Last updated: 2025 BLS data · Page refreshed:
How much does a Mechanical Engineers actually take home in Illinois?
5.0% flat rate — 26.7% effective total tax rateData: BLS OEWS 2025 + IRS/State Tax Brackets 2024 • Updated 2026-05-19
Detailed line-by-line tax calculation for a Mechanical Engineers earning $102,680 in Illinois (single filer, standard deduction).
| Tax Component | Annual Amount | Effective Rate |
|---|---|---|
| Gross Salary (Median) | $102,680 | — |
| Federal Income Tax | -$14,430 | 14.1% |
| Illinois State Income Tax | -$5,082 | 4.9% |
| Social Security (OASDI) | -$6,366 | 6.2% |
| Medicare | -$1,488 | 1.4% |
| Total Taxes | -$27,368 | 26.7% |
| Take-Home Pay | $75,311 | 73.3% |
Take-home pay varies significantly across experience levels. Here is the after-tax breakdown for each salary percentile of Mechanical Engineers in Illinois.
| Percentile | Gross Salary | Total Taxes | Take-Home Pay | Tax Rate |
|---|---|---|---|---|
| 10th Percentile (P10) | $72,150 | -$16,804 | $55,345 | 23.3% |
| 25th Percentile (P25) | $83,800 | -$20,835 | $62,964 | 24.9% |
| Median (P50) | $102,680 | -$27,368 | $75,311 | 26.7% |
| 75th Percentile (P75) | $130,730 | -$37,385 | $93,344 | 28.6% |
| 90th Percentile (P90) | $160,160 | -$48,157 | $112,002 | 30.1% |
After federal income tax ($14,430), state tax ($5,082), and FICA ($7,855), a Mechanical Engineers in Illinois takes home $75,311 per year — or $6,275 per month. The effective tax rate of 26.7% is moderate compared to the national range.
A Mechanical Engineers in Illinois loses 26.7% of gross pay to taxes — higher than the ~25% national midpoint. Of the $102,680 gross, $75,312 lands in the paycheck after federal ($14,431), state ($5,083), and FICA ($7,855) withholding.
Illinois applies a flat state income tax — every dollar of wage income is taxed at the same rate. For this Mechanical Engineers salary that contributes $5,083 to the 4.9% effective state-tax burden.
Federal tax on this Mechanical Engineers salary is $14,431 (53%), but combined state ($5,083, 19%) + FICA ($7,855, 29%) make up the other 47% of the bill.
Moving this same Mechanical Engineers salary to a zero-state-tax state would yield around $80,394 net — a gain of $5,083 (6.7%) per year versus Illinois.
Illinois ranks #27 of 51 states for Mechanical 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, $75,312 net/year works out to $6,276/month or $2,897/bi-weekly for this Mechanical Engineers in Illinois — the numbers that actually hit a checking account after every deduction.
Where does a Mechanical Engineers keep the most of their paycheck? Top 10 states ranked by after-tax take-home pay.
Illinois ranks #27 out of 51 states for Mechanical Engineers after-tax take-home pay.
A Mechanical Engineers in Illinois earning a median salary of $102,680 will take home approximately $75,311 per year after federal income tax ($14,430), state income tax ($5,082), and FICA ($7,855). That is $6,275 per month or $2,896 per bi-weekly paycheck.
The effective total tax rate for a Mechanical Engineers in Illinois is 26.7%, broken down as: federal income tax 14.1%, Illinois state tax 4.9%, 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 Mechanical Engineers's median salary of $102,680, the state income tax amounts to $5,082 per year, which is an effective state rate of 4.9%.
After all taxes, a Mechanical Engineers in Illinois takes home approximately $6,275 per month, or about $36.21 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 $102,680 for Mechanical 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 — $75,311/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