Ala. Code § 41-9-219

The purchaser of the qualified equity investment, or subsequent holder of the qualified equity investment, earns a vested right to a tax credit and shall be entitled to utilize a portion of such tax credit during the taxable year including that credit allowance date equal to the applicable percentage for such credit allowance date multiplied by the purchase price paid to the issuer of the qualified equity investment. The amount of the tax credit claimed shall not exceed the amount of the taxpayer’s state tax liability for the tax year for which the tax credit is claimed. The basis of any qualified equity investment shall be reduced by the amount of any credit determined under this section with respect to such investment.