Illinois has three main taxes that affect your household: income tax, sales tax, and property tax

Illinois charges a flat income tax of 4.95% on wages, retirement income, and most other earnings. This is the same rate for everyone, regardless of how much you earn. The state also charges sales tax, which varies by location but ranges from 6.25% to 10.25% depending on your county and municipality. Property tax is assessed on real estate you own and is calculated by your local county assessor based on the property's value.

Each tax works differently and affects different parts of your finances. Income tax is withheld from paychecks by your employer. Sales tax is added at checkout when you buy goods and some services. Property tax is billed annually or semi-annually by your county, usually through an escrow account if you have a mortgage.

Key Takeaways

  • Illinois income tax is a flat 4.95% on wages and most other income, withheld automatically by your employer.
  • Sales tax in Illinois ranges from 6.25% to 10.25% depending on your county and what you buy, with groceries and prescription drugs exempt.
  • Property tax is assessed by your county assessor and billed annually or twice yearly, based on your home's assessed value.
  • You can deduct Illinois income tax and property tax on your federal return if you itemize deductions instead of taking the standard deduction.

How Illinois income tax is calculated and withheld

Your employer withholds 4.95% of your gross pay for Illinois income tax. This happens automatically with each paycheck, the same way federal income tax is withheld. The amount is sent to the Illinois Department of Revenue on your behalf.

When you file your state tax return each year (due April 15, the same day as your federal return), you report all income earned in Illinois and calculate what you actually owe. If your employer withheld too much, you receive a refund. If too little was withheld, you owe the difference. Self-employed people and those with income not subject to withholding must make estimated tax payments four times a year.

Certain types of income are exempt from Illinois income tax. These include Social Security benefits, some retirement income from out-of-state pensions, and income from U.S. Treasury bonds. If you receive these forms of income, you may not owe state tax even if you have other earnings.

Sales tax rates and what is taxed in your area

Illinois's base sales tax rate is 6.25%, but your actual rate depends on your county and municipality. Cook County (which includes Chicago) charges 6.25% at the state level, but many municipalities add local taxes, bringing the total to 8.25% or higher. Downstate counties may have lower combined rates. You can find your exact rate by entering your address on the Illinois Department of Revenue website.

Groceries and prescription drugs are not taxed in Illinois. Restaurant meals, prepared foods, and over-the-counter medicines are taxed. Clothing is taxed, though some states exempt it—Illinois does not. Services like haircuts, repairs, and professional fees are generally not taxed, but there are exceptions for things like telecommunications and hotel stays.

Online purchases are subject to Illinois sales tax if the seller has a physical presence in the state or meets federal economic nexus thresholds. Most large retailers now collect and remit this tax automatically.

Property tax: how it is assessed and billed

Property tax in Illinois is based on the assessed value of your home, set by your county assessor. The assessor estimates what your property would sell for on the open market, then applies a statewide assessment level (usually 33.33% of that value) to arrive at the assessed value. Your tax bill is then calculated by multiplying the assessed value by the local tax rate, which varies widely by county and school district.

Property tax bills are sent by your county treasurer, usually twice a year (in spring and fall), though some counties bill annually. If you have a mortgage, your lender likely collects property tax through an escrow account and pays the bill on your behalf. If you own your home outright, you pay the county directly.

Property tax rates in Illinois vary dramatically. Some areas pay under 0.5% of assessed value annually, while others pay over 2%. Cook County and collar counties tend to have higher rates than downstate rural areas. You can find your specific rate by contacting your county assessor's office.

Deductions and credits available to Illinois residents

On your federal tax return, you can deduct Illinois income tax and property tax if you itemize deductions instead of taking the standard deduction. However, the federal cap on state and local tax (SALT) deductions is $10,000 per year, so if your combined state income tax and property tax exceed that, you cannot deduct the full amount.

Illinois also offers a Homeowner Property Tax Relief Credit for homeowners with lower incomes. This credit reduces your property tax bill if your income falls below certain thresholds and your property tax burden is high relative to your income. You must file a separate form with your state return to claim it.

Renters do not pay property tax directly, but Illinois offers a Renter's Deduction on the state return. This allows renters to deduct a portion of rent paid, treating it as an indirect property tax expense. The deduction is modest but available to all renters regardless of income.

Tax filing important date and where to file in Illinois

Illinois state income tax returns are due April 15 each year, the same important date as federal returns. If you need more time, you can file for an automatic extension, which gives you until October 15. However, an extension to file is not an extension to pay—taxes owed are still due April 15, or you will owe penalties and interest.

You file your Illinois return using Form IL-1040 (the state equivalent of the federal 1040). You can file online through the Illinois Department of Revenue website, by mail, or through a tax preparer. If you use tax software like TurboTax or H&R Block, the state return is usually included in the package.

Property tax bills do not require a return—you straightforward pay the bill sent by your county treasurer by the due date listed. Sales tax is collected at the point of sale and remitted by the retailer, so you do not file a separate return for it unless you are a business owner.

Common tax situations and how they affect your bill

If you work in Illinois but live in another state, you owe Illinois income tax on wages earned in the state. However, you may also owe tax to your home state, depending on its laws. Some states have reciprocal agreements that prevent double taxation, but Illinois does not have many of these agreements. You may be able to claim a credit on your home state return for taxes paid to Illinois.

If you are retired and receive a pension from an Illinois public employee system (teachers, police, firefighters), that income is exempt from Illinois income tax. Pensions from private employers or out-of-state public systems are also exempt. However, if you have other income like wages or investment gains, those are still taxed at 4.95%.

If you own rental property in Illinois, you must report rental income on your state return and pay income tax on the net profit. You can deduct mortgage interest, property tax, repairs, and other legitimate expenses. If you sell the property at a gain, that capital gain is also subject to the 4.95% state income tax.

Frequently Asked Questions

Does Illinois have a state income tax on retirement income?

Illinois does not tax Social Security benefits or pensions from Illinois public employee systems (teachers, police, firefighters). However, pensions from private employers and out-of-state public systems are taxed at 4.95%. Wages and investment income are always taxed, even in retirement.

What is the difference between assessed value and market value for property tax?

Market value is what your home would sell for today. Assessed value is typically 33.33% of market value in Illinois. Your property tax is calculated using assessed value, not market value, so a $300,000 home might have an assessed value of $100,000 and a much lower tax bill as a result.

Can I appeal my property tax assessment if I think it is too high?

Yes. You can file a complaint with your county assessor's office, usually within 30 days of receiving your assessment notice. If you disagree with the assessor's decision, you can appeal to your county's Board of Review. important date vary by county, so contact your assessor's office for specific dates.

Are groceries taxed in Illinois?

No. Groceries and prescription drugs are exempt from sales tax in Illinois. However, prepared foods, restaurant meals, and over-the-counter medicines are taxed. The distinction is whether the item is ready to eat or intended for when ready consumption.

What happens if I do not pay my property tax bill on time?

Your county will charge penalties and interest, typically starting at 1.5% per month. If property tax remains unpaid for several years, the county may place a lien on your home or sell the property at a tax sale. Contact your county treasurer when ready if you cannot pay by the due date to discuss payment plans.