Self-Employment Tax Calculator for Illinois Freelancers (2026)
Illinois freelancers pay federal self-employment tax (15.3%) plus 5.0% Illinois state income tax on top.
Illinois Tax Overview for Freelancers
Federal SE Tax
15.3%
Illinois Income Tax
5.0%
SE Tax Deduction
50%
Standard Deduction
$15,700
Estimated Tax by Income — Illinois Freelancers (2026)
| Annual Income | SE Tax | Federal Tax | IL State Tax | Total Tax | Effective Rate |
|---|---|---|---|---|---|
| $30,000 | -$4,239 | -$1,223 | -$1,485 | -$6,947 | 23.2% |
| $50,000 | -$7,065 | -$3,454 | -$2,475 | -$12,994 | 26.0% |
| $75,000 | -$10,597 | -$6,794 | -$3,713 | -$21,104 | 28.1% |
| $100,000 | -$14,130 | -$11,906 | -$4,950 | -$30,986 | 31.0% |
| $150,000 | -$21,194 | -$22,536 | -$7,425 | -$51,155 | 34.1% |
* Single filer, standard deduction, no other income. For exact figures use the calculator below.
Calculate Your Exact Illinois Tax Bill
Enter your income and get a full breakdown including quarterly payment amounts.
Open Illinois Tax Calculator →Frequently Asked Questions — Illinois Freelancers
What is the self-employment tax rate in Illinois for 2026?
In Illinois, self-employed individuals pay the federal self-employment tax of 15.3% plus 5.0% Illinois state income tax on net earnings. After deductions, the effective combined rate for most freelancers falls between 18% and 20%.
Do Illinois freelancers need to pay quarterly estimated taxes?
Yes. If you expect to owe $1,000 or more in federal taxes for 2026, the IRS requires quarterly estimated payments. Illinois also requires quarterly state estimated tax payments if your state tax liability exceeds $500. Due dates: April 15, June 16, September 15, and January 15, 2027.
What business deductions can Illinois freelancers claim?
All standard federal deductions apply: home office, mileage (67 cents/mile in 2026), health insurance premiums, retirement contributions (up to $70,000 via Solo 401k), software, equipment, and professional development. These deductions reduce both your federal and Illinois state tax liability.