119 STAT. 1034
PUBLIC LAW 109–58—AUG. 8, 2005
‘‘(c) CARRYFORWARD OF UNUSED CREDIT.—If the credit allowable under subsection (a) exceeds the limitation imposed by section 26(a) for such taxable year reduced by the sum of the credits allowable under this subpart (other than this section), such excess shall be carried to the succeeding taxable year and added to the credit allowable under subsection (a) for such succeeding taxable year. ‘‘(d) DEFINITIONS.—For purposes of this section— ‘‘(1) QUALIFIED SOLAR WATER HEATING PROPERTY EXPENDITURE.—The term ‘qualified solar water heating property expenditure’ means an expenditure for property to heat water for use in a dwelling unit located in the United States and used as a residence by the taxpayer if at least half of the energy used by such property for such purpose is derived from the sun. ‘‘(2) QUALIFIED PHOTOVOLTAIC PROPERTY EXPENDITURE.— The term ‘qualified photovoltaic property expenditure’ means an expenditure for property which uses solar energy to generate electricity for use in a dwelling unit located in the United States and used as a residence by the taxpayer. ‘‘(3) QUALIFIED FUEL CELL PROPERTY EXPENDITURE.—The term ‘qualified fuel cell property expenditure’ means an expenditure for qualified fuel cell property (as defined in section 48(c)(1)) installed on or in connection with a dwelling unit located in the United States and used as a principal residence (within the meaning of section 121) by the taxpayer. ‘‘(e) SPECIAL RULES.—For purposes of this section— ‘‘(1) LABOR COSTS.—Expenditures for labor costs properly allocable to the onsite preparation, assembly, or original installation of the property described in subsection (d) and for piping or wiring to interconnect such property to the dwelling unit shall be taken into account for purposes of this section. ‘‘(2) SOLAR PANELS.—No expenditure relating to a solar panel or other property installed as a roof (or portion thereof) shall fail to be treated as property described in paragraph (1) or (2) of subsection (d) solely because it constitutes a structural component of the structure on which it is installed. ‘‘(3) SWIMMING POOLS, ETC., USED AS STORAGE MEDIUM.— Expenditures which are properly allocable to a swimming pool, hot tub, or any other energy storage medium which has a function other than the function of such storage shall not be taken into account for purposes of this section. ‘‘(4) DOLLAR AMOUNTS IN CASE OF JOINT OCCUPANCY.—In the case of any dwelling unit which is jointly occupied and used during any calendar year as a residence by two or more individuals the following rules shall apply: ‘‘(A) The amount of the credit allowable, under subsection (a) by reason of expenditures (as the case may be) made during such calendar year by any of such individuals with respect to such dwelling unit shall be determined by treating all of such individuals as 1 taxpayer whose taxable year is such calendar year. ‘‘(B) There shall be allowable, with respect to such expenditures to each of such individuals, a credit under subsection (a) for the taxable year in which such calendar year ends in an amount which bears the same ratio to
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