🏛️ Illinois Paycheck Calculator
Calculate your Illinois net take-home pay after state income tax (4.95% flat rate), federal income tax withholding, Social Security, Medicare, and all pre-tax and post-tax deductions. Instant, accurate results for every pay frequency.
How to Use This Illinois Paycheck Calculator
Four steps to calculate your exact Illinois net take-home pay with every deduction shown.
Enter Gross Income
Input your gross pay per period and select your pay frequency — weekly, bi-weekly, semi-monthly, monthly, or annual. For hourly workers, switch to hourly mode and enter your rate and hours.
Set Filing Status
Choose Single, Married Filing Jointly, or Head of Household from your W-4. Add any W-4 Step 3 child tax credits and any extra withholding from Step 4(c).
Add Deductions
Enter your pre-tax deductions (401k, health insurance, HSA, FSA) which reduce your taxable income, and any post-tax deductions (Roth 401k, life insurance, other garnishments).
View Full Breakdown
See your Illinois net take-home pay with every deduction itemised — federal tax, Illinois 4.95% flat state tax, Social Security, Medicare, and all your deductions shown per-period and annually.
2024 Federal Income Tax Brackets — Used in This Calculator
Federal income tax uses graduated brackets. Illinois uses a flat 4.95% on all taxable income regardless of income level.
| Rate | Single / MFS Taxable Income | Married Filing Jointly | Head of Household |
|---|---|---|---|
| 10% | $0 – $11,600 | $0 – $23,200 | $0 – $16,550 |
| 12% | $11,601 – $47,150 | $23,201 – $94,300 | $16,551 – $63,100 |
| 22% | $47,151 – $100,525 | $94,301 – $201,050 | $63,101 – $100,500 |
| 24% | $100,526 – $191,950 | $201,051 – $383,900 | $100,501 – $191,950 |
| 32% | $191,951 – $243,725 | $383,901 – $487,450 | $191,951 – $243,700 |
| 35% | $243,726 – $609,350 | $487,451 – $731,200 | $243,701 – $609,350 |
| 37% | Over $609,350 | Over $731,200 | Over $609,350 |
Illinois flat state income tax rate: 4.95% on all taxable income. Social Security: 6.2% on wages up to $168,600 (2024). Medicare: 1.45% on all wages (+ 0.9% on wages above $200,000 single / $250,000 MFJ).
Illinois Income Tax — What You Need to Know
Illinois has one of the simplest state income tax structures in the United States — a flat 4.95% rate applied to all taxable income regardless of how much you earn. This means a worker earning $30,000/year and one earning $300,000/year both pay exactly 4.95% of their Illinois taxable income to the state. This rate has been in place since July 2017 (previously 3.75%).
Illinois taxable income starts with federal adjusted gross income (AGI) with minor modifications — Illinois does not have a personal exemption but does allow deductions for certain retirement income. Importantly, Illinois does not tax Social Security benefits, pension income from government jobs, or most retirement account distributions, making it relatively retirement-friendly.
Your federal withholding depends on your W-4 filing status and the 2024 tax brackets. The standard deduction for 2024 is $14,600 (single) and $29,200 (married jointly). Pre-tax deductions like 401(k) contributions and health insurance premiums reduce both federal and Illinois taxable income, making them especially valuable.
- Illinois flat rate: 4.95% — same percentage regardless of income level
- Social Security not taxed by Illinois (saving up to 4.95% on SS income)
- Government pension and most retirement distributions exempt from IL tax
- Pre-tax 401(k) contributions reduce both federal AND Illinois taxable income
- 2024 SS wage base: $168,600 — no SS tax on wages above this amount
- Additional Medicare tax 0.9% applies on wages over $200,000 (single filer)
💰 Maximize Your Illinois Take-Home Pay
The most powerful tool for Illinois workers is maximising pre-tax deductions. Every dollar contributed to a traditional 401(k) saves you 4.95% in Illinois state tax plus your marginal federal rate. For a worker in the 22% federal bracket, each $1,000 of 401(k) contribution saves $269.50 in taxes ($220 federal + $49.50 IL). The 2024 401(k) contribution limit is $23,000 ($30,500 if age 50+). Health insurance premiums paid through a Section 125 cafeteria plan are also exempt from both federal income tax, Illinois income tax, and FICA — making employer-sponsored health insurance extremely tax-efficient.
🏛️ Illinois vs Other States
Illinois's 4.95% flat rate compares favourably to some states but is higher than others. States like California (up to 13.3%), New York (up to 10.9%), and New Jersey (up to 10.75%) have much higher top rates. However, states like Texas, Florida, Nevada, and Washington have no state income tax at all. Illinois ranks around #22 in state income tax burden nationally. The flat structure means high earners pay the same rate as low earners — unlike progressive state taxes in California or New York.
📋 Understanding Your W-4 (2020+)
The 2020 redesigned W-4 no longer uses "allowances." Instead: Step 1 is your filing status. Step 2 accounts for multiple jobs or a working spouse (check the box or use the estimator). Step 3 is for child tax credits — enter $2,000 per qualifying child under 17 and $500 for other dependents. Step 4(b) allows you to claim additional deductions beyond the standard deduction. Step 4(c) lets you request extra withholding per period. Accurate W-4 completion prevents a large tax bill or refund at year-end.
📊 FICA Taxes Explained
FICA (Federal Insurance Contributions Act) taxes fund Social Security and Medicare. Social Security is 6.2% of wages up to the annual wage base ($168,600 in 2024) — once your wages exceed this, you stop paying SS for the rest of the year. Medicare is 1.45% on all wages with no cap, plus an Additional Medicare Tax of 0.9% on wages above $200,000 (single) or $250,000 (married). Your employer matches your FICA contributions — so the total FICA cost to your employer is 15.3% of your wages up to the SS wage base.
Illinois Paycheck Calculator FAQs
Common questions about Illinois income tax, FICA deductions, pre-tax benefits, and take-home pay.
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About This Illinois Paycheck Calculator
This Illinois paycheck calculator uses the 2024 IRS Publication 15-T percentage method withholding tables for federal income tax, applied using the annualised wage method. Standard deductions used: $14,600 (Single/MFS), $29,200 (Married Filing Jointly), $21,900 (Head of Household). Illinois state income tax is calculated at the flat 4.95% rate on gross wages minus qualifying pre-tax deductions. Social Security is 6.2% on wages up to the 2024 wage base of $168,600. Medicare is 1.45% on all wages plus 0.9% on wages exceeding $200,000 (single) / $250,000 (MFJ) annually. Pre-tax deductions (401k, health, HSA, FSA) reduce federal and Illinois taxable income; HSA and Section 125 health premiums also reduce FICA. Results are for informational and planning purposes only — actual withholding may vary. Consult a tax professional for personalised tax advice. This tool is not affiliated with the Illinois Department of Revenue or the IRS.
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