Last updated: 2025 BLS data · Page refreshed:
How much does a Chemical Engineers actually take home in Illinois?
5.0% flat rate — 28.0% effective total tax rateData: BLS OEWS 2025 + IRS/State Tax Brackets 2024 • Updated 2026-05-19
Detailed line-by-line tax calculation for a Chemical Engineers earning $121,560 in Illinois (single filer, standard deduction).
| Tax Component | Annual Amount | Effective Rate |
|---|---|---|
| Gross Salary (Median) | $121,560 | — |
| Federal Income Tax | -$18,712 | 15.4% |
| Illinois State Income Tax | -$6,017 | 5.0% |
| Social Security (OASDI) | -$7,536 | 6.2% |
| Medicare | -$1,762 | 1.4% |
| Total Taxes | -$34,029 | 28.0% |
| Take-Home Pay | $87,530 | 72.0% |
Take-home pay varies significantly across experience levels. Here is the after-tax breakdown for each salary percentile of Chemical Engineers in Illinois.
| Percentile | Gross Salary | Total Taxes | Take-Home Pay | Tax Rate |
|---|---|---|---|---|
| 10th Percentile (P10) | $79,120 | -$19,216 | $59,903 | 24.3% |
| 25th Percentile (P25) | $95,800 | -$24,987 | $70,812 | 26.1% |
| Median (P50) | $121,560 | -$34,029 | $87,530 | 28.0% |
| 75th Percentile (P75) | $140,010 | -$40,782 | $99,227 | 29.1% |
| 90th Percentile (P90) | $176,110 | -$53,529 | $122,580 | 30.4% |
After federal income tax ($18,712), state tax ($6,017), and FICA ($9,299), a Chemical Engineers in Illinois takes home $87,530 per year — or $7,294 per month. The effective tax rate of 28.0% is moderate compared to the national range.
A Chemical Engineers in Illinois loses 28.0% of gross pay to taxes — higher than the ~25% national midpoint. Of the $121,560 gross, $87,531 lands in the paycheck after federal ($18,713), state ($6,017), and FICA ($9,299) withholding.
Illinois applies a flat state income tax — every dollar of wage income is taxed at the same rate. For this Chemical Engineers salary that contributes $6,017 to the 5.0% effective state-tax burden.
Federal tax on this Chemical Engineers salary is $18,713 (55%), but combined state ($6,017, 18%) + FICA ($9,299, 27%) make up the other 45% of the bill.
The state-tax gap is substantial: a Chemical Engineers earning this gross in a no-income-tax state would net about $93,548 — an extra $6,017 (6.9%) annually compared with Illinois.
Illinois ranks #16 of 41 states for Chemical Engineers after-tax pay — comfortably in the upper half.
Translated into paycheck cadences, $87,531 net/year works out to $7,294/month or $3,367/bi-weekly for this Chemical Engineers in Illinois — the numbers that actually hit a checking account after every deduction.
Where does a Chemical Engineers keep the most of their paycheck? Top 10 states ranked by after-tax take-home pay.
Illinois ranks #16 out of 41 states for Chemical Engineers after-tax take-home pay.
A Chemical Engineers in Illinois earning a median salary of $121,560 will take home approximately $87,530 per year after federal income tax ($18,712), state income tax ($6,017), and FICA ($9,299). That is $7,294 per month or $3,366 per bi-weekly paycheck.
The effective total tax rate for a Chemical Engineers in Illinois is 28.0%, broken down as: federal income tax 15.4%, 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 Chemical Engineers's median salary of $121,560, the state income tax amounts to $6,017 per year, which is an effective state rate of 5.0%.
After all taxes, a Chemical Engineers in Illinois takes home approximately $7,294 per month, or about $42.08 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 $121,560 for Chemical 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 — $87,530/yr — does not include local taxes, pre-tax deductions (401k, HSA), or tax credits.
Some links are affiliate links. See our disclosure.
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