Synopsis As Introduced Amends Historic Preservation Agency Act and the Illinois Income Tax Act. Requires the Historic Preservation Agency to authorize an income tax credit to taxpayers who incur eligible costs and expenses for rehabilitation of a certified historic structure or a structure in a certified historic district. Sets forth procedures and criteria for authorizing the credits. Provides that the aggregate amount of all credits that the Department may authorize in any calendar year may not exceed $40,000,000. Requires that 50% of the credits must be reserved for those rehabilitation projects incurring eligible costs and expenses of $1,000,000 or less and 25% must be reserved for those rehabilitation projects incurring eligible costs and expenses of $50,000 or less. Provides that the credit may be carried forward for 2 years. Exempts the credit from the Act's sunset provisions. Effective immediately.