Illinois income tax, 2026
What a salary actually costs in Illinois, 37th lowest of 51 at $100,000, and a line-by-line account of where that money is spent.
On a $100,000 salary in Illinois, you keep $74,371 after income tax and payroll contributions. That is an effective rate of 25.63%. Every extra dollar you earn is taxed at 26.95%.
Of that, $4,809 goes to Illinois and the rest to the federal government.
Among the 51 US states and DC, Illinois ranks 37th lowest at this income. The same salary would cost $20,820 in Alaska and $28,810 in New York, a spread of $7,990 a year.
Your $25,629 funds benefits & pensions more than anything else ($6,041), followed by health ($5,429) and debt interest ($3,335).
Where it goes
Every dollar of gross income, by where it ends up.
- Federal income tax$13,170
- Payroll$7,650
- State$4,809
- Take-home$74,371
Itemised
Select any charge to see the bracket-by-bracket working.
| Charge | Level | Rate | Amount |
|---|---|---|---|
| Social Securityfederal · payroll · 6.20% · detail | federal · payroll | $6,200.00 | |
| Medicarefederal · payroll · 1.45% · detail | federal · payroll | $1,450.00 | |
| Federal income taxfederal · 22.00% · detail | federal | $13,170.00 | |
| Illinois income taxstate · 4.95% · detail | state | $4,808.92 | |
| Total tax | $25,628.92 | ||
| Take-home | $74,371.08 |
Where it is spent
Your $25,629 of income tax, apportioned across what these governments budget to spend. Select a category to see the programmes inside it, then click any programme for its explanation and five-year trend.
Five-year spending trends
Compare every programme on one chart, or choose a government to see both programme and category trends. Percentages keep inflation from making every line look larger over time.
38.1%+10.1 pp
All 69 programmes are plotted. Select one to bring its line forward; percentages are each programme's share of its government's total spending.
Sources: US Treasury Monthly Treasury Statement, Table 5 agency and programme outlays and US Census Bureau, Annual Survey of State Government Finances.
United States federal government FY2025: US Treasury, Monthly Treasury Statement Table 5, net outlays by agency for the fiscal year ended 2025-09-30, with the four largest agencies split into their published components. Medicare and Medicaid, Social Security and interest on the debt are shown separately from the departments that administer them, because reported as agencies they are three unreadable lines.
IL 2023: US Census Bureau, Annual Survey of State Government Finances, table GS00SG01.
- •Allocation is proportional to published spending, not a trace of your actual dollars. No specific payment funds a specific programme.
- •Governments run deficits, so total spending exceeds total tax revenue. These shares show the composition of spending, not a balanced ledger.
Every states at this income
Same $100,000 income everywhere else. The gap between best and worst is $7,990 a year.
- Federal
- State
- Local
- Payroll is identical everywhere, so it is excluded here.
What to check before trusting this
- •State figures are for tax year 2025 and every one has been cross-checked against the state's own published schedule or its enacting legislation (audited 2026-09-08). Confirm against the state revenue department before filing.