Team
finance

Illinois Tax Calculator

Illinois residents face a combination of federal, state, and payroll taxes that significantly impact take-home income. This calculator estimates your total tax liability across all three categories—federal income tax (progressive brackets), Illinois state income tax (flat 4.95% rate), and FICA withholding (Social Security and Medicare)—plus property tax if you own a home. Enter your filing status, income, and deductions to see your effective tax rate and period-by-period breakdown.

Last updated:

Creators Tibor Pál, PhD candidate Economics
2,851 people find this calculator helpful

Tax Components in Illinois

Illinois taxpayers navigate multiple layers of taxation. Federal income tax uses progressive brackets ranging from 10% to 37%, determined by filing status and taxable income after deductions. The state applies a uniform 4.95% flat rate to all residents regardless of income level—there is no graduated state tax structure. FICA taxes, withheld from every paycheck, consist of two components: 6.2% for Social Security (capped at $168,600 annually) and 1.45% for Medicare (no cap). Property owners in Illinois also owe county-based property tax calculated on assessed home value, which varies by location but averages 1.8% statewide, with some counties reaching 2.66%.

Before calculating tax liability, you must first determine your adjusted gross income (AGI). AGI starts with gross earnings and subtracts above-the-line deductions such as traditional retirement contributions, certain business expenses for the self-employed, and qualified education costs. This adjusted figure serves as the baseline for computing both federal and state income taxes. Illinois offers personal exemptions ranging from $2,375 (single filers) to $4,750 (married filing jointly), which further reduce your Illinois taxable income.

Calculating Retirement Contributions

When you contribute a portion of your salary to a pre-tax retirement account (such as a traditional 401(k) or IRA), that amount reduces your AGI and thus your taxable income for both federal and state purposes. The calculation is straightforward:

Retirement Contributions = Retirement Percentage × Gross Income

  • Retirement Percentage — The proportion of gross income directed to retirement accounts (e.g., 0.10 for 10%)
  • Gross Income — Your total earnings before any deductions

How to Use This Calculator

Start by selecting your filing status (single, married filing jointly, married filing separately, or head of household) and the calendar year. Enter your annual gross income and any pre-tax deductions such as health insurance premiums, HSA contributions, or retirement plan deferrals. If you itemize deductions rather than take the standard deduction, input that total; otherwise, the calculator applies the standard deduction automatically.

For property tax estimates, provide your county of residence and the assessed value of your home after any applicable exemptions. Illinois offers a General Homestead Exemption of $6,000 (or $10,000 in Cook County) on primary residences; deduct this before entering your home value.

The calculator processes your income through federal tax brackets, applies Illinois's flat 4.95% state rate, calculates FICA withholding, and computes property tax based on your county's effective rate. Results display your total annual liability, effective tax rate, and optional period-by-period breakdown (weekly, biweekly, monthly, or annual).

Key Considerations When Calculating Illinois Taxes

Several common situations can affect your final tax bill:

  1. Standard vs. Itemized Deductions — The standard deduction (typically $12,950 for single filers in 2022) often exceeds itemized deductions. Only itemize if your mortgage interest, charitable donations, and state taxes combined exceed the standard amount. Entering a value lower than the standard triggers the calculator to use the standard instead.
  2. Dependent Exemptions — Illinois personal exemptions ($2,375 to $4,750) apply per filer and per dependent. The calculator assumes one dependent for single filers and two for married couples; specify only additional dependents beyond this baseline.
  3. County Property Tax Variation — Illinois property tax rates fluctuate significantly by county, from under 1% in some rural areas to 2.66% in high-tax jurisdictions. Your effective property tax depends heavily on location. If you relocate within Illinois, recalculate your estimate with your new county's rate.
  4. FICA Withholding on High Incomes — While Social Security tax caps at $168,600, Medicare tax (1.45%) applies to all earnings with no ceiling. High earners may also face the Net Investment Income Tax (3.8%) on unearned income—this calculator does not include that component.

Property Tax in Illinois

Property tax in Illinois is levied by individual counties and calculated by multiplying your assessed property value by the county's effective tax rate. The state does not impose a statewide property tax; instead, rates are set locally and vary dramatically. The statewide average hovers around 1.8%, but this masks significant variation: some rural counties charge under 1%, while Cook County and other high-demand areas exceed 2.5%.

To estimate your obligation, obtain your assessed home value from the county assessor's office (many publish online records). Deduct any applicable exemptions—the General Homestead Exemption of $6,000 (or $10,000 in Cook County) for owner-occupied primary residences, plus any senior, disability, or veterans' exemptions you qualify for. Multiply the remaining assessed value by your county's effective rate. This calculator includes county-by-county rates and adjusts automatically when you select your county; you can also override the rate if you have reason to believe yours differs from the average.

Frequently Asked Questions

Does Illinois impose a local income tax?

No. Illinois residents pay only federal income tax, state income tax, and FICA (Social Security and Medicare). There is no local income tax in any Illinois municipality. The state's income tax is flat at 4.95% for all residents regardless of income. Federal tax uses progressive brackets from 10% to 37% based on filing status and taxable income. FICA comprises 6.2% Social Security tax and 1.45% Medicare tax, both withheld from paychecks.

What is Illinois's state income tax rate?

Illinois applies a flat state income tax of 4.95% to all taxpayers—single, married, and all income levels are taxed at the same percentage. This uniform rate means a household earning $30,000 pays the same rate as one earning $300,000. However, personal exemptions ($2,375 for single filers, $4,750 for married filing jointly) reduce the income subject to this tax. For example, a single filer with $40,000 AGI subtracts the $2,375 exemption, leaving $37,625 taxable at 4.95%, yielding $1,862 in state income tax.

How much total tax would a married couple filing jointly owe on $75,000 income in Illinois?

Assuming married filing jointly status with standard deductions and no additional dependents or special credits: Your federal income tax would be approximately $5,481 after subtracting the standard deduction of $25,900, leaving $49,100 at a marginal rate of 12%. FICA withholding is $5,738 (7.65% of gross). Illinois state income tax is $3,477 after subtracting the $4,750 married exemption and applying the 4.95% rate. Total tax liability is roughly $14,696, yielding an effective tax rate of about 19.6%. Property tax depends on your county and home value.

How are Illinois property taxes calculated?

Property tax equals your assessed home value multiplied by your county's effective tax rate. First, obtain your assessed value from your county assessor—most publish these online. Subtract eligible exemptions: the General Homestead Exemption of $6,000 (Cook County offers $10,000), plus any senior, veteran, or disability exemptions you qualify for. Then multiply the remaining value by your county's rate. Example: a home assessed at $200,000 in a county with a 1.8% rate yields $3,600 annual property tax. Rates vary from under 1% in some rural counties to 2.66% in high-tax counties like Kane.

What deductions reduce my Illinois taxable income?

Illinois state taxable income starts with your federal AGI after above-the-line deductions (retirement contributions, business expenses for self-employed, certain education costs). You then apply either the standard deduction or itemized deductions, whichever is larger. Finally, subtract your personal exemption ($2,375 single, $4,750 married) to arrive at Illinois taxable income. Federal deductions for mortgage interest, charitable gifts, and state and local taxes do not directly reduce Illinois state tax, but they lower your federal AGI, which in turn reduces the Illinois tax base.

Can I claim a homestead exemption on my Illinois home?

Yes. Most Illinois homeowners qualify for the General Homestead Exemption on their primary residence: $6,000 in most counties, or $10,000 in Cook County. This exemption reduces your assessed home value before calculating property tax. For example, a home assessed at $200,000 with the standard $6,000 exemption becomes $194,000 for tax purposes. Additional exemptions may apply if you are age 65 or older, disabled, a surviving spouse, a disabled veteran, or meet other criteria. Apply through your county assessor; eligibility and application deadlines vary by county.

More finance calculators (see all)

Free Cash Flow to Equity Calculator VA Disability Calculator Accrual Ratio Calculator Net Promoter Score Calculator New Jersey Sales Tax Calculator Graham Number Calculator Prorated Salary Calculator Tax Bracket Calculator