Last updated: 2025 BLS data · Page refreshed:
How much does a Social Science Research Assistants actually take home in Illinois?
5.0% flat rate — 22.0% effective total tax rateData: BLS OEWS 2025 + IRS/State Tax Brackets 2024 • Updated 2026-05-19
Detailed line-by-line tax calculation for a Social Science Research Assistants earning $64,890 in Illinois (single filer, standard deduction).
| Tax Component | Annual Amount | Effective Rate |
|---|---|---|
| Gross Salary (Median) | $64,890 | — |
| Federal Income Tax | -$6,116 | 9.4% |
| Illinois State Income Tax | -$3,212 | 5.0% |
| Social Security (OASDI) | -$4,023 | 6.2% |
| Medicare | -$940 | 1.5% |
| Total Taxes | -$14,292 | 22.0% |
| Take-Home Pay | $50,597 | 78.0% |
Take-home pay varies significantly across experience levels. Here is the after-tax breakdown for each salary percentile of Social Science Research Assistants in Illinois.
| Percentile | Gross Salary | Total Taxes | Take-Home Pay | Tax Rate |
|---|---|---|---|---|
| 10th Percentile (P10) | $37,460 | -$7,231 | $30,228 | 19.3% |
| 25th Percentile (P25) | $47,720 | -$9,755 | $37,964 | 20.4% |
| Median (P50) | $64,890 | -$14,292 | $50,597 | 22.0% |
| 75th Percentile (P75) | $74,700 | -$17,687 | $57,012 | 23.7% |
| 90th Percentile (P90) | $116,530 | -$32,188 | $84,341 | 27.6% |
After federal income tax ($6,116), state tax ($3,212), and FICA ($4,964), a Social Science Research Assistants in Illinois takes home $50,597 per year — or $4,216 per month. The effective tax rate of 22.0% is relatively low compared to the national range.
With an effective total rate of 22.0%, a Social Science Research Assistants in Illinois keeps $50,597 of $64,890 gross — roughly typical for U.S. middle-income earners once federal, FICA and state taxes are combined.
Illinois applies a flat state income tax — every dollar of wage income is taxed at the same rate. For this Social Science Research Assistants salary that contributes $3,212 to the 5.0% effective state-tax burden.
Federal tax on this Social Science Research Assistants salary is $6,117 (43%), but combined state ($3,212, 22%) + FICA ($4,964, 35%) make up the other 57% of the bill.
Moving this same Social Science Research Assistants salary to a zero-state-tax state would yield around $53,809 net — a gain of $3,212 (6.3%) per year versus Illinois.
For Social Science Research Assistants after-tax pay, Illinois ranks #10 of 45 states — top quartile. High gross wages or low state-tax burden (or both) drive the strong ranking.
Translated into paycheck cadences, $50,597 net/year works out to $4,216/month or $1,946/bi-weekly for this Social Science Research Assistants in Illinois — the numbers that actually hit a checking account after every deduction.
Where does a Social Science Research Assistants keep the most of their paycheck? Top 10 states ranked by after-tax take-home pay.
Illinois ranks #10 out of 45 states for Social Science Research Assistants after-tax take-home pay.
A Social Science Research Assistants in Illinois earning a median salary of $64,890 will take home approximately $50,597 per year after federal income tax ($6,116), state income tax ($3,212), and FICA ($4,964). That is $4,216 per month or $1,946 per bi-weekly paycheck.
The effective total tax rate for a Social Science Research Assistants in Illinois is 22.0%, broken down as: federal income tax 9.4%, 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 Social Science Research Assistants's median salary of $64,890, the state income tax amounts to $3,212 per year, which is an effective state rate of 5.0%.
After all taxes, a Social Science Research Assistants in Illinois takes home approximately $4,216 per month, or about $24.33 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 $64,890 for Social Science Research Assistants 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 — $50,597/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