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Illinois corporate income tax return

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The Illinois Department of Revenue has big plans this holiday season to bring different types of unitary businesses that use different apportionment formulas together under a single, combined Illinois corporate income tax return. Like many states, Illinois corporate income taxpayers are generally required to file a unitary combined corporate income tax return.  This combined reporting method aggregates in one tax return the income, deductions and apportionment factors generated by commonly owned corporations operating as a unitary group.