1. What is the Illinois Salary Tax Calculator?

The Illinois Salary Tax Calculator estimates your total tax burden based on your annual salary, including federal income tax, Illinois state tax (flat 4.95%), and FICA (Social Security and Medicare) contributions.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• Federal Tax — Calculated using progressive tax brackets based on filing status
• Illinois State Tax — Flat 4.95% of income
• FICA — 6.2% Social Security (on first $147,000) + 1.45% Medicare (plus 0.9% additional Medicare tax for high earners)

3. Understanding Tax Components

Federal Tax: Progressive tax with rates from 10% to 37% based on income and filing status.

Illinois Tax: Flat 4.95% rate for all income levels.

FICA: Mandatory payroll taxes that fund Social Security and Medicare programs.

4. Using the Calculator

Tips: Enter your gross annual salary before taxes and select your filing status. The calculator will estimate your tax burden and net income.

5. Frequently Asked Questions (FAQ)

Q1: Why is Illinois state tax a flat rate?
A: Illinois has a flat income tax system where all taxpayers pay the same percentage regardless of income level.

Q2: Are there deductions not accounted for in this calculator?
A: Yes, this is a simplified calculator that doesn't account for itemized deductions, tax credits, or other adjustments.

Q3: What's the difference between the filing statuses?
A: Filing status affects your federal tax brackets and standard deduction. Married filing jointly typically has the most favorable rates.

Q4: Why does Social Security tax stop at $147,000?
A: This is the wage base limit for 2022. Earnings above this amount aren't subject to Social Security tax.

Q5: How accurate is this calculator?
A: It provides a good estimate but for precise calculations, consult a tax professional or use IRS-approved software.