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Illinois Paycheck Overview

Illinois uses a flat income tax rate of 4.95%, meaning every worker pays the same percentage regardless of how much they earn. This simplicity makes it easy to calculate your state tax: multiply your taxable income by 0.0495. However, the flat rate also means lower-income workers pay the same rate as high earners, which is a notable difference from progressive-tax states where lower incomes face lower rates.

How the Illinois Flat Tax Works

Unlike federal taxes with multiple brackets, Illinois applies 4.95% to all taxable income after the personal exemption. For 2026, the personal exemption is $2,625 per person. A single filer with $50,000 in gross income has taxable income of $47,375 and pays $2,345 in state income tax. For married filers, the combined exemption is $5,250. The flat rate makes paycheck calculations predictable: every additional dollar of income is taxed at exactly 4.95%.

For a single filer earning $70,000 annually, here is the Illinois state tax calculation:

• Gross income: $70,000
• Personal exemption: $2,625
• Taxable income: $67,375
• State tax (4.95%): $3,335
• Per biweekly paycheck: approximately $128

This compares to $2,149 in Pennsylvania (3.07%), $2,142 in Indiana (3.05% after exemptions), and $0 in bordering states with no income tax. The simplicity of the flat rate means there are no surprises with bracket jumps when you receive a raise or bonus.

Illinois voters rejected a proposed constitutional amendment in 2020 that would have switched to a graduated income tax. The flat tax structure is enshrined in the state constitution and would require another voter-approved amendment to change.

Local Taxes in Illinois

Illinois does not have a local income tax, but it does have high property taxes (averaging 2.07%, among the highest in the nation) and a combined state and local sales tax that can exceed 10% in Chicago (10.25% in the city). For paycheck purposes, you only need to account for the flat 4.95% state tax alongside your federal withholding and FICA. The absence of local income taxes keeps paycheck calculations simple, unlike neighboring Ohio where 600+ municipalities levy their own income taxes.

Illinois Credits and Deductions

Although Illinois has a flat tax, several credits can reduce your overall bill. The Illinois Earned Income Credit equals 20% of the federal EITC, providing up to $1,540 for families with three or more qualifying children. The Illinois Property Tax Credit allows you to claim 5% of property taxes paid on your primary residence, which for a homeowner paying $6,000 in property taxes means a $300 reduction in state income tax. The Education Expense Credit provides 25% of qualifying K-12 education expenses (up to $750 per family) for tuition, books, and lab fees at qualifying schools. The Illinois Child Tax Credit, enacted in 2024, provides a refundable credit for families with dependents under 12 and qualifying income levels. Workers should also be aware of the Illinois Student Loan Interest deduction, which mirrors the federal deduction and can reduce taxable income.

Cost of Living Across Illinois

Illinois has a stark cost-of-living divide between the Chicago metropolitan area and downstate communities. In downtown Chicago, median home prices are approximately $350,000 to $420,000 and one-bedroom apartment rents average $1,800 to $2,400 per month. Suburban areas like Naperville, Evanston, and Schaumburg have median homes from $350,000 to $550,000 with rents of $1,500 to $2,000. Downstate cities are dramatically cheaper: Springfield has median home prices near $145,000 with rents of $800 to $1,000; Peoria is similar at $130,000 and $750 to $950; and Champaign-Urbana runs $200,000 for median homes with $900 to $1,200 rents. For a worker earning $70,000, the purchasing power in Springfield is roughly 40-50% higher than in Chicago once housing costs are factored in, even though the state income tax rate is identical.

Employment and Economy

Illinois has the fifth-largest state economy in the nation, with Chicago serving as a major global financial and transportation hub. Major employers include Walgreens Boots Alliance (headquartered in Deerfield), Abbott Laboratories, Caterpillar, Boeing's corporate operations, and numerous financial services firms. The healthcare sector is led by Northwestern Medicine, Advocate Aurora Health, and the University of Chicago Medical Center. Chicago's tech scene has grown substantially, with companies like Grubhub, Groupon, and numerous fintech startups. The state's agriculture sector remains significant downstate, with Illinois ranking as a top producer of soybeans and corn. The median household income statewide is approximately $72,200, with Chicago metro area wages averaging 15-20% higher than downstate communities. The unemployment rate hovers around 4.3%, slightly above the national average. Despite fiscal challenges at the state level, the private sector economy remains robust, particularly in the Chicago metro area and along the Interstate 88 technology corridor in the western suburbs.

Illinois-Specific Considerations

Illinois does not tax retirement income from most sources, including Social Security, pensions, 401(k) distributions, and IRA withdrawals. This makes the state more attractive for retirees despite its high tax burden during working years. For current workers, 401(k) contributions reduce both federal and state taxable income, providing savings at both levels.

Tips for Illinois Workers

• Pre-tax contributions are valuable: At a flat 4.95% plus your federal marginal rate, every dollar you put into a 401(k) saves you at least $0.17 to $0.27 in taxes. Maxing out the $24,500 annual 401(k) limit in 2026 saves approximately $1,163 in state tax alone.
• Claim the property tax credit: If you own a home, the 5% property tax credit directly reduces your state income tax. On a $7,000 property tax bill (common in many suburban areas), that is a $350 credit you should not overlook.
• Budget for the full picture: While your state income tax is a flat 4.95%, Illinois workers face some of the highest property taxes in the country. A $300,000 home in the suburbs can carry a $6,000 to $9,000 annual property tax bill, which effectively doubles the impact of the income tax for homeowners.
• Check your withholding accuracy: Because the rate is flat, over-withholding is less common than in progressive states, but it still happens if your W-4 and state elections are not aligned.
• Consider the retirement advantage: Illinois does not tax retirement distributions. If you plan to stay in Illinois for retirement, your effective tax burden drops substantially once you stop working. A retiree drawing $60,000 from pensions and 401(k) plans pays $0 in state income tax.
• Compare to neighboring states: Indiana's flat rate is 3.05%, Wisconsin ranges from 3.5% to 7.65%, Iowa ranges from 4.4% to 6.0%, and Missouri from 2% to 4.8%. Illinois falls in the middle for the region.
• Use the Illinois EITC: If you qualify for the federal Earned Income Tax Credit, you automatically receive the Illinois supplement at 20% of your federal credit. A qualifying family earning $40,000 with two children could receive an additional $1,200 to $1,400 in refundable state credit.

How Illinois Compares

At 4.95%, Illinois's flat rate is higher than Indiana (3.05%), Michigan (4.25%), and Pennsylvania (3.07%), but lower than the top rates in Minnesota (9.85%), Wisconsin (7.65%), and Iowa (6.0%). The flat structure means low earners pay relatively more and high earners pay relatively less compared to progressive states with similar effective rates. For a worker earning $65,000, the Illinois state tax of approximately $3,090 compares to $2,730 in Indiana, $2,600 in Michigan, and $0 in a no-tax state.

For a single filer earning $70,000, Illinois state tax is approximately $3,335. Compare this to $2,149 in Pennsylvania, $2,142 in Indiana, $2,860 in Michigan, $3,348 in New York State, and $0 in Florida or Texas. When property taxes are included, however, Illinois's total state and local tax burden rises significantly. A homeowner with a $300,000 home paying $6,200 in property taxes plus $3,335 in income tax bears a combined $9,535 burden, among the highest in the Midwest.

Frequently Asked Questions

What is the Illinois income tax rate?

Illinois has a flat income tax rate of 4.95% for all individual taxpayers. This rate applies to all taxable income after the personal exemption of $2,625 per person. The flat rate means your tax calculation is straightforward: for a $70,000 earner, state tax is approximately $3,335 annually.

Does Illinois have local income taxes?

No. Unlike Ohio or New York, Illinois does not permit cities or counties to levy local income taxes. The 4.95% state rate is the only income tax you pay in Illinois. However, Chicago's high sales tax (10.25%) and property taxes partially offset this simplicity in terms of overall tax burden.

How does the Illinois personal exemption work?

Each taxpayer claims a $2,625 personal exemption that reduces taxable income. Married filers filing jointly receive $5,250. Each dependent adds another $2,625. This reduces your state tax by about $130 per exemption. A married couple with two children, for example, saves approximately $520 through combined exemptions of $10,500.

Is the Illinois flat tax fair?

This is debated. Supporters argue it is simple and treats all income equally. Critics note that a flat rate disproportionately burdens lower-income workers, who spend a larger share of their income on necessities and also face high sales and property taxes. The 2020 ballot measure to switch to graduated rates was rejected by voters.

Will Illinois switch to a graduated income tax?

Voters rejected the "Fair Tax" amendment in November 2020 by a 55% to 45% margin. Any future attempt would require another constitutional amendment and voter approval, making a change unlikely in the near term. The state legislature has not introduced a new amendment proposal since the 2020 defeat.

Does Illinois tax retirement income?

No. Illinois does not tax Social Security, pension income, 401(k) distributions, or IRA withdrawals. This is one of the most generous retirement tax policies in the nation and partially offsets the higher tax burden during working years. A retiree with $60,000 in annual pension and Social Security income pays zero state income tax in Illinois.