Illinois has a flat income tax rate which applies to both single and joint filers. The Federal Income Tax, in contrast to the Illinois income tax, has multiple tax brackets with varied bracket width for single or joint filers.

• Single Tax Brackets
• Couples Tax Brackets

You can use the income tax estimator to the left to calculate your approximate Illinois and Federal income tax based on the most recent tax brackets.

Keep in mind that this estimator assumes all income is from wages, assumes the standard deduction, and does not account for tax credits.

For a more detailed estimate that takes these factors into account, click "View Detailed Estimate" (this will will redirect to an external website).

When calculating your Illinois income tax, keep in mind that the Illinois state income tax brackets are only applied to your adjusted gross income (AGI) after you have made any qualifying deductions.

Qualifying deductions might include an itemized deduction, the Illinois standard deduction, exemptions for dependants, business expenses, etc.

Remember that Illinois may have very different deduction laws from the Federal Income Tax, so you may have to write a whole new list of deductions for your Illinois income tax return.

	Download a .CSV file of the Illinois income tax brackets
	Download all 2013 state income tax tables as a PDF

1. The Illinois tax brackets on this page were last updated from the Illinois Department of Revenue in November, 2012. Please contact us if any of our Illinois tax data is incorrect or out of date.
2. Illinois tax return forms and the latest tax tables are available from the Department of Revenue .
3. Before the official 2013 Illinois income tax brackets are released, the brackets used on this page are an estimate based on the previous year's brackets. These numbers are subject to change if new Illinois tax tables are released.
4. The income tax estimator tool is provided by Tax-Rates.org.