Illinois Income Tax Rate 2018 - 2019

Illinois state income tax rate table for the 2018 - 2019 filing season has one income tax bracket or a flat IL tax rate of 4.95% for Single, Married Filing Jointly, Married Filing Separately, and Head of Household statuses. The Illinois tax rate increased from 3.75% to 4.95% effective July 1, 2017.

Illinois income tax rate and tax brackets shown in the table below are based on income earned between January 1, 2018 through December 31, 2018. Outlook for the 2019 Illinois income tax rate is to remain unchanged at 4.95%.

Single Tax BracketsTax Rate 2018
Source: 2018 Illinois Tax Rate Schedule, published by the Illinois Department of Revenue.
$0to4.95%
Married Filing Jointly BracketsTax Rate 2018
Source: 2018 Illinois Tax Rate Schedule, published by the Illinois Department of Revenue.
$0to4.95%
Married Filing Separately BracketsTax Rate 2018
Source: 2018 Illinois Tax Rate Schedule, published by the Illinois Department of Revenue.
$0to4.95%
Head of Household BracketsTax Rate 2018
Source: 2018 Illinois Tax Rate Schedule, published by the Illinois Department of Revenue.
$0to4.95%

Please reference the Illinois tax forms and instructions booklet published by the Illinois Department of Revenue to determine if you owe state income tax or are due a state income tax refund. Illinois income tax forms are generally published at the end of each calendar year, which will include any last minute 2018 - 2019 legislative changes to the IL tax rate or tax brackets. The Illinois income tax rate tables and tax brackets shown on this web page are for illustration purposes only.

Illinois Tax Brackets 2018 - 2019

Looking at the tax rate and tax brackets shown in the tables above for Illinois, we can see that Illinois collects individual income taxes similarly for Single and Married filing statuses, for example. We can also see the flat nature of Illinois state income tax rates at 4.95% regardless of income and status.

For single taxpayers living and working in the state of Illinois:

  • Flat tax rate of 4.95% is applied to all taxable income.

For married taxpayers living and working in the state of Illinois:

  • Flat tax rate of 4.95% is applied to all taxable income.

For the Single, Married Filing Jointly, Married Filing Separately, and Head of Household filing statuses, the IL tax rates and the number of income tax brackets remain the same.

Last updated: October 8, 2018