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Illinois Corporate Income Tax refers to the taxation of corporate profits within the state of Illinois, encompassing both the state income tax and the personal property replacement tax (PPRT). It involves understanding and applying the Illinois Income Tax Act (IITA) regulations to ensure compliance for corporations operating in the state.
Illinois imposes a two-tiered corporate income tax structure: a standard corporate income tax rate of 7% and an additional Personal Property Replacement Tax (PPRT) rate of 2.5% on corporate income. This results in a combined corporate income tax rate of 9.5%. Corporations are required to file Form IL-1120 annually with the Illinois Department of Revenue (IDOR) and make estimated tax payments throughout the year. The state adheres to federal taxable income as a starting point, with various state-specific additions, subtractions, and apportionment rules.