72 Pa. Stat. § 8704-G
(a) Initial use.--Prior to sale or assignment of a tax credit under section 1706-G, a qualified taxpayer must first use a tax credit against the qualified tax liability incurred in the taxable year for which the tax credit was approved.
(b) Eligibility.--The credit may be applied against up to 20% of the qualified taxpayer ' s qualified tax liabilities incurred in the taxable year for which the credit was approved.
(c) Application.--The tax credit shall be applied against the qualified taxpayer's liability only after all other statutory tax credits and deductions available to the qualified taxpayer have been used.
(d) Limit.--A qualified taxpayer that has been granted a tax credit under this article shall be ineligible for any other tax credit provided under this act.
72 P.S. § 8704-G