Last updated: 2025 BLS data · Page refreshed:
How much does a Hydrologic Technicians actually take home in Illinois?
5.0% flat rate — 20.8% effective total tax rateData: BLS OEWS 2025 + IRS/State Tax Brackets 2024 • Updated 2026-05-19
Detailed line-by-line tax calculation for a Hydrologic Technicians earning $52,870 in Illinois (single filer, standard deduction).
| Tax Component | Annual Amount | Effective Rate |
|---|---|---|
| Gross Salary (Median) | $52,870 | — |
| Federal Income Tax | -$4,360 | 8.2% |
| Illinois State Income Tax | -$2,617 | 5.0% |
| Social Security (OASDI) | -$3,277 | 6.2% |
| Medicare | -$766 | 1.5% |
| Total Taxes | -$11,022 | 20.8% |
| Take-Home Pay | $41,847 | 79.2% |
Take-home pay varies significantly across experience levels. Here is the after-tax breakdown for each salary percentile of Hydrologic Technicians in Illinois.
| Percentile | Gross Salary | Total Taxes | Take-Home Pay | Tax Rate |
|---|---|---|---|---|
| 10th Percentile (P10) | $52,870 | -$11,022 | $41,847 | 20.8% |
| 25th Percentile (P25) | $52,870 | -$11,022 | $41,847 | 20.8% |
| Median (P50) | $52,870 | -$11,022 | $41,847 | 20.8% |
| 75th Percentile (P75) | $55,330 | -$11,627 | $43,702 | 21.0% |
| 90th Percentile (P90) | $77,760 | -$18,745 | $59,014 | 24.1% |
After federal income tax ($4,360), state tax ($2,617), and FICA ($4,044), a Hydrologic Technicians in Illinois takes home $41,847 per year — or $3,487 per month. The effective tax rate of 20.8% is relatively low compared to the national range.
With an effective total rate of 20.8%, a Hydrologic Technicians in Illinois keeps $41,848 of $52,870 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 Hydrologic Technicians salary that contributes $2,617 to the 5.0% effective state-tax burden.
Federal tax on this Hydrologic Technicians salary is $4,360 (40%), but combined state ($2,617, 24%) + FICA ($4,045, 37%) make up the other 60% of the bill.
Moving this same Hydrologic Technicians salary to a zero-state-tax state would yield around $44,465 net — a gain of $2,617 (6.3%) per year versus Illinois.
Illinois sits near the bottom (#25 of 28) for Hydrologic Technicians after-tax earnings. Relocation, negotiation, or credential stacking typically show the clearest ROI in bottom-quartile states.
Translated into paycheck cadences, $41,848 net/year works out to $3,487/month or $1,610/bi-weekly for this Hydrologic Technicians in Illinois — the numbers that actually hit a checking account after every deduction.
Where does a Hydrologic Technicians keep the most of their paycheck? Top 10 states ranked by after-tax take-home pay.
Illinois ranks #25 out of 28 states for Hydrologic Technicians after-tax take-home pay.
A Hydrologic Technicians in Illinois earning a median salary of $52,870 will take home approximately $41,847 per year after federal income tax ($4,360), state income tax ($2,617), and FICA ($4,044). That is $3,487 per month or $1,609 per bi-weekly paycheck.
The effective total tax rate for a Hydrologic Technicians in Illinois is 20.8%, broken down as: federal income tax 8.2%, 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 Hydrologic Technicians's median salary of $52,870, the state income tax amounts to $2,617 per year, which is an effective state rate of 5.0%.
After all taxes, a Hydrologic Technicians in Illinois takes home approximately $3,487 per month, or about $20.12 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 $52,870 for Hydrologic Technicians 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 — $41,847/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