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Understanding Personal Income Tax in Illinois

Filed under State Taxes. Fact checked on February 12, 2013.

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This article discusses personal income tax in Illinois.

Illinois imposes a 5 percent personal income tax on your federal adjusted gross income with modifications, regardless of filing status.

If you are operating your business as an S corporation, partnership, limited liability company or sole proprietorship, you may be subject to a 5 percent personal income tax on your business's income that is not taxed at the corporate level, but instead passes through to you.

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