26 U.S.C. § 6659
Section 6659 · 6659 to 6661. Repealed. Pub. L. 101239, title VII, 7721(c)(2), Dec. 19, 1989, 103 Stat. 2399]
Applied in 114 court decisions — leading case Heasley v. Commissioner (1990)
Most recently applied in Lyerly v. United States (November 2016)
Cases citing this section usually also cite 26 U.S.C. § 6653 · 26 U.S.C. § 6621 · 26 U.S.C. § 6651
How often courts cite this section
Court decisions citing this, by year.Markers show enactment, consequential amendments, and circuit splits over this section — watch for a citation surge after a change or a disagreement. The dip in the last several years is a data-coverage gap, not a real trend — our corpus holds fewer opinions from the most recent years, so recent citations are undercounted.
Section 6659, added Pub. L. 97–34, title VII, § 722(a)(1), Aug. 13, 1981, 95 Stat. 341; amended Pub. L. 97–448, title I, § 107(a)(1), (2), Jan. 12, 1983, 96 Stat. 2391; Pub. L. 98–369, div. A, title I, 155(c)(1), title VII, 721(x)(4), July 18, 1984, 98 Stat. 693, 971, related to additions to tax in case of valuation overstatements for purposes of the income tax. A prior section 6659 was renumbered section 6662 of this title. Section 6659A, added Pub. L. 99–514, title XI, § 1138(a), Oct. 22, 1986, 100 Stat. 2486, related to additions to tax in case of overstatements of pension liabilities. Section 6660, added Pub. L. 98–369, div. A, title I, 155(c)(2)(A), July 18, 1984, 98 Stat. 694; amended Pub. L. 99–514, title XVIII, §§ 1811(d), 1899A (57), Oct. 22, 1986, 100 Stat. 2833, 2961, related to additions to tax in case of valuation understatements for purposes of estate or gift taxes. A prior section 6660 was renumbered section 6662 of this title. Section 6661, added Pub. L. 97–248, title III, § 323(a), Sept. 3, 1982, 96 Stat. 613; amended Pub. L. 97–354, § 5(a)(42), Oct. 19, 1982, 96 Stat. 1697; Pub. L. 98–369, div. A, title VII, 714(h)(3), July 18, 1984, 98 Stat. 962; Pub. L. 99–509, title VIII, § 8002(a), (c), Oct. 21, 1986, 100 Stat. 1951; Pub. L. 99–514, title XV, § 1504(a), Oct. 22, 1986, 100 Stat. 2743, related to substantial understatements of liability.