Illinois Tax Calculator: Estimate Illinois Tax

An Illinois Tax Calculator can help you work out how much Illinois income tax you will pay. Whether you live in Chicago, Springfield, Aurora, Naperville or somewhere else in Illinois, this calculator can give you an idea of how much income tax you may pay.

Illinois uses a flat tax system to calculate your individual income tax liability. This means that you\'ll generally pay the same amount of income tax based on your taxable income. Unlike other states, there are no progressive tax brackets. You\'ll not pay an increased amount of individual income tax based on your income. However, there may be exemptions, credits, circumstances and other factors that will affect your tax liability.

The Illinois Tax Calculator can be used by employees, freelancers, self employed or anyone wanting to get a rough idea of your state income tax. This calculator can be used when budgeting your yearly income, working out your take home pay, preparing for tax time or comparing salaries.

Note: This is separate from your federal income tax, social security and Medicare. There may also be local taxes applicable.

How To Use The Illinois Tax Calculator

The Illinois Tax Calculator can be used by simply adding in the required information.

• Add in your income
• Add in the tax year.
• Add in exemptions/adjustments
• Add in any extra information.
• Click calculate.
• Review your results.

Ensure you know what type of income you\'re adding in. You may need to add in your gross income, your federal adjusted gross income, Illinois base income or Illinois taxable income. This may vary.

If you just need a rough figure, you can add your taxable income and multiply by the applicable Illinois income tax rate. However, if you want a more accurate figure, add in the applicable figures from your tax documents.

Illinois Tax Calculator Formula

Illinois generally uses a flat 4.95% tax rate on individual income. The basic formula is:

Illinois State Income Tax = Illinois Taxable Income x 4.95%.

If your Illinois taxable income was $60,000 then:

Illinois State Income Tax = $60,000 x 0.0495

= $2,970.

This is a very basic calculation and does not account for any exemptions, credits or payments.

When completing your individual income tax return, there may be additional calculations. Illinois has its own tax rules which will calculate your taxable income. Taxpayers who are eligible can also claim applicable exemptions and credits. Therefore applying the 4.95% tax rate directly to your gross salary may not accurately reflect your tax liability.

Example

You are a single taxpayer living in Illinois. You have an income of $60,000 in annual income during the 2026 tax year. For illustration, assume the entire $. The $60,000 is your Illinois income. You are entitled to a personal exemption of $2,925.

Below is an example of a simplified calculation using the 2026 exemption and 4.95% tax rate.

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Calculation

Income $60,000

Personal exemption (assumed) $2,925

Taxable income $57,075

Illinois tax rate 4.95%

State income tax $2,825.21

Calculations:

$57,075 × 0.0495 = $2,825.21

Based on the simple assumptions above, your estimated Illinois state income tax is $2,825.21.

This is just an example. When calculating your Illinois tax you will need to follow the rules for income and exemptions. The income being taxed may vary.

Understanding Your Results

The Illinois Tax Calculator may show you your estimated state income tax, effective tax rate or estimated income after state income tax has been paid.

Estimated state income tax – This is an approximate figure of how much you would pay to Illinois. This does not account for any credits, payments or adjustments.

Effective tax rate – This is the percentage of the income you\'ve selected that will be paid as state tax. This may vary from the tax rate if you are claiming exemptions or adjustments.

Income after state income tax – This is how much income you have left after paying your estimated state income tax. This is not necessarily your take home pay as you may also pay federal income tax, payroll tax, insurance, pension and other deductions.

Estimated tax payable – This may indicate how much tax you have to pay based on your estimated tax. This may vary depending on your circumstances.

Your employer will be deducting Illinois income tax from your pay as an advance payment. The amount being deducted may not be exactly the same as your tax liability.

Things To Consider

There are a few things to consider when calculating how much Illinois income tax you may pay.

Income

Your income will be the main factor in deciding how much tax you will pay. The higher your taxable income, the higher the amount of tax you\'ll pay as Illinois uses a flat tax system.

Personal exemptions

Eligible taxpayers may be entitled to a personal exemption. For the 2026 tax year, the standard personal exemption is $2,925 for each eligible exemption. You must meet the eligibility criteria set by Illinois.

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Circumstances

Your circumstances may affect your tax. This can include your filing status, dependents and whether you are eligible for exemptions or credits.

Adjustments

You may have some additions and deductions to your income based on Illinois tax law. This can mean your Illinois income differs from the income on your federal return.

Credits

Eligible taxpayers may be entitled to some credits. These can include the Illinois Earned Income Tax Credit.

Residency

If you\'re a resident, part year resident or non-resident with income from Illinois, you may have different requirements.

Tax year

The tax rates, exemptions, credits and other tax considerations may vary. Ensure you select the correct tax year.

Benefits

An Illinois Tax Calculator can help you make informed decisions about your finances.

Budgeting – You can get an idea of how much you\'ll pay in state income tax throughout the year and set aside money.

Pay – You can get an idea of how much state income tax will affect your income.

Freelance – You can get an idea of how much state tax you may pay. If applicable, you can prepare for estimated payments.

Comparing jobs – You can compare salaries and get an idea of how much state income tax you may pay.

Preparing tax – You can get an initial idea of how much tax you may pay.

Planning – You can use the estimated tax amount when planning your savings, investments, housing costs or other financial goals.

Remember that if you\'re self employed you may also have to pay federal income tax and self employment tax.

Accuracy

The Illinois Tax Calculator will give you an indication of how much tax you may pay based on the information you\'ve added. The accuracy will depend on selecting the correct tax year, income, exemptions and other applicable information.

A basic calculator multiplying your income by 4.95% will give you a quick idea but may not take into consideration all the different tax considerations. You should not assume your gross wages are taxable in Illinois and only add in exemptions if they are allowed.

Not all credits, special adjustments, part year residency requirements and non-resident allocations may be included. This calculator will not calculate your full federal tax liability or all your payroll deductions.

For official information visit the Illinois Department of Revenue website and check the instructions for the relevant year on Form IL-1040.

This calculator can be used for general planning purposes.

Frequently Asked Questions

What is the Illinois state income tax rate?

Illinois uses a flat 4.95% tax rate for individual income tax. This will be applied to your taxable income. However, there may be exemptions, credits and adjustments to your income which will affect your tax liability.

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Are there different tax brackets in Illinois?

No, Illinois generally uses a flat tax rate for individual income tax. This means you\'ll pay the same tax rate. However, your tax will depend on your taxable income and adjustments.

How do I calculate my Illinois income tax on a $50,000 salary?

To get a rough idea you can multiply $50,000 by 4.95%, which equals $. This assumes you\'re paying tax on the whole amount. Your actual tax may vary depending on your exemptions, adjustments and credits.

What is the personal exemption for 2026 in Illinois?

The standard personal exemption for 2026 is $2,925. There are some eligibility requirements. You must meet certain criteria regarding your federal adjusted gross income and dependents. Check the official instructions when calculating your tax.

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Does the Illinois Tax Calculator include federal income tax?

Not necessarily. This calculator will generally just give you an idea of how much state income tax you\'ll pay. You will need to calculate your federal income tax, social security, medicare and other payroll deductions separately.

Do Illinois residents pay state income tax on all their income?

Generally, Illinois residents will report their income according to Illinois\' resident tax rules. Part year residents and non-residents may have different requirements. This can include income earned outside of Illinois.

Can I use the Illinois Tax Calculator for tax planning?

Yes. This calculator can give you an idea of how much state income tax you\'ll pay. You can use this to budget, compare salaries and prepare for tax time. When making decisions regarding your tax, ensure you check the current instructions from the Illinois Department of Revenue. If needed, contact a qualified tax professional.