See exactly how Illinois's 5.0% state income tax affects your paycheck. Calculate take-home pay after federal tax, FICA, Illinois state tax, and pre-tax deductions using 2026 IRS rates.
Estimates based on 2026 IRS rates and standard deductions. Actual withholding may vary based on W-4 elections and employer benefit plans.
Enter your annual salary on the left to see your take-home breakdown instantly.
Single filer · Standard deduction · No 401(k)
| Annual Salary | Federal Tax | FICA | IL Tax | Take-Home | Eff. Rate |
|---|---|---|---|---|---|
| $30,000 | $1,430 | $2,295 | $688 | $25,587 | 14.71% |
| $45,000 | $3,230 | $3,443 | $1,431 | $36,897 | 18.01% |
| $60,000 | $5,030 | $4,590 | $2,173 | $48,207 | 19.65% |
| $75,000 | $7,872 | $5,738 | $2,916 | $58,475 | 22.03% |
| $100,000 | $13,372 | $7,650 | $4,153 | $74,825 | 25.18% |
| $125,000 | $18,983 | $9,563 | $5,391 | $91,064 | 27.15% |
| $150,000 | $24,983 | $11,475 | $6,628 | $106,914 | 28.72% |
Illinois employers withhold state income tax from every paycheck based on the state's Flat 4.95% rate — Chicago adds local taxes. This withholding is separate from your federal income tax and is paid directly to the Illinois Department of Revenue. The state tax is calculated on your taxable income — your gross wages minus pre-tax deductions like 401(k) contributions and the standard deduction. For a Illinois worker earning $75,000, the annual state income tax is approximately $2,916.
Regardless of which state you live in, all US workers pay the same federal income taxes using the 2026 progressive brackets. For Illinois residents, federal income tax is calculated on taxable income after the standard deduction of $16,100 (single) or $32,200 (married filing jointly). The 2026 federal brackets range from 10% on the first $11,925 of taxable income up to 37% on income above $626,350. Most Illinois workers fall into the 12% or 22% federal bracket. A single Illinois resident earning $75,000 pays approximately $9,424 in federal income tax.
FICA taxes are the same in Illinois as everywhere in the US. Your employer withholds 6.2% of your gross wages for Social Security (up to the 2026 wage base of $184,500) and 1.45% for Medicare on all wages. This 7.65% combined FICA rate applies regardless of your state — so Illinois workers pay the same FICA as workers in California or Texas. On a $75,000 salary, FICA totals $5,738 per year ($478/month). Your employer pays an equal 7.65% on top of your wages, bringing the total FICA contribution to 15.3%.
Contributing to a 401(k) or other pre-tax retirement account reduces your taxable income for both federal and Illinois state income tax. In 2026, you can contribute up to $24,500 to your 401(k) ($32,500 if age 50 or older). Every dollar you contribute reduces your federal taxable income by one dollar — saving both federal and Illinois state income taxes. Health insurance premiums paid through your employer are also typically pre-tax, reducing your federal, Illinois state, and FICA taxes simultaneously.
Your gross annual salary divided by the number of pay periods gives your gross per-paycheck amount. The most common pay frequencies in Illinois are bi-weekly (26 paychecks per year) and semi-monthly (24 paychecks). Bi-weekly employees receive an extra "third paycheck" in two months each year since 52 weeks ÷ 2 = 26 paychecks. Tax withholding is calculated per paycheck, so your per-check withholding depends on your pay frequency. Our Illinois paycheck calculator above handles all pay frequencies — just select yours from the dropdown to see your exact take-home for each pay period.
Your W-4 form tells your Illinois employer how much federal income tax to withhold from each paycheck. The 2020 redesigned W-4 eliminates withholding allowances and instead uses dollar amounts for deductions and other income. Most employees should use the standard withholding, but if you have significant investment income, a side business, or multiple jobs, you may need to adjust. Illinois may have its own state withholding form in addition to the federal W-4. Our paycheck calculator estimates withholding based on the 2026 IRS percentage method.
Free tools for Illinois residents
All free, all updated for 2026