26 U.S.C. § 55 — Alternative minimum tax imposed
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The exemption amount of any taxpayer shall be reduced (but not below zero) by an amount equal to 25 percent of the amount by which the alternative minimum taxable income of the taxpayer exceeds— (A) $150,000 in the case of a taxpayer described in paragraph (1)(A), (B) $112,500 in the case of a taxpayer described in paragraph (1)(B), and (C) 50 percent of the dollar amount applicable under subparagraph (A) in the case of a taxpayer described in subparagraph (C) or (D) of paragraph (1). In the case of a taxpayer described in paragraph (1)(C), alternative minimum taxable income shall be increased by the lesser of (i) 25 percent of the excess of alternative minimum taxable income (determined without regard to this sentence) over the minimum amount of such income (as so determined) for which the exemption amount under paragraph (1)(C) is zero, or (ii) such exemption amount (determined without regard to this paragraph).
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