Second, system owners or investors with limited state tax burdens may not be able to take full advantage of the ITC. Thus, a tax credit may have little value to low- and moderate- income residents and others who have a small state-tax liability. While nearly all state tax- credit programs allow the unused portion of the credit to be carried over for five or 10 years, spreading the credit over time reduces its benefit. Third, ITCs reward the purchase and installation of technologies regardless of potential or actual energy production. Federal ITCs implemented in the 1970s and 1980s.
