case of a corporation . (2) Section 53(d)(2) of such Code is amended by inserting described in section 55(f) after in the case of a corporation . (3) Section 55(b)(1) of such Code is amended to read as follows: (1) Amount of tentative tax (A) Noncorporate taxpayers (i) In general In the case of a taxpayer other than a corporation, the tentative minimum tax for the taxable year is the sum of— (I) 26 percent of so much of the taxable excess as does not exceed $175,000, plus— (II) 28 percent of so much of the taxable excess as exceeds $175,000. The amount determined under the preceding sentence shall be reduced by the alternative minimum tax foreign tax credit for the taxable year. (ii) Taxable excess For purposes of this subsection, the term taxable excess means so much of the alternative minimum taxable income for the taxable year as exceeds the exemption amount. (iii) Married individual filing separate return In the case of a married individual filing a separate return, clause (i) shall be applied by substituting 50 percent of the dollar amount otherwise applicable under subclause (I) and subclause (II) thereof. For purposes of the preceding sentence, marital status shall be determined under section 7703. (B) Corporations In the case of a corporation described in subsection (f), the tentative minimum tax for the taxable year is— (i) 20 percent of so much of the alternative minimum taxable income for the taxable year as exceeds the exemption amount, reduced by (ii) the alternative minimum tax foreign tax credit for the taxable year. . (4) Section 55(b)(3) of such Code is amended by striking paragraph (1)(A) and inserting paragraph (1)(A)(i) . (5) Section 59(a) of such Code is amended— (A) in paragraph (1)(C), by striking section 55(b)(1) in lieu of the highest rate of tax specified in section 1 and inserting subparagraph (A)(i) or (B)(i) of section 55(b)(1) (whichever applies) in lieu of the highest rate of tax specified in section 1 or 11 (whichever applies)