100 STAT. 2326
PUBLIC LAW 99-514—OCT. 22, 1986 "(A) POST-1986 LOSS YEARS.—In the case of a loss year beginning after December 31, 1986, the net operating loss for such year under section 172(c) shall— "(i) be determined with the adjustments provided in this section and section 58, and "(ii) be reduced by the items of tax preference determined under section 57 for such year (other than subsection (a)(6) thereof). "(B) PRE-1987 YEARS.—In the case of loss years beginning before January 1, 1987, the amount of the net operating loss which may be carried over to taxable years beginning after December 31, 1986, for purposes of paragraph (2), shall be equal to the amount which may be carried from the loss year to the first taxable year of the taxpayer beginning after December 31, 1986. "(e) QUALIFIED HOUSING INTEREST.—For purposes of this part— "(1) IN GENERAL.—The term 'qualified housing interest' means interest which is paid or accrued during the taxable year on indebtedness which is incurred in acquiring, constructing, or substantially rehabilitating any property which— "(A) is the principal residence (within the meaning of section 1034) of the taxpayer at the time such interest accrues or is paid, or "(B) is a qualified dwelling which is a qualified residence (within the meaning of section 163(h)(3)). Such term also includes interest on any indebtedness resulting from the refinancing of indebtedness meeting the requirements of the preceding sentence; but only to the extent that the amount of the indebtedness resulting from such refinancing does not exceed the amount of the refinanced indebtedness immediately before the refinancing. "(2) QUALIFIED DWELLING.—The term 'qualified dwelling' means any— "(A) house, "(B) apartment, "(C) condominium, or "(D) mobile home not used on a transient basis (within the meaning of section 7701(a)(19)(C)(v)), including all structures or other property appurtenant thereto. "(3) SPECIAL RULE FOR INDEBTEDNESS INCURRED BEFORE JULY i,
1982.—The term 'qualified housing interest' includes interest paid or accrued on indebtedness which— "(A) was incurred by the taxpayer before July 1, 1982, and "(B) is secured by property which, at the time such indebtedness was incurred, was— "(i) the principal residence (within the meaning of section 1034) of the taxpayer, or "(ii) a qualified dwelling used by the taxpayer (or any member of his family (within the meaning of section 267(c)(4))). "(f) ADJUSTMENTS FOR BOOK INCOME OF CORPORATIONS.—
"(1) IN GENERAL.—The alternative minimum taxable income of any corporation for any taxable year beginning in 1987, 1988, or 1989 shall be increased by 50 percent of the amount (if any) by which—
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