Amends the Illinois Income Tax Act. Provides that all the corporations, wherever incorporated or domiciled, that are members of a unitary business shall file a combined return as a combined group. Makes changes to the definition of "unitary business". Contains provisions concerning a water's edge election. Provides that, with respect to unitary business groups, "United States" means the 50 states of the United States, the District of Columbia, and United States' territories and possessions.

Statutes affected:
Introduced: 35 ILCS 5/304, 35 ILCS 5/1501