Special rules
(A) Tax benefit rule The tax for the taxable year shall be increased under paragraph (1) only with respect to credits allowed by reason of this section which were used to reduce tax liability. In the case of credits not so used to reduce tax liability, the carryforwards and carrybacks under section 39 shall be appropriately adjusted.
(B) Only basis for which credit allowed taken into account Qualified basis shall be taken into account under paragraph (1)(B) only to the extent such basis was taken into account in determining the credit under subsection (a) for the preceding taxable year referred to in such paragraph.
(C) No recapture of additional credit allowable by reason of subsection (f)(3) Paragraph (1) shall apply to a decrease in qualified basis only to the extent such decrease exceeds the amount of qualified basis with respect to which a credit was allowable for the taxable year referred to in paragraph (1)(B) by reason of subsection (f)(3).
(D) No credits against tax Any increase in tax under this subsection shall not be treated as a tax imposed by this chapter for purposes of determining the amount of any credit under this chapter.
(E) No recapture by reason of casualty loss The increase in tax under this subsection shall not apply to a reduction in qualified basis by reason of a casualty loss to the extent such loss is restored by reconstruction or replacement within a reasonable period established by the Secretary.
(F) No recapture where de minimis changes in floor space The Secretary may provide that the increase in tax under this subsection shall not apply with respect to any building if— (i) such increase results from a de minimis change in the floor space fraction under subsection (c)(1), and (ii) the building is a qualified low-income building after such change.