Illinois payroll taxes 2026 are, by any measure, among the cleanest in the country. One flat rate. Zero local income tax. A UI system with a single number for new employers. If you run a small business here, you can nail your withholding formula in the time it takes to finish a cup of coffee — and never look it up again.
\n\n- \n
- State income tax: flat 4.95% — no brackets, no formulas \n
- FICA: 6.2% Social Security (wage base $176,100) + 1.45% Medicare \n
- UI tax (new employers): 3.175% on first $13,590 per employee \n
- Chicago: no city income tax — but minimum wage and paid leave rules apply \n
- Calculation: gross wages × 0.0495 for state withholding — that's it \n
Illinois Payroll Tax Rates at a Glance (2026)
\n\nIllinois uses a flat income tax. Every employee — entry-level, executive, everyone — pays the same 4.95% rate. No brackets to look up. No different formulas for different pay grades. That simplicity is a genuine advantage over neighboring states like Indiana, which layers county-level income taxes on top of its state rate and turns a five-minute calculation into a lookup table problem.
\n\n\n\nHere's the full picture for 2026:
\n\n| Tax | \nRate | \nWage Base | \nWho Pays | \n
|---|---|---|---|
| Illinois State Income Tax | \n4.95% | \nAll wages | \nEmployee (withheld by employer) | \n
| Social Security (FICA) | \n6.2% each | \n$176,100 | \nEmployee + Employer (split) | \n
| Medicare (FICA) | \n1.45% each | \nNo cap | \nEmployee + Employer (split) | \n
| FUTA (Federal UI) | \n0.6% net | \n$7,000 | \nEmployer only | \n
| Illinois UI Tax | \n3.175% (new) | \n$13,590 | \nEmployer only | \n
FUTA's listed rate is 6% on the first $7,000. Illinois employers typically claim the full 5.4% federal credit — cutting the effective net rate to 0.6%, or a maximum of $42 per employee per year. File Form 941 each quarter to report federal payroll tax deposits and keep your credit intact.
\n\nIllinois Unemployment Insurance (UI) Tax 2026
\n\nThis is the piece that varies most by employer, so it deserves your full attention. Brand-new employers get a fixed starting rate from IDES — no guesswork, no negotiation.
\n\nStick around. After your first year with employees on payroll, IDES assigns an experience-based rate. That range runs from roughly 0.55% to 7.35% — driven entirely by your claim history. Keep layoffs low, keep your rate low. Register at ides.illinois.gov and file quarterly using Form UI-3/40.
\n\n\n\n\nIllinois has no local income tax anywhere in the state — not in Chicago, not in Cook County, not anywhere. That alone cuts out an enormous amount of complexity.\n\n\n
No local income tax is a bigger deal than it sounds. Compare it to Maryland, where employers manage county-level withholding stacked on top of the state rate. In Illinois, the math stays clean throughout the year. New to payroll entirely? Small Business Payroll 101 covers the fundamentals before you go state-specific.
\n\nChicago Employer Notes
\n\nIllinois has no local income tax, even in Chicago. Your withholding math stays simple. Chicago does have its own wage and leave rules — those govern daily operations, not your tax calculations.
\nNo city income tax. Full stop. But two local ordinances apply to Chicago employers. The Chicago Minimum Wage Ordinance sets the rate at $16.20/hr for businesses with 21 or more employees; micro-businesses with 1–10 staff may fall under a lower applicable tier — check the current schedule at chicago.gov, since it adjusts annually. The Chicago Paid Leave Ordinance mandates 1 hour of paid leave for every 35 hours worked. Outside Chicago city limits but still in Cook County? The Cook County Minimum Wage applies instead.
\n\nHow to Calculate Illinois Payroll Withholding (Step-by-Step)
\n\nTake Marcus, a plumbing contractor in Springfield with three employees. He runs this sequence every pay period. So should you.
\n\nIllinois has held its flat 4.95% income tax rate since 2017. A 2020 ballot measure to move to a graduated rate structure failed — which means employers can plan with confidence. This calculation isn't changing.
\nKeep your Q4 payroll deadlines visible as the year closes out. Quarterly deposits, annual FUTA reconciliation, and W-2 distribution all converge in the final stretch — missing one creates a cascade.
\n\nIllinois payroll is about as clean as it gets for a state this size. Flat 4.95% income tax. No local income tax anywhere. A UI system run entirely through IDES. Know your new employer rate (3.175% on the first $13,590), match your FICA, and file quarterly. Chicago employers add minimum wage and paid leave compliance — the withholding math stays identical. Pay records must reflect actual wages paid; falsifying payroll documents is illegal and carries serious penalties.
\nFrequently Asked Questions
\n\nDoes Illinois have a local income tax in 2026?
\nNo. Illinois has no local income tax anywhere in the state, including Chicago. Employers withhold only the flat 4.95% state income tax plus federal taxes — no city or county income tax calculations required.
\n\nWhat is the Illinois UI tax rate for new employers in 2026?
\nNew employers in Illinois pay a UI tax rate of 3.175% on the first $13,590 of each employee's wages. After your first year, IDES assigns an experience-based rate ranging from roughly 0.55% to 7.35% depending on your claim history.
\n\nHow much Illinois state tax do I withhold from employee paychecks?
\nA flat 4.95% of each employee's taxable wages. No brackets, no complex formulas — multiply gross wages (minus pre-tax deductions) by 0.0495 and you're done.
\n\nDo I need to register with IDES if I only have one employee?
\nYes. Any Illinois employer paying wages must register with the Illinois Department of Employment Security and file quarterly UI reports, even with a single employee. Register at ides.illinois.gov before running your first payroll.
\n\nHow does Illinois compare to neighboring states for payroll complexity?
\nIllinois is simpler than most neighbors. Indiana has county-level income taxes stacked on the state rate. Wisconsin uses a graduated income tax with multiple brackets. Illinois's flat rate with no local income tax makes it one of the cleaner payroll environments in the Midwest — full stop.
\n\nRun Illinois Payroll Without the Headaches
\nGenerate pay stubs, track withholding, and stay compliant — built for micro-businesses with 1–10 employees.
\nCalculate Illinois Payroll Free → PayHRoll.com\n