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Illinois Corporate Income Taxes (Subscribe)
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Illinois state income tax on corporations, including state income and franchise tax nexus and doing business in Illinois, allocation and apportionment, business and nonbusiness income, consolidated and combined returns, and other Illinois corporate income tax information.
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The Illinois General Assembly, composed of a 59-member Senate and a 118-member House of Representatives, is responsible for enacting, amending, or repealing laws, passing resolutions, adopting appropriation bills and conducting inquiries on proposed legislation.
