Replaces everything after the enacting clause. Amends the Retailers' Occupation Tax Act. Provides that certain financial information that may be disclosed to a municipality may also be disclosed to a county. Provides that, in addition to other information that may be disclosed to municipalities and counties by the Department of Revenue, the Department may disclose the standard classification number assigned to a business. Requires the municipality or county to enter into a written information sharing agreement with the Department prior to receiving the information. Provides that only the chief executive officer of the municipality or county may initiate such an agreement. Contains provisions concerning third parties that may request, view, or receive confidential information.