Yes, Illinois Does Have State Income Tax—Here's What You Need to Know

If you’re earning income in Illinois or live in the state, you likely have tax obligations. The straightforward answer is yes—Illinois does impose a state income tax on residents and those earning income within its borders. Understanding how this tax system works can help you plan your finances better and avoid surprises at tax time.

How Much is Illinois State Income Tax?

Illinois operates with a single, flat income tax rate that applies uniformly to all individual income levels. The state income tax rate stands at 4.95% for all residents and income earners. This flat-rate structure means that whether you earn $30,000 or $300,000 annually, the same percentage applies to your taxable income—there are no progressive brackets that increase the rate at higher income levels. Additionally, Illinois maintains a sales tax system with two tiers: qualifying food, drugs, and medical devices are taxed at 1%, while general merchandise and items requiring registration are taxed at 6.25%. Counties can layer on their own additional sales tax rates as well.

Personal Exemptions and Deductions

One key feature of Illinois’s tax system is that the state does not follow the federal model of standard or itemized deductions. Instead, Illinois offers a personal exemption approach. For the current tax year, Illinois residents can claim a personal exemption of $2,375. If you’re married and filing jointly with a spouse who is over 65 or legally blind, you’re entitled to an additional $1,000 exemption. This exemption serves as a form of deduction that reduces your taxable income before the flat tax rate is applied.

Tax Credits That Can Help You

Illinois provides several tax credits beyond just exemptions, which can directly reduce the amount of tax you owe. These credits can be particularly valuable because they lower your tax liability dollar-for-dollar. The Earned Income Tax Credit (EITC) is available to working individuals with low to moderate income levels. This credit is refundable, meaning you could potentially receive a refund even if you owe no taxes. To qualify, you must also qualify for the federal EITC, and Illinois’s credit is valued at 18% of your federal credit amount.

Parents and guardians can also access the Education Expense Credit if they have children attending K-12 schools in Illinois. Qualified education expenses exceeding $250 per child can be claimed, though income limits apply (those with AGI over $500,000 for joint filers or $250,000 for others cannot claim this credit). The Invest in Kids Credit rewards contributions to scholarship-granting organizations with a tax credit equal to 75% of the contribution amount, up to $1 million per year. Finally, homeowners can claim a Property Tax Credit by taking a credit equal to 5% of real estate taxes paid on their primary residence, provided their income falls below the thresholds mentioned above.

Sales Tax in Illinois

Beyond state income tax, Illinois residents also encounter sales taxes on purchases. The state’s sales tax structure is straightforward: essential items like food and prescription drugs are taxed at 1%, while most other retail purchases are taxed at 6.25%. It’s important to note that local counties throughout Illinois can implement additional sales tax on top of the state rate, so the total sales tax you pay depends partly on where you live. The Illinois Tax Rate Finder tool can help you determine your local combined rate.

Property Tax and Other Levies

Illinois residents also pay property taxes on real estate holdings. The state offers a homestead exemption to owner-occupants of residential properties—up to $10,000 in Cook County and $6,000 in all other counties. Special exemptions also apply to individuals with disabilities and military veterans. Additionally, capital gains are taxed at your regular income tax rate in Illinois, and trusts or estates pay the same 4.95% income tax rate that applies to individuals, though trusts also pay a separate replacement tax of 1.5%.

Who Must File Taxes in Illinois?

Several categories of people are required to file an Illinois income tax return. Full-year residents—those who lived in Illinois for the entire year—must file if they meet income thresholds. Part-year residents who either moved to Illinois during the year or left Illinois to become residents of another state must also file. Nonresidents who earned enough income from Illinois sources to have a tax liability are obligated to file an Illinois return even if they don’t live in the state. The key determining factor is whether you received income from an Illinois source and whether that income generated a tax liability.

Understanding Illinois’s tax structure—from the flat 4.95% state income tax rate to the available credits and exemptions—is essential for proper tax planning. Whether you’re a longtime resident or new to the state, staying informed about your obligations can help ensure you take full advantage of available deductions and credits while remaining in compliance with state law.