Sec. 5. As used in this chapter, "state tax liability" means a taxpayer's total tax liability incurred under:
(1) IC 6-3-1 through IC 6-3-7 (the adjusted gross income tax); and
(2) IC 6-5.5 (the financial institutions tax);
as computed after the application of all credits that under IC 6-3.1-1-2 are to be applied before the credit provided by this chapter.