Illinois taxes wages at a single flat rate of 4.95% on taxable income after the personal exemption of $2,925. Federal income tax and FICA sit on top of the state layer, so the combined bill still rises in steps even though the state rate never changes. The ladder runs ten salaries from $25,000 to $300,000 through both layers.
On a $75,000 salary the combined deductions in this model are $16,975: $7,670 of federal income tax, $3,568 of Illinois state tax and $5,738 of FICA, leaving take-home pay of $58,025 — an effective rate of 22.6%.
| Gross salary | Federal tax | Illinois state tax | FICA | Total deductions | Take-home pay | Effective rate |
|---|---|---|---|---|---|---|
| $25,000 | $890 | $1,093 | $1,913 | $3,895 | $21,105 | 15.6% |
| $40,000 | $2,620 | $1,835 | $3,060 | $7,515 | $32,485 | 18.8% |
| $50,000 | $3,820 | $2,330 | $3,825 | $9,975 | $40,025 | 20.0% |
| $60,000 | $5,020 | $2,825 | $4,590 | $12,435 | $47,565 | 20.7% |
| $75,000 | $7,670 | $3,568 | $5,738 | $16,975 | $58,025 | 22.6% |
| $100,000 | $13,170 | $4,805 | $7,650 | $25,625 | $74,375 | 25.6% |
| $125,000 | $18,734 | $6,043 | $9,563 | $34,339 | $90,661 | 27.5% |
| $150,000 | $24,734 | $7,280 | $11,475 | $43,489 | $106,511 | 29.0% |
| $200,000 | $36,734 | $9,755 | $14,339 | $60,828 | $139,172 | 30.4% |
| $300,000 | $68,134 | $14,705 | $16,689 | $99,528 | $200,472 | 33.2% |
The $75,000 row is highlighted. FICA is Social Security (6.2% up to $184,500 of wages), Medicare (1.45%), Additional Medicare Tax (0.9% on wages above $200,000), the same on every state's ladder. Figures model a single employee with the standard federal and state allowances only.
Read the ladder from the bottom up. The combined effective rate starts at 15.6% on $25,000 and reaches 33.2% on $300,000, with the Illinois state line taking $1,093 of the lowest rung and $14,705 of the highest. The state tax column is the only part of the bill that changes if the same salary is earned in a different state; the federal tax and FICA columns are identical on every state's ladder.
The state layer starts from taxable income — gross pay minus the personal exemption of $2,925 — so the first $2,925 of pay carries no Illinois tax at all, and everything above it is charged at the single 4.95% rate. Two modelling points in the state file are worth knowing before you rely on a rung; they are listed under "What this guide leaves out" below.
The federal layer is the standard United States model: a single employee, the federal standard deduction and no itemised deductions or personal credits. The full method is on the Methodology page.
Run your own exact salary through the federal and Illinois layers, with the breakdown line by line.
Open the calculator →The federal layer on its own: bands, FICA and worked examples for the whole country.
Open the calculator →All 50 states and DC ranked by take-home pay on $100,000 and $50,000 salaries, computed from the same files as this guide.
See the ranking →Salary guides for every state, the no-income-tax states and the flat-tax states, in one index.
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