Illinois Income Tax Rate For 2023

Illinois has one individual income tax bracket with a flat rate of 4.95%. Below you will find 2023 Illinois tax brackets and tax rates for all four IL filing statuses. The Illinois tax rate and tax brackets tabulated below are based on income earned between January 1, 2023 through December 31, 2023. Individual taxpayers will submit both their federal tax forms and state tax forms by April 15, 2024.

The Illinois income tax rate increased from 3.75% to 4.95% effective July 1, 2017. The mid-year effective date resulted in a blended rate on income earned during the 2017 calendar year. The 2023 Illinois tax rate remains unchanged from last year at 4.95%. Outlook for the 2024 Illinois tax rate is to remain unchanged at 4.95%.

Illinois Income Tax Calculation For $70,000 In Wages

• Tax Year: 2023
• Filing Status: Single
• Illinois Tax Rate: 4.95%
• Illinois Personal Exemption: $2,425
• Illinois Income Tax Estimate: $3,345
• Illinois Effective Tax Rate: 4.78%

To simplify and standardize the calculation across states, we assume the taxpayer has only income from Wages, salaries, tips, etc Line 1 on federal Form 1040. Illinois Form IL-1040 begins with federal adjusted gross income, 1040 Line 11. That means we must subtract the personal exemption amount of $2,425 from our 2023 wages. The result is our Illinois taxable income, which we can then multiply by the 2023 Illinois tax rate of 4.95%.

Illinois Income Tax = ( $70,000 - $2,425 ) × 4.95% = $3,345

To calculate the effective income tax rate for the state of Illinois, we simply divide the previously calculated income tax estimate by our initial $70,000 in wages.

Illinois Effective Tax Rate = $3,345 ÷ $70,000 = 4.78%

The actual amount of income tax you will pay in the state of Illinois will vary. Illinois, as with other states, often allow taxpayers to make additions and subtractions to their federal taxable income. Many states also offer credits for families with children, charitable contributions, and environmental initiatives, for example.

Illinois 2023 Income Tax Brackets by Filing Status

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 tax forms are generally published at the end of each calendar year, which will include any last minute 2023 - 2024 legislative changes to the IL tax rate or tax brackets. The Illinois tax brackets and tax rates calculated on this web page are to be used for illustration purposes only.

Frequently Asked Questions

Which Illinois tax bracket am I in?

In the state of Illinois there is just one personal income tax bracket. Every individual taxpayer is therefore in the same bracket regardless of filing status and amount.

What is the Illinois income tax rate for 2023?

Illinois's 2023 income tax rate is 4.95%.

What is Illinois's marginal tax rate?

The current flat tax rate for Illinois is 4.95%. The Illinois marginal tax rate used in our example calculation above on this page is 4.95%. That is the tax rate applied to each additional dollar of taxable income you earn. Since Illinois is a flat tax rate state, the nominal or official tax rate equals the marginal tax rate.

What is Illinois's effective tax rate?

Illinois's effective tax rate is 4.78%. Effective tax rate equals the total tax paid divided by total taxable income. Find our Illinois tax rate calculations above on this page for more information.

How much state income tax will I pay in Illinois?

The national average adjusted gross income (AGI) reported by the IRS each year is about $70,000. A single Illinois taxpayer with $70,000 in wages would pay approximately $3,345 to the Illinois Department of Revenue. Find our Illinois tax rate calculations above on this page for more information.

Does Illinois have a standard deduction?

No. Illinois does not have a standard deduction for 2023.

Does Illinois have a personal exemption?

Yes. Illinois does have a personal exemption of $2,425 for a single person and $4,850 for a married couple.

Does Illinois have a dependent exemption?

Yes. Illinois does have a dependent exemption of $2,425 per dependent for 2023.

Is Illinois a flat tax state?

Yes. Illinois's state income tax rate is a flat 4.95% of your taxable income. Regardless of your income level, you will pay the same rate. There are nine flat tax rate states in the United States: Colorado, Illinois, Indiana, Kentucky, Massachusetts, Michigan, North Carolina, Pennsylvania, and Utah

Last updated: November 2, 2023

Income Tax Rates