Section, added Pub. L. 91–518, title IX, § 901(a), Oct. 30, 1970, 84 Stat. 1341; amended Pub. L. 93–496, § 12, Oct. 28, 1974, 88 Stat. 1531; Pub. L. 94–455, title XIX, § 1906(b)(13)(A), Oct. 4, 1976, 90 Stat. 1834; Pub. L. 95–473, § 2(a)(2)(C), Oct. 17, 1978, 92 Stat. 1464; Pub. L. 96–454, § 3(b)(1), Oct. 15, 1980, 94 Stat. 2012; Pub. L. 97–261, § 6(d)(3), Sept. 20, 1982, 96 Stat. 1107; Pub. L. 99–521, § 4(3), Oct. 22, 1986, 100 Stat. 2993, related to certain payments to National Railroad Passenger Corporation.

Savings Provision For provisions that nothing in repeal 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.