Section, added and amended Pub. L. 111–148, title IX, § 9001(a), title X, § 10901(a), (b), Mar. 23, 2010, 124 Stat. 847, 1015, 1016; Pub. L. 111–152, title I, § 1401(a), Mar. 30, 2010, 124 Stat. 1059; Pub. L. 114–113, div. P, title I, §§ 101(b), 102, Dec. 18, 2015, 129 Stat. 3037; Pub. L. 114–255, div. C, title XVIII, § 18001(a)(4), Dec. 13, 2016, 130 Stat. 1342; Pub. L. 115–97, title I, § 11002(d)(12), Dec. 22, 2017, 131 Stat. 2062; Pub. L. 115–141, div. U, title IV, § 401(a)(237), (238), Mar. 23, 2018, 132 Stat. 1195, related to excise tax on high cost employer-sponsored health coverage.

Repeal applicable to taxable years beginning after Dec. 31, 2019, see section 503(c) of Pub. L. 116–94, set out as an Effective Date of 2019 Amendment note under section 6051 of this title.