of any taxpayer making or who may be required to make returns, with the state tax commission or may furnish to such officer or his authorized representative an abstract or copy of any tax return or tax information or any information disclosed by the report of any audit or investigation relating to any taxpayer; but such permission shall be granted or information furnished to such officer or his representatives only if the statutes of the United States or such other state, as the case may be, grant substantially similar privileges to the state tax commission.
Idaho Code § 63-3077