Amends the Illinois Income Tax Act. Provides that, for tax years ending on or after December 31, 2024, the Department of Revenue shall print on each standard individual income tax return a single provision that authorizes the Department of Revenue to share the taxpayer's income information with local county assessment officials for the purpose of verifying the taxpayer's income information. Provides that, by April 1, 2025, the office of each chief county assessment officer must interface with the Department's tax system.