Last updated: 2025 BLS data · Page refreshed:
How much does a Environmental Engineers actually take home in Illinois?
5.0% flat rate — 27.0% effective total tax rateData: BLS OEWS 2025 + IRS/State Tax Brackets 2024 • Updated 2026-05-19
Detailed line-by-line tax calculation for a Environmental Engineers earning $107,990 in Illinois (single filer, standard deduction).
| Tax Component | Annual Amount | Effective Rate |
|---|---|---|
| Gross Salary (Median) | $107,990 | — |
| Federal Income Tax | -$15,598 | 14.4% |
| Illinois State Income Tax | -$5,345 | 5.0% |
| Social Security (OASDI) | -$6,695 | 6.2% |
| Medicare | -$1,565 | 1.5% |
| Total Taxes | -$29,205 | 27.0% |
| Take-Home Pay | $78,784 | 73.0% |
Take-home pay varies significantly across experience levels. Here is the after-tax breakdown for each salary percentile of Environmental Engineers in Illinois.
| Percentile | Gross Salary | Total Taxes | Take-Home Pay | Tax Rate |
|---|---|---|---|---|
| 10th Percentile (P10) | $71,990 | -$16,749 | $55,240 | 23.3% |
| 25th Percentile (P25) | $87,090 | -$21,974 | $65,115 | 25.2% |
| Median (P50) | $107,990 | -$29,205 | $78,784 | 27.0% |
| 75th Percentile (P75) | $123,960 | -$34,907 | $89,052 | 28.2% |
| 90th Percentile (P90) | $153,150 | -$45,591 | $107,558 | 29.8% |
After federal income tax ($15,598), state tax ($5,345), and FICA ($8,261), a Environmental Engineers in Illinois takes home $78,784 per year — or $6,565 per month. The effective tax rate of 27.0% is moderate compared to the national range.
A Environmental Engineers in Illinois loses 27.0% of gross pay to taxes — higher than the ~25% national midpoint. Of the $107,990 gross, $78,784 lands in the paycheck after federal ($15,599), state ($5,346), and FICA ($8,261) withholding.
Illinois applies a flat state income tax — every dollar of wage income is taxed at the same rate. For this Environmental Engineers salary that contributes $5,346 to the 5.0% effective state-tax burden.
Federal tax on this Environmental Engineers salary is $15,599 (53%), but combined state ($5,346, 18%) + FICA ($8,261, 28%) make up the other 47% of the bill.
Moving this same Environmental Engineers salary to a zero-state-tax state would yield around $84,130 net — a gain of $5,346 (6.8%) per year versus Illinois.
Illinois ranks #18 of 50 states for Environmental Engineers after-tax pay — comfortably in the upper half.
Translated into paycheck cadences, $78,784 net/year works out to $6,565/month or $3,030/bi-weekly for this Environmental Engineers in Illinois — the numbers that actually hit a checking account after every deduction.
Where does a Environmental Engineers keep the most of their paycheck? Top 10 states ranked by after-tax take-home pay.
Illinois ranks #18 out of 50 states for Environmental Engineers after-tax take-home pay.
A Environmental Engineers in Illinois earning a median salary of $107,990 will take home approximately $78,784 per year after federal income tax ($15,598), state income tax ($5,345), and FICA ($8,261). That is $6,565 per month or $3,030 per bi-weekly paycheck.
The effective total tax rate for a Environmental Engineers in Illinois is 27.0%, broken down as: federal income tax 14.4%, Illinois state tax 5.0%, and FICA (Social Security + Medicare) 7.7%. This assumes a single filer with the standard deduction for 2024.
Illinois has a 5.0% flat rate. On a Environmental Engineers's median salary of $107,990, the state income tax amounts to $5,345 per year, which is an effective state rate of 5.0%.
After all taxes, a Environmental Engineers in Illinois takes home approximately $6,565 per month, or about $37.88 per hour (based on a standard 2,080-hour work year). These figures assume a single filer, standard deduction, and no additional pre-tax deductions.
We start with the 2025 BLS median salary of $107,990 for Environmental Engineers in Illinois, then subtract: federal income tax using 2024 IRS brackets ($14,600 standard deduction), Illinois state income tax (5.0% flat rate), Social Security (6.2% up to $168,600), and Medicare (1.45%). The result — $78,784/yr — does not include local taxes, pre-tax deductions (401k, HSA), or tax credits.
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This estimate assumes a single filer using the 2024 standard deduction ($14,600), with W-2 employment income only. It does not account for: itemized deductions, tax credits (e.g. earned income credit, child tax credit), local/city taxes, pre-tax contributions (401k, HSA, FSA), self-employment tax, or additional income sources. Actual take-home pay may differ. Consult a tax professional for personalized advice.
Our Methodology · Data Sources · Salary: BLS OEWS · Tax: IRS + State DOR