| (4) |
| (a) | For a residential energy system, other than a photovoltaic system, the tax credit described in this section is equal to the lesser of:
| (i) | 25% of the reasonable costs, including installation costs, of each residential energy system installed with respect to each residential unit the claimant, estate, or trust owns or uses; and |
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| (b) | Subject to Subsection (5)(d), for a residential energy system that is a photovoltaic system, the tax credit described in this section is equal to the lesser of:
| (i) | 25% of the reasonable costs, including installation costs, of each system installed with respect to each residential unit the claimant, estate, or trust owns or uses; or |
| (ii) |
| (A) | for a system installed on or after January 1, 2007, but on or before December 31, 2017, $2,000; |
| (B) | for a system installed on or after January 1, 2018, but on or before December 31, 2020, $1,600; |
| (C) | for a system installed on or after January 1, 2021, but on or before December 31, 2021, $1,200; |
| (D) | for a system installed on or after January 1, 2022, but on or before December 31, 2022, $800; |
| (E) | for a system installed on or after January 1, 2023, but on or before December 31, 2023, $400; and |
| (F) | for a system installed on or after January 1, 2024, $0. |
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| (c) |
| (i) | The office shall determine the amount of the tax credit that a claimant, estate, or trust may claim and list that amount on the written certification that the office issues under Subsection (5). |
| (ii) | The claimant, estate, or trust may claim the tax credit in the amount listed on the written certification that the office issues under Subsection (5). |
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| (d) | A claimant, estate, or trust may claim a tax credit under Subsection (3) for the taxable year in which the residential energy system is installed. |
| (e) | If the amount of a tax credit listed on the written certification exceeds a claimant's, estate's, or trust's tax liability under this chapter for a taxable year, the claimant, estate, or trust may carry forward the amount of the tax credit exceeding the liability for a period that does not exceed the next four taxable years. |
| (f) | A claimant, estate, or trust may claim a tax credit with respect to additional residential energy systems or parts of residential energy systems for a subsequent taxable year if the total amount of tax credit the claimant, estate, or trust claims does not exceed $2,000 per residential unit. |
| (g) |
| (i) | Subject to Subsections (4)(g)(ii) and (iii), a claimant, estate, or trust that leases a residential energy system installed on a residential unit may claim a tax credit under Subsection (3) if the claimant, estate, or trust confirms that the lessor irrevocably elects not to claim the tax credit. |
| (ii) | A claimant, estate, or trust described in Subsection (4)(g)(i) that leases a residential energy system may claim as a tax credit under Subsection (3) only the principal recovery portion of the lease payments. |
| (iii) | A claimant, estate, or trust described in Subsection (4)(g)(i) that leases a residential energy system may claim a tax credit under Subsection (3) for a period that does not exceed seven taxable years after the date the lease begins, as stated in the lease agreement. |
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| (h) | If a claimant, estate, or trust sells a residential unit to another person before the claimant, estate, or trust claims the tax credit under Subsection (3):
| (i) | the claimant, estate, or trust may assign the tax credit to the other person; and |
| (ii) |
| (A) | if the other person files a return under Chapter 7, Corporate Franchise and Income Taxes, the other person may claim the tax credit as if the other person had met the requirements of Section 59-7-614 to claim the tax credit; or |
| (B) | if the other person files a return under this chapter, the other person may claim the tax credit under this section as if the other person had met the requirements of this section to claim the tax credit. |
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