For taxable years ending before December 31, 2023, if the taxpayer is a partnership, a Subchapter S corporation, or a limited liability company that has elected partnership tax treatment, the credit shall be allowed to the partners, shareholders, or members in accordance with the determination of income and distributive share of income under Sections 702 and 704 and subchapter S of the Internal Revenue Code, as applicable. For taxable years ending on or after December 31, 2023, if the taxpayer is a partnership or a Subchapter S corporation, then the provisions of Section 251 apply. The Department, in cooperation with the Department of Commerce and Economic Opportunity, shall adopt rules to enforce and administer this Section. This Section is exempt from the provisions of Section 250 of this Act.
35 ILCS 5/229