Last updated: 2025 BLS data · Page refreshed:
How much does a Computer and Information Research Scientists actually take home in Illinois?
5.0% flat rate — 28.9% effective total tax rateData: BLS OEWS 2025 + IRS/State Tax Brackets 2024 • Updated 2026-05-19
Detailed line-by-line tax calculation for a Computer and Information Research Scientists earning $136,540 in Illinois (single filer, standard deduction).
| Tax Component | Annual Amount | Effective Rate |
|---|---|---|
| Gross Salary (Median) | $136,540 | — |
| Federal Income Tax | -$22,308 | 16.3% |
| Illinois State Income Tax | -$6,758 | 5.0% |
| Social Security (OASDI) | -$8,465 | 6.2% |
| Medicare | -$1,979 | 1.4% |
| Total Taxes | -$39,512 | 28.9% |
| Take-Home Pay | $97,027 | 71.1% |
Take-home pay varies significantly across experience levels. Here is the after-tax breakdown for each salary percentile of Computer and Information Research Scientists in Illinois.
| Percentile | Gross Salary | Total Taxes | Take-Home Pay | Tax Rate |
|---|---|---|---|---|
| 10th Percentile (P10) | $49,190 | -$10,116 | $39,073 | 20.6% |
| 25th Percentile (P25) | $104,340 | -$27,942 | $76,397 | 26.8% |
| Median (P50) | $136,540 | -$39,512 | $97,027 | 28.9% |
| 75th Percentile (P75) | $170,390 | -$51,790 | $118,599 | 30.4% |
| 90th Percentile (P90) | $243,360 | -$77,308 | $166,051 | 31.8% |
After federal income tax ($22,308), state tax ($6,758), and FICA ($10,445), a Computer and Information Research Scientists in Illinois takes home $97,027 per year — or $8,085 per month. The effective tax rate of 28.9% is moderate compared to the national range.
A Computer and Information Research Scientists in Illinois loses 28.9% of gross pay to taxes — higher than the ~25% national midpoint. Of the $136,540 gross, $97,028 lands in the paycheck after federal ($22,308), state ($6,759), and FICA ($10,445) withholding.
Illinois applies a flat state income tax — every dollar of wage income is taxed at the same rate. For this Computer and Information Research Scientists salary that contributes $6,759 to the 5.0% effective state-tax burden.
Federal income tax ($22,308) accounts for 56% of the total tax bill — the single largest deduction. FICA adds $10,445 (26%), and state tax the remaining $6,759 (17%).
The state-tax gap is substantial: a Computer and Information Research Scientists earning this gross in a no-income-tax state would net about $103,787 — an extra $6,759 (7.0%) annually compared with Illinois.
Illinois ranks #14 of 35 states for Computer and Information Research Scientists after-tax pay — comfortably in the upper half.
Translated into paycheck cadences, $97,028 net/year works out to $8,086/month or $3,732/bi-weekly for this Computer and Information Research Scientists in Illinois — the numbers that actually hit a checking account after every deduction.
Where does a Computer and Information Research Scientists keep the most of their paycheck? Top 10 states ranked by after-tax take-home pay.
Illinois ranks #14 out of 35 states for Computer and Information Research Scientists after-tax take-home pay.
A Computer and Information Research Scientists in Illinois earning a median salary of $136,540 will take home approximately $97,027 per year after federal income tax ($22,308), state income tax ($6,758), and FICA ($10,445). That is $8,085 per month or $3,731 per bi-weekly paycheck.
The effective total tax rate for a Computer and Information Research Scientists in Illinois is 28.9%, broken down as: federal income tax 16.3%, 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 Computer and Information Research Scientists's median salary of $136,540, the state income tax amounts to $6,758 per year, which is an effective state rate of 5.0%.
After all taxes, a Computer and Information Research Scientists in Illinois takes home approximately $8,085 per month, or about $46.65 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 $136,540 for Computer and Information Research Scientists 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 — $97,027/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