Special rules

In the case of a husband or wife who files a separate return, the amount specified under subparagraph (B) of paragraph (1) shall be $12,500 in lieu of $25,000. This subparagraph shall not apply if the spouse of the taxpayer has no business credit carryforward or carryback to, and has no current year business credit for, the taxable year of such spouse which ends within or with the taxpayer’s taxable year.

In the case of a controlled group, the $25,000 amount specified under subparagraph (B) of paragraph (1) shall be reduced for each component member of such group by apportioning $25,000 among the component members of such group in such manner as the Secretary shall by regulations prescribe. For purposes of the preceding sentence, the term “controlled group” has the meaning given to such term by section 1563(a).

In the case of a person described in subparagraph (A) or (B) of section 46(e)(1) (as in effect on the day before the date of the enactment of the Revenue Reconciliation Act of 1990), the $25,000 amount specified under subparagraph (B) of paragraph (1) shall equal such person’s ratable share (as determined under section 46(e)(2) (as so in effect) of such amount.

In the case of a corporation—

(i) the first sentence of paragraph (1) shall be applied by substituting “25 percent of the taxpayer’s net income tax as exceeds $25,000” for “the greater of” and all that follows,

(ii) paragraph (2)(A) shall be applied without regard to clause (ii)(I) thereof, and

(iii) paragraph (4)(A) shall be applied without regard to clause (ii)(I) thereof.