Illinois Quarterly Tax Calculator 2026
Illinois has a flat 4.95% income tax rate — one of the simplest state tax structures. Quarterly payments required if you expect to owe $500 or more.
Read our full Illinois freelancer tax guide →Quick Answer
Freelancers in Illinois pay federal self-employment tax (15.3% on net income), federal income tax, and 4.95% Illinois state income tax. Use the calculator below to estimate your quarterly payment.
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Tax Information Notice
This content is for informational and educational purposes only. It does not constitute tax, legal, or financial advice. Tax laws change frequently. Always consult a qualified CPA or Enrolled Agent for your specific situation.
Tax Information Notice
This content is for informational and educational purposes only. It does not constitute tax, legal, or financial advice. Tax laws change frequently. Always consult a qualified CPA or Enrolled Agent for your specific situation.