Illinois Income Tax Table 2015 Illinois Income Tax Brackets

Illinois - Single Tax Brackets
Tax Bracket Tax Rate
$0.00+ 3.75%
Illinois - Married Filing Jointly Tax Brackets
Tax Bracket Tax Rate
$0.00+ 3.75%

Illinois has a flat income tax of 3.75% — All earnings are taxed at the same rate, regardless of total income level

Illinois' income tax rates were last changed two years ago for tax year 2013, and the tax brackets have not been changed since at least 2001.

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.

How do Illinois tax brackets work?

Technically, you don't have just one "tax bracket" - you pay all of the Illinois marginal tax rates from the lowest tax bracket to the tax bracket in which you earned your last dollar. For comparison purposes, however, your Illinois tax bracket is the tax bracket in which your last earned dollar in any given tax period falls.

You can think of the bracketed income tax as a flat amount for all of the money you earned up to your highest tax bracket, plus a marginal percentage of any amount you earned over that. The chart below breaks down the Illinois tax brackets using this model:

For earnings over $0.00, you'll pay 3.75% plus $0.00
For earnings over $0.00, you'll pay 3.75% plus $0.00

Illinois Income Tax Calculator Illinois Income Tax Calculator


Illinois Income 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).

Illinois Tax Deductions

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 the Illinois tax table for Excel or database applications

Download .CSV file of IL income tax brackets

Download tax forms

Download or print Illinois income tax forms

Illinois Standard Deductions & Personal Exemption Amounts


In addition to marginal tax brackets, one of the major features of the Illinois income tax is deductions. The three most common deductions encountered by taxpayers are the Illinois Standard Deduction, the Illinois Personal Exemption, and the Illinois Dependent Deduction. The current values of these deductions for tax year 2015 are as follows:

Standard Deduction (Single) Standard Deduction (MFJ) Personal Exemption Dependant Exemption
$0.00 $0.00 $2,125.00 $4,250.00

The standard deduction, which Illinois does not have, is a deduction that is available by default to all taxpayers who do not instead choose to file an itemized deduction.

The Personal Exemption, which is supported by the Illinois income tax, is an additional deduction you can take if you (and not someone else) are primarily responsible for your own living expenses. Likewise, you can take an additional dependent exemption for each qualifying dependent (like a child or family member), who you financially support.

The Federal income tax also has a standard deduction, personal exemptions, and dependant deductions, though they are different amounts than Illinois' and may have different rules.

Head over to the Federal income tax brackets page to learn about the Federal Income Tax, which applies in all states nationwide.

Illinois Income Tax Rate 2015 Sources & Citations

Disclaimer: While we do our best to keep this list of Illinois income tax rates up to date and complete, we cannot be held liable for errors or omissions. Is info on this page missing or out-of-date? Please let us know so we can fix it!

These IL income tax rates are updated for 2015 / 2016 The Illinois tax brackets on this page have been updated for tax year 2015, and are the latest brackets available. States often adjust their tax brackets on a yearly basis, so make sure to check back later for Illinois' updated tax year 2016 tax brackets!


Tax Data Sources:

  1. The Illinois tax brackets on this page were last updated from the Illinois Department of Revenue in 2015. 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 Illinois income tax estimator tool is provided by Tax-Rates.org .

** This Document Provided By Tax-Brackets.org **
Source: http://www.tax-brackets.org/illinoistaxtable