805 ILCS 5/1.60

Effect of repeal of prior law on rights accrued or liabilities or penalties incurred. The repeal of a law by this Act shall not affect any right accrued or established, or any liability or penalty incurred, under the provisions of such law, prior to the repeal thereof, provided, that in computing and adjusting franchise tax and penalties past due from a corporation, domestic or foreign, such computation and adjustment shall be made on the basis prescribed by this Act.