Compare self-employment taxes vs employee taxes in Illinois. State income tax rate: 4.95% (flat). See the complete federal + state + SE tax breakdown.
Loading Illinois tax comparison...
Illinois has a constitutionally mandated flat tax rate of 4.95%. Simple to calculate for both W-2 and 1099 workers.
As a 1099 contractor in Illinois, you'll pay federal self-employment tax of 15.3% (on 92.35% of net earnings), federal income tax based on your bracket, and state income tax at the rates shown above. Use the calculator above to see your exact breakdown based on your income level and filing status.
Illinois's income tax rate is 4.95% (flat) with a top marginal rate of 4.95%. Illinois has a constitutionally mandated flat tax rate of 4.95%. Simple to calculate for both W-2 and 1099 workers.
Self-employment tax is a federal tax of 15.3% (12.4% Social Security + 2.9% Medicare) — it's the same regardless of which state you live in. In Illinois, you also pay state income tax of 4.95% (flat) on top of federal income tax and SE tax. The SE tax applies to 92.35% of your net self-employment earnings.
In Illinois, a 1099 contractor pays approximately 7.65% more in self-employment tax compared to a W-2 employee on the same gross income. However, 1099 contractors can deduct business expenses (home office, equipment, travel, health insurance) and half of SE tax from AGI. With Illinois's state tax rates up to 4.95%, planning is important. The right choice depends on your deductions, benefits needs, and career goals.
Yes. If you expect to owe $1,000+ in federal tax, you must make quarterly estimated payments (Form 1040-ES) by April 15, June 15, September 15, and January 15. Illinois also requires quarterly estimated state tax payments if you expect to owe state taxes.