Last updated: 2025 BLS data · Page refreshed:
How much does a Civil Engineers actually take home in Illinois?
5.0% flat rate — 26.4% effective total tax rateData: BLS OEWS 2025 + IRS/State Tax Brackets 2024 • Updated 2026-05-19
Detailed line-by-line tax calculation for a Civil Engineers earning $99,760 in Illinois (single filer, standard deduction).
| Tax Component | Annual Amount | Effective Rate |
|---|---|---|
| Gross Salary (Median) | $99,760 | — |
| Federal Income Tax | -$13,788 | 13.8% |
| Illinois State Income Tax | -$4,938 | 5.0% |
| Social Security (OASDI) | -$6,185 | 6.2% |
| Medicare | -$1,446 | 1.4% |
| Total Taxes | -$26,357 | 26.4% |
| Take-Home Pay | $73,402 | 73.6% |
Take-home pay varies significantly across experience levels. Here is the after-tax breakdown for each salary percentile of Civil Engineers in Illinois.
| Percentile | Gross Salary | Total Taxes | Take-Home Pay | Tax Rate |
|---|---|---|---|---|
| 10th Percentile (P10) | $69,590 | -$15,919 | $53,670 | 22.9% |
| 25th Percentile (P25) | $79,650 | -$19,399 | $60,250 | 24.4% |
| Median (P50) | $99,760 | -$26,357 | $73,402 | 26.4% |
| 75th Percentile (P75) | $125,990 | -$35,650 | $90,339 | 28.3% |
| 90th Percentile (P90) | $157,410 | -$47,150 | $110,259 | 30.0% |
After federal income tax ($13,788), state tax ($4,938), and FICA ($7,631), a Civil Engineers in Illinois takes home $73,402 per year — or $6,116 per month. The effective tax rate of 26.4% is moderate compared to the national range.
A Civil Engineers in Illinois loses 26.4% of gross pay to taxes — higher than the ~25% national midpoint. Of the $99,760 gross, $73,402 lands in the paycheck after federal ($13,788), state ($4,938), and FICA ($7,632) withholding.
Illinois applies a flat state income tax — every dollar of wage income is taxed at the same rate. For this Civil Engineers salary that contributes $4,938 to the 5.0% effective state-tax burden.
Federal tax on this Civil Engineers salary is $13,788 (52%), but combined state ($4,938, 19%) + FICA ($7,632, 29%) make up the other 48% of the bill.
Moving this same Civil Engineers salary to a zero-state-tax state would yield around $78,340 net — a gain of $4,938 (6.7%) per year versus Illinois.
Illinois ranks #29 of 51 states for Civil Engineers after-tax pay — lower half of the national distribution. Either gross wages trail the national median, state tax is elevated, or both.
Translated into paycheck cadences, $73,402 net/year works out to $6,117/month or $2,823/bi-weekly for this Civil Engineers in Illinois — the numbers that actually hit a checking account after every deduction.
Where does a Civil Engineers keep the most of their paycheck? Top 10 states ranked by after-tax take-home pay.
Illinois ranks #29 out of 51 states for Civil Engineers after-tax take-home pay.
A Civil Engineers in Illinois earning a median salary of $99,760 will take home approximately $73,402 per year after federal income tax ($13,788), state income tax ($4,938), and FICA ($7,631). That is $6,116 per month or $2,823 per bi-weekly paycheck.
The effective total tax rate for a Civil Engineers in Illinois is 26.4%, broken down as: federal income tax 13.8%, Illinois state tax 5.0%, and FICA (Social Security + Medicare) 7.6%. This assumes a single filer with the standard deduction for 2024.
Illinois has a 5.0% flat rate. On a Civil Engineers's median salary of $99,760, the state income tax amounts to $4,938 per year, which is an effective state rate of 5.0%.
After all taxes, a Civil Engineers in Illinois takes home approximately $6,116 per month, or about $35.29 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 $99,760 for Civil 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 — $73,402/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