How does the Illinois paycheck calculator work?
This calculator estimates your net take-home pay by subtracting the main payroll deductions from your gross income. Here's what it accounts for:
- Federal income tax — calculated using 2025 marginal tax brackets and the updated standard deduction ($15,750 single / $23,625 head of household / $31,500 married filing jointly, per the OBBB Act).
- Illinois state income tax — a flat rate of 4.95% on your Illinois base income, minus the IL personal exemption ($2,850 per person).
- Social Security (FICA) — 6.2% of wages up to the $176,100 cap.
- Medicare — 1.45% of all wages, plus an additional 0.9% on income above $200,000 (single / HoH) or $250,000 (married).
- Pre-tax deductions — optional 401(k) and HSA contributions that reduce your federal taxable income.
The result is then divided by your chosen pay frequency to show the per-paycheck amount. You can enter your salary as an annual amount or as an hourly wage.
💡 Tip: Illinois has no local income taxes — unlike New York or Ohio, you won't owe any city or county taxes.
Illinois paycheck tax breakdown
Here's a summary of each tax that comes out of your Illinois paycheck:
Federal Income Tax
10%–37%
Applied after standard deduction using marginal brackets
Illinois State Tax
4.95%
Flat rate on IL base income minus $2,850 exemption per person
Social Security
6.2%
On first $176,100 of wages (2025 wage base limit)
Medicare
1.45%+
On all wages, plus 0.9% above $200k/$250k
Local Taxes
0%
None in Illinois
2025 Federal income tax brackets
Federal income tax uses a progressive system — you pay a higher rate only on income within each bracket. Standard deductions updated per the OBBB Act (July 2025).
Standard deduction: $15,750
| Bracket | Rate |
|---|---|
| $0 – $11,925 | 10% |
| $11,925 – $48,475 | 12% |
| $48,475 – $103,350 | 22% |
| $103,350 – $197,300 | 24% |
| $197,300 – $250,525 | 32% |
| $250,525 – $626,350 | 35% |
| $626,350+ | 37% |
Example calculation
Let's walk through a single filer earning $75,000/year paid bi-weekly, with no 401(k) or HSA contributions:
- Federal standard deduction: $75,000 − $15,750 = $59,250 taxable income
- Federal tax: 10% on $11,925 + 12% on $36,550 + 22% on $10,775 = ≈ $7,943
- Illinois state tax: 4.95% × ($75,000 − $2,850 exemption) = $3,571
- FICA: (6.2% + 1.45%) × $75,000 = $5,738
Result: $75,000 − $17,252 = $57,748/year → ≈ $2,221 per paycheck (bi-weekly)
Marginal vs. effective tax rate
These are two different ways to describe your tax burden, and they're often confused:
Marginal rate
The tax rate applied to your last dollar of income. If you earn $75,000 (single), your marginal federal rate is 22% because the top portion of your income falls in the 22% bracket.
Effective rate
The average rate you actually pay across all brackets, calculated as total tax ÷ gross income. For the same $75,000 earner, the effective federal rate is about 10.6% — much lower than 22%.
This calculator shows your effective total tax rate (all taxes combined) next to the annual net figure. Your marginal rate matters most when evaluating a raise or bonus.
2024 vs. 2025: what changed?
Key differences affecting your Illinois paycheck:
Std. deduction (single)
Std. deduction (married)
SS wage base
IL state tax rate
IL personal exemption
The larger standard deduction (boosted by the OBBB Act) means slightly more take-home pay for most filers at the same salary compared to 2024.
FAQs
What is the Illinois state income tax rate?
Illinois has a flat income tax rate of 4.95%. Everyone pays the same percentage regardless of income.
Does Illinois have local income taxes?
No. Illinois does not impose any local, city, or county income taxes.
How much is taken out of my paycheck?
For $75,000, approximately 23–25% goes to taxes depending on filing status and deductions.
What is the 2025 Social Security wage base?
$176,100. You pay 6.2% up to this cap. Medicare (1.45%) has no cap.
What is the 2025 standard deduction?
After the OBBB Act (July 2025), it's $15,750 for single filers, $23,625 for head of household, and $31,500 for married filing jointly.
Does a 401(k) contribution reduce my taxes?
Yes. Traditional 401(k) contributions are pre-tax and reduce your federal taxable income (and FICA-exempt in most cases). Use the 401(k) field in the calculator to see the impact.
How accurate is this calculator?
Solid estimate using 2025 brackets, OBBB-updated standard deductions, IL personal exemptions, and Additional Medicare Tax. Does not account for itemized deductions, credits, or non-wage income.
How do I calculate my bi-weekly paycheck?
Divide annual take-home by 26. For $57,748 net → ≈ $2,221 per paycheck.