Freelance Taxes in Illinois: Complete 2026 Guide
Rates reviewed · Source: Illinois Department of Revenue
Illinois has a flat income tax rate of 4.95% on all income — one of the simplest state tax structures.
Quarterly Estimated Payments
IL requires quarterly estimated payments if you expect to owe $500 or more.
| Quarter | Income period | Due |
|---|---|---|
| Q1 | Jan 1 – Mar 31, 2026 | April 15, 2026 |
| Q2 | Apr 1 – May 31, 2026 | June 16, 2026 |
| Q3 | Jun 1 – Aug 31, 2026 | September 15, 2026 |
| Q4 | Sep 1 – Dec 31, 2026 | January 15, 2027 |
MyTax Illinois — Illinois Department of Revenue · Form IL-1040-ES · How to pay online
Key Tax Facts for Illinois Freelancers
- •Simple flat tax rate — no brackets to navigate
- •Chicago residents may owe additional city taxes
- •Illinois follows federal quarterly payment schedule
- •Personal property replacement tax applies to S-Corps at 1.5%
Deductions in Illinois
Illinois generally does not conform to federal itemized deductions. The state has its own standard exemption system.
Top Freelancer Cities in Illinois
Illinois freelance tax questions
How much tax do freelancers pay in Illinois?
Three taxes apply: 15.3% federal self-employment tax on net earnings up to $184,500, federal income tax at your bracket, and Illinois income tax of 4.95% flat. Illinois has a flat income tax rate of 4.95% on all income — one of the simplest state tax structures.
Do Illinois freelancers have to make quarterly estimated payments?
IL requires quarterly estimated payments if you expect to owe $500 or more. Federal estimated payments for 2026 are due Q1 April 15, 2026, Q2 June 16, 2026, Q3 September 15, 2026, Q4 January 15, 2027. Illinois follows the same schedule.
What can Illinois freelancers deduct?
Illinois generally does not conform to federal itemized deductions. The state has its own standard exemption system.
Where do Illinois freelancers pay estimated taxes online?
Illinois accepts online estimated tax payments through MyTax Illinois, operated by the Illinois Department of Revenue. The state estimated tax form is Form IL-1040-ES. Federal payments are made separately through IRS Direct Pay or EFTPS.
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.