§ 291.
(a)
Reduction in certain preference items, etc.
For purposes of this subtitle, in the case of a corporation—
(1)
Section 1250 capital gain treatment
In the case of section 1250 property which is disposed of during the taxable year, 20 percent of the excess (if any) of—
(A)
the amount which would be treated as ordinary income if such property was section 1245 property, over
(B)
the amount treated as ordinary income under section 1250 (determined without regard to this paragraph),
shall be treated as gain which is ordinary income under section 1250 and shall be recognized notwithstanding any other provision of this title. Under regulations prescribed by the Secretary, the provisions of this paragraph shall not apply to the disposition of any property to the extent section 1250(a) does not apply to such disposition by reason of section 1250(d).
(2)
Reduction in percentage depletion
In the case of iron ore and coal (including lignite), the amount allowable as a deduction under section 613 with respect to any property (as defined in section 614) shall be reduced by 20 percent of the amount of the excess (if any) of—
(A)
the amount of the deduction allowable under section 613 for the taxable year (determined without regard to this paragraph), over
(B)
the adjusted basis of the property at the close of the taxable year (determined without regard to the depletion deduction for the taxable year).
(3)
Certain financial institution preference items
(4)
Amortization of pollution control facilities
(Added [Pub. L. 97–248, title II, § 204(a)], Sept. 3, 1982, [96 Stat. 423]; amended [Pub. L. 97–354, § 5(a)(27)], Oct. 19, 1982, [96 Stat. 1694]; [Pub. L. 97–448, title III, § 306(a)(2)], Jan. 12, 1983, [96 Stat. 2400]; [Pub. L. 98–369, div. A, title I, § 68(a)], (b), title VII, § 712(a)(1)(A), (2)–(4), July 18, 1984, [98 Stat. 588], 946; [Pub. L. 99–514, title II, § 201(d)(5)], title IV, §§ 411(a), (b)(2)(C)(ii), 412(b)(1), title IX, §§ 901(b)(4), (d)(4)(C), 902(c), title XVIII, §§ 1804(k)(1), (3)(A), 1854(c)(1), 1876(b)(1), Oct. 22, 1986, [100 Stat. 2140], 2225, 2227, 2378, 2380, 2382, 2809, 2878, 2898; [Pub. L. 100–418, title I, § 1941(b)(5)], Aug. 23, 1988, [102 Stat. 1324]; [Pub. L. 100–647, title I, § 1009(b)(4)], (5), Nov. 10, 1988, [102 Stat. 3449]; [Pub. L. 101–508, title XI, § 11801(c)(12)(B)], Nov. 5, 1990, [104 Stat. 1388–527]; [Pub. L. 104–188, title I], §§ 1602(b)(1), 1616(b)(5), Aug. 20, 1996, [110 Stat. 1833], 1856; [Pub. L. 110–172, § 11(g)(6)], Dec. 29, 2007, [121 Stat. 2490]; [Pub. L. 111–5, div. B, title I, § 1501(b)], Feb. 17, 2009, [123 Stat. 353].)