After application of subdivision (2) of this subsection, any unused credit is next applied to reduce the corporation net income tax imposed under §11-24-1 et seq. of this code (determined before application of any other allowable credits against tax). The amount of annual credit allowed will not reduce corporation net income tax, imposed under §11-24-1 et seq. of this code, below 50 percent of the amount which would be imposed for such taxable year in the absence of this credit against tax: Provided, That for tax years beginning on and after January 1, 2009, the amount of annual credit allowed will not reduce corporation net income tax, imposed under §11-24-1 et seq. of this code, below 40 percent of the amount which would be imposed for such taxable year in the absence of this credit against tax. When in any taxable year the taxpayer is entitled to claim credit under this article and §11-13D-1 et seq. of this code, the total amount of all credits allowable for the taxable year may not reduce the amount of the corporation net income tax, imposed under §11-24-1 et seq. of this code, below 50 percent of the amount which would be imposed for the taxable year (determined before application of any other allowable credits against tax): Provided, however, That when in any taxable year beginning on and after January 1, 2009, the taxpayer is entitled to claim credit under this article and §11-13D-1 et seq. of this code, the total amount of all credits allowable for the taxable year may not reduce the amount of the corporation net income tax, imposed under article §11-24-1 et seq. of this code, below 40 percent of the amount which would be imposed for the taxable year as determined before application of any other allowable credits against tax;
W. Va. Code § 11-13S-4