Tax and other officials permitted to inspect returns; reciprocal provisions

Notwithstanding the provisions of any law making it unlawful for any person, officer, or employee of the State to make known information imparted by any tax return or permit any tax return to be seen or examined by any person, it shall be lawful to: (1) Permit a duly accredited tax official of the United States, any state or territory, any county of this State, or the Multistate Tax Commission to inspect any tax return of any taxpayer; (2) Furnish to an official, commission, or the authorized representative thereof an abstract of the return or supply the official, commission, or the authorized representative thereof with information concerning any item contained in the return or disclosed by the report of any investigation of the return or of the subject matter of the return for tax purposes only; or (3) Provide tax return information to the auditor pursuant to section 23-5(a). The Multistate Tax Commission may make the information available to a duly accredited tax official of the United States, any state or territory, or the authorized representative thereof, for tax purposes only.