(4) Claiming the Credit.

For purposes of determining the taxable year in which an energy credit may be claimed, a renewable energy source expenditure is treated as made on the date on which the expenditure qualifies as timely, or the date on which the expenditure is paid or incurred by the taxpayer, whichever is later. The amount of the energy credit claimed by the taxpayer in a taxable year may not exceed the taxpayer's personal income tax liability for that year. To determine the amount allowable in a given taxable year, a taxpayer must reduce the $1000 maximum credit amount by the amount of any energy credit allowed to the taxpayer in any prior taxable years with respect to the same principal residence. A taxpayer may carry-over any excess credit amount, as reduced from year to year, and apply it to his or her personal income tax liability for any one or more of the next succeeding three taxable years. REGULATORY HISTORY Emergency Regulation: 2/11/80 Promulgated: 5/15/80 New Regulation Promulgated: 2/5/99 Amended: 12/16/16 - Section (3)(a)