14 Ill. Adm. Code 528.100
Books and Records
Section 528.100 Books and Records
The applicant must at all times keep proper books of
record and accounts in accordance with generally accepted accounting
principles consistently applied, with the books, records, or papers related to
the accredited production in the custody or control of the taxpayer open for
reasonable Department inspection and audits, and including, without limitation,
the making of copies of the books, records, or papers, and the inspection or
appraisal of any of the assets of the applicant or the accredited production.
(Section
15(f) of the Act)