However, if a Notice of Tax Liability has been issued, and if the questions raised thereby have not been completely disposed of, books and records reflecting receipts received during the period covered by such Notice of Tax Liability must be preserved until the termination of all proceedings before the Department and before any court upon review.
Ill. Admin. Code tit. 86, § 130.820
Amended at 5 Ill. Reg. 12782, effective November 2, 1981