Illinois Paycheck Calculator 2026
If you're working in Illinois or considering a job offer in the Prairie State, understanding your actual take-home pay is crucial for financial planning. Illinois utilizes a flat 4.95% state income tax, which means every dollar of taxable income is taxed at the exact same rate. This provides predictable calculations for both low and high-income earners.
Use our interactive Illinois paycheck calculator below to instantly determine your per-paycheck and annual net pay after federal taxes, state taxes, FICA, and your personal pre-tax deductions.
Calculate Your IL Take-Home Pay
Understanding Illinois's 4.95% Flat Tax System
Illinois simplifies its tax preparation by using a single, flat rate for all individual income. Because there are no progressive brackets, estimating your state tax liability is straightforward.
| Tax Feature | 2026 Rate / Amount |
|---|---|
| State Income Tax Rate | 4.95% (Flat Rate on all taxable income) |
| Local Income Taxes | None (Illinois does not allow city/county personal income taxes) |
| State Standard Deduction (Single) | $13,850 (Illinois uses the federal standard deduction amount) |
| State Standard Deduction (Married) | $27,700 |
| State Sales Tax | 6.25% base (Local rates can bring the total up to 10.75%) |
Example: Illinois Salary After Taxes Calculation
Let's look at the math for a worker earning $90,000 per year in Chicago (filing jointly, with a 6% pre-tax 401(k) contribution):
- Gross annual salary: $90,000
- 401(k) contribution (6% pre-tax): -$5,400
- Federal income tax: ~$6,200
- FICA taxes (Social Security + Medicare): $6,885
- Illinois state tax (4.95% flat on taxable income): ~$2,806
- Annual net pay: $68,709
- Bi-weekly paycheck: ~$2,643
Comparing Illinois to Neighboring States
If you are evaluating job offers in the Midwest, here is how Illinois stacks up against its neighbors:
- Indiana & Michigan: Both states feature flat taxes that are lower than Illinois (3.23% in IN and 4.25% in MI). Someone earning $90,000 in IL will generally take home less money than their neighbors to the east.
- Wisconsin & Iowa: Both states use progressive tax brackets that scale much higher than Illinois (up to 7.65% and 8.53% respectively). For middle-to-high income earners, Illinois's 4.95% rate is often more favorable.
2026 Planning Tips for Illinois Employees
- Maximize Pre-Tax Benefits: Every dollar you contribute to a 401(k), traditional IRA, or HSA reduces both your federal and Illinois taxable income. This gives you a guaranteed 4.95% state tax savings on top of your federal savings.
- Factor in Property Taxes: While Illinois's income tax is moderate, the state has some of the highest property taxes in the nation, particularly in Cook County. Ensure your net pay calculation adequately covers your specific local housing expenses.
- Watch the Social Security Limit: The Social Security wage base for 2026 limits the 6.2% OASDI tax to high earners. Once your year-to-date income passes this limit, your IL paycheck will see a noticeable bump for the remainder of the year.
Frequently Asked Questions
Does Illinois have local city or county income taxes?
No. Illinois does not allow local municipalities to levy personal income taxes. Even if you work in Chicago, your paycheck will only be subject to federal, FICA, and the state's 4.95% flat rate.
What percentage of my salary goes to taxes in Illinois?
For most workers earning between $50,000 and $100,000, expect to pay approximately 25% to 31% of your gross income to combined federal, state, and FICA taxes.
Is Illinois's flat tax better than a progressive tax?
It depends on your income. A flat tax is highly favorable for high earners because the rate never increases. For entry-level workers, the flat system is generally less favorable than a progressive system with low bottom-tier rates.