Illinois Self-Employment Tax Calculator 2026
Illinois has a flat income tax rate of 5.0%. Use this calculator to estimate your total tax liability including federal self-employment tax, federal income tax, and Illinois state income tax.
Your 2026 Tax Estimate — Illinois
Total Tax
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Take Home
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Effective Rate
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Quarterly Payment
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Tax Breakdown
Quarterly Estimated Tax Schedule
Self-Employment Tax in Illinois (IL)
If you're self-employed in Illinois, you'll pay three types of tax on your 1099 income: federal self-employment tax (15.3%), federal income tax (10-37% depending on your bracket), and Illinois state income tax. Illinois has a flat income tax rate of 5.0%.
Important note: Illinois has a flat income tax rate with a personal exemption.
How Self-Employment Tax Works
The federal self-employment tax rate is 15.3% — covering both Social Security (12.4%) and Medicare (2.9%). This is calculated on 92.35% of your net self-employment earnings. For 2026, Social Security tax applies to earnings up to $176,100. You can deduct half of your SE tax when calculating your federal income tax, which reduces your overall tax burden.
Other States
No Income Tax States
Illinois Tax Quick Facts
- Income Tax
- Yes
- Tax Type
- flat
- Rate
- 4.95%
- Federal SE Tax
- 15.3%