(a) General rule.--If a qualified taxpayer does not use all or any portion of a tax credit for the taxable year in which the tax credit is first approved, then the excess may be carried over to succeeding taxable years and used as a credit against the qualified tax liability of the qualified taxpayer for those taxable years. Each time the tax credit is carried over to a succeeding taxable year, it shall be reduced by the amount that was used as a credit during the immediately preceding taxable year. The tax credit provided by this article may be carried over and applied to succeeding taxable years for no more than 15 taxable years following the first taxable year for which the taxpayer was entitled to claim the credit.

(b) No carryback or refund.--A qualified taxpayer is not entitled to carry back or obtain a refund of all or any portion of an unused tax credit granted to the qualified taxpayer under this article.