Last updated: 2025 BLS data · Page refreshed:
How much does a Network and Computer Systems Administrators 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 Network and Computer Systems Administrators earning $100,080 in Illinois (single filer, standard deduction).
| Tax Component | Annual Amount | Effective Rate |
|---|---|---|
| Gross Salary (Median) | $100,080 | — |
| Federal Income Tax | -$13,858 | 13.8% |
| Illinois State Income Tax | -$4,953 | 5.0% |
| Social Security (OASDI) | -$6,204 | 6.2% |
| Medicare | -$1,451 | 1.5% |
| Total Taxes | -$26,468 | 26.4% |
| Take-Home Pay | $73,611 | 73.6% |
Take-home pay varies significantly across experience levels. Here is the after-tax breakdown for each salary percentile of Network and Computer Systems Administrators in Illinois.
| Percentile | Gross Salary | Total Taxes | Take-Home Pay | Tax Rate |
|---|---|---|---|---|
| 10th Percentile (P10) | $65,650 | -$14,555 | $51,094 | 22.2% |
| 25th Percentile (P25) | $79,520 | -$19,354 | $60,165 | 24.3% |
| Median (P50) | $100,080 | -$26,468 | $73,611 | 26.4% |
| 75th Percentile (P75) | $128,790 | -$36,675 | $92,114 | 28.5% |
| 90th Percentile (P90) | $157,800 | -$47,293 | $110,506 | 30.0% |
After federal income tax ($13,858), state tax ($4,953), and FICA ($7,656), a Network and Computer Systems Administrators in Illinois takes home $73,611 per year — or $6,134 per month. The effective tax rate of 26.4% is moderate compared to the national range.
A Network and Computer Systems Administrators in Illinois loses 26.4% of gross pay to taxes — higher than the ~25% national midpoint. Of the $100,080 gross, $73,611 lands in the paycheck after federal ($13,859), state ($4,954), and FICA ($7,656) withholding.
Illinois applies a flat state income tax — every dollar of wage income is taxed at the same rate. For this Network and Computer Systems Administrators salary that contributes $4,954 to the 5.0% effective state-tax burden.
Federal tax on this Network and Computer Systems Administrators salary is $13,859 (52%), but combined state ($4,954, 19%) + FICA ($7,656, 29%) make up the other 48% of the bill.
Moving this same Network and Computer Systems Administrators salary to a zero-state-tax state would yield around $78,565 net — a gain of $4,954 (6.7%) per year versus Illinois.
Illinois ranks #18 of 51 states for Network and Computer Systems Administrators after-tax pay — comfortably in the upper half.
Translated into paycheck cadences, $73,611 net/year works out to $6,134/month or $2,831/bi-weekly for this Network and Computer Systems Administrators in Illinois — the numbers that actually hit a checking account after every deduction.
Where does a Network and Computer Systems Administrators keep the most of their paycheck? Top 10 states ranked by after-tax take-home pay.
Illinois ranks #18 out of 51 states for Network and Computer Systems Administrators after-tax take-home pay.
A Network and Computer Systems Administrators in Illinois earning a median salary of $100,080 will take home approximately $73,611 per year after federal income tax ($13,858), state income tax ($4,953), and FICA ($7,656). That is $6,134 per month or $2,831 per bi-weekly paycheck.
The effective total tax rate for a Network and Computer Systems Administrators 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 Network and Computer Systems Administrators's median salary of $100,080, the state income tax amounts to $4,953 per year, which is an effective state rate of 5.0%.
After all taxes, a Network and Computer Systems Administrators in Illinois takes home approximately $6,134 per month, or about $35.39 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 $100,080 for Network and Computer Systems Administrators 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 — $73,611/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