To claim a tax credit under this chapter, a taxpayer must attach to that taxpayer's tax return a certificate issued pursuant to this chapter when the return is filed with the department of revenue. A tax credit may be claimed in the first year that a certificate is issued. Any tax credit in excess of the taxpayer's liability for the tax year may be credited to the tax liability for the following five years or until depleted, whichever is earlier. A tax credit shall not be carried back to a tax year prior to the tax year in which the taxpayer claims the tax credit. For more information on claiming tax credits, see department of revenue rule 701-4222. (15E,422).
Iowa Admin. Code r. 261-116.9