Stat. 49; Pub. L. 85–866, title I, § 64(d)(3), Sept. 2, 1958, 72 Stat. 1657; Pub. L. 86–69, § 3(f)(1), June 25, 1959, 73 Stat. 140; Pub. L. 86–376, § 2(c), Sept. 23, 1959, 73 Stat. 699; Pub. L. 86–779, § 10(j), Sept. 14, 1960, 74 Stat. 1009; Pub. L. 89–389, § 4(b)(3), Apr. 14, 1966, 80 Stat. 116; Pub. L. 91–172, title I, § 121(a)(4), Dec. 30, 1969, 83 Stat. 537; Pub. L. 92–178, title V, § 502(e), Dec. 10, 1971, 85 Stat. 550; Pub. L. 94–455, title VIII, § 803(b)(3), title X, §§ 1051(g), 1053(d)(2), title XV, § 1507(a), Oct. 4, 1976, 90 Stat. 1584, 1646, 1649, 1739; Pub. L. 95–600, title I, § 141(f)(4), Nov. 6, 1978, 92 Stat. 2795; Pub. L. 96–222, title I, § 101(a)(7)(L)(i)(VIII), (iv)(II), Apr. 1, 1980, 94 Stat. 199, 200; Pub. L. 98–369, div. A, title I, § 60(a), title II, § 211(b)(20), July 18, 1984, 98 Stat. 577, 756; Pub. L. 99–514, title X, § 1024(c)(15), (16), title XVIII, §§ 1804(e)(1), (10), 1899A(35), Oct. 22, 1986, 100 Stat. 2408, 2800, 2804, 2960; Pub. L. 100–647, title I, § 1018(d)(10), Nov. 10, 1988, 102 Stat. 3581; Pub. L. 101–508, title XI, § 11814(b), Nov. 5, 1990, 104 Stat. 1388–557; Pub. L. 104–188, title I, §§ 1308(d)(2), 1702(h)(6), Aug. 20, 1996, 110 Stat. 1783, 1874; Pub. L. 113–295, div. A, title II, § 221(a)(93), Dec. 19, 2014, 128 Stat. 4050; Pub. L. 115–141, div. U, title IV, § 401(d)(1)(D)(xvii)(I), Mar. 23, 2018, 132 Stat. 1208.)