2015 Illinois Income Tax Table
2015 - 2016
Tax Bracket (Single) Marginal Tax Rate
$0+ 5.00%
Tax Bracket (Married) Marginal Tax Rate
$0+ 5.00%

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.

Please note: Our Illinois tax brackets are currently from tax year 2014. Many states adjust their tax brackets yearly, and we will update the Illinois tax brackets for 2015 as soon as they become available.

If you would like to file your Illinois income tax return by mail, you can download 2015 Illinois tax forms here.

Your 2015 income tax return was due on April 15th, 2016. The IRS and Illinois will soon be accepting tax returns, so you can start your online tax return today for free with TurboTax.

For earnings over $0.00, you'll pay 5.00% plus $0.00
For earnings over $0.00, you'll pay 5.00% plus $0.00

Illinois Tax Estimator

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 Illinois Tax Data
Download the Illinois tax table for Excel or database applications Download a .CSV file of the Illinois income tax brackets
Download tax forms Download or print Illinois income tax forms
Where Our Tax Data Comes From
  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 Please contact us if any of our Illinois tax data is incorrect or out of date.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 are available on the Illinois tax forms page or the Illinois Department of Revenue.
  3. Before the official 2016 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.