Definition and special rules relating to credit period

For purposes of this section, the term “credit period” means, with respect to any building, the period of 10 taxable years beginning with—

(A) the taxable year in which the building is placed in service, or

(B) at the election of the taxpayer, the succeeding taxable year,

but only if the building is a qualified low-income building as of the close of the 1st year of such period. The election under subparagraph (B), once made, shall be irrevocable.

(A) In general The credit allowable under subsection (a) with respect to any building for the 1st taxable year of the credit period shall be determined by substituting for the applicable fraction under subsection (c)(1) the fraction— (i) the numerator of which is the sum of the applicable fractions determined under subsection (c)(1) as of the close of each full month of such year during which such building was in service, and (ii) the denominator of which is 12.

(B) Disallowed 1st year credit allowed in 11th year Any reduction by reason of subparagraph (A) in the credit allowable (without regard to subparagraph (A)) for the 1st taxable year of the credit period shall be allowable under subsection (a) for the 1st taxable year following the credit period.

(A) In general In the case of any building which was a qualified low-income building as of the close of the 1st year of the credit period, if— (i) as of the close of any taxable year in the compliance period (after the 1st year of the credit period) the qualified basis of such building exceeds (ii) the qualified basis of such building as of the close of the 1st year of the credit period, the applicable percentage which shall apply under subsection (a) for the taxable year to such excess shall be the percentage equal to ⅔ of the applicable percentage which (after the application of subsection (h)) would but for this paragraph apply to such basis.

(B) 1st year computation applies A rule similar to the rule of paragraph (2)(A) shall apply to any increase in qualified basis to which subparagraph (A) applies for the 1st year of such increase.

(A) In general The credit period for an existing building shall not begin before the 1st taxable year of the credit period for rehabilitation expenditures with respect to the building.

(B) Acquisition credit allowed for certain buildings not allowed a rehabilitation credit (i) In general In the case of a building described in clause (ii)— (I) subsection (d)(2)(B)(iv) shall not apply, and (II) the credit period for such building shall not begin before the taxable year which would be the 1st taxable year of the credit period for rehabilitation expenditures with respect to the building under the modifications described in clause (ii)(II). (ii) Building described A building is described in this clause if— (I) a waiver is granted under subsection (d)(6)(B) with respect to the acquisition of the building, and (II) a credit would be allowed for rehabilitation expenditures with respect to such building if subsection (e)(3)(A)(ii)(I) did not apply and if the dollar amount in effect under subsection (e)(3)(A)(ii)(II) were two-thirds of such amount.