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Illinois Self-Employment Tax Calculator
Estimate your 2026 1099 self-employment tax, Illinois state and federal income tax, and your quarterly set-aside.
On $75,000 of net 1099 profit, a single filer in Illinois with no W-2 income owes about $20,407 in 2026 self-employment and income tax — $10,597 self-employment tax, $6,504 federal income tax, and $3,305 Illinois state income tax — or about $5,102 set aside every quarter.
Income after business expenses, not gross revenue.
Set aside each quarter
per quarter, for 2026
Effective rate
27.2%
Recommended set-aside
30%
This calculator estimates 2026 federal self-employment tax, federal income tax, and state income tax on net 1099/Schedule C profit. State tax uses single-filer brackets regardless of the filing status selected above, and approximates each state's taxable income as profit minus the federal standard deduction rather than that state's own deductions — so the state figure is directional, not a liability estimate, especially for married filers and states with different deduction rules (e.g. Pennsylvania, which has no standard deduction). It also does not model the QBI deduction (which would lower income tax for many filers), tax credits, or state estimated-payment rules. Consult a tax professional for personalized advice.
2026 federal tables from IRS Rev. Proc. 2025-32; Illinois rates from the state's revenue department and statutes (2026 rates; brackets, standard deduction and exemptions from the latest published state tables, 2025 where the state has not released 2026 figures); quarterly due dates and the underpayment safe harbor from irs.gov. Reviewed by Junead Khan. Last updated .
$75,000 of 1099 profit in Illinois
Flat 4.95%
Tax by profit level
Single filer, no W-2 income, Illinois.
| Net profit | Total annual tax | Set aside | Per quarter |
|---|---|---|---|
| $25,000 | $5,251 | 25% | $1,313 |
| $50,000 | $12,616 | 30% | $3,154 |
| $75,000 | $20,407 | 30% | $5,102 |
| $100,000 | $30,201 | 35% | $7,550 |
| $150,000 | $50,141 | 35% | $12,535 |
1099 vs W-2, same pay
$75,000 gross, single filer, Illinois.
1099 self-employed
Total tax
$20,407
After-tax profit
$54,593
Pays the full 15.3% self-employment tax — both the employee and employer share of Social Security and Medicare.
W-2 employee
Total tax
$16,975
After-tax pay
$58,025
Pays only the $5,738 employee half of FICA (7.65%); an employer would pay a matching amount on top of the $75,000 salary, at no cost to the employee's paycheck.
Illinois self-employment tax questions.
About 30% of net profit, based on a single filer with no other income. $75,000 of 1099 profit works out to roughly $20,407 a year — $5,102 a quarter — in self-employment tax, federal income tax, and state income tax.
15.3% of 92.35% of your net self-employment income: 12.4% for Social Security (up to the annual wage base) and 2.9% for Medicare (no cap), plus an additional 0.9% Medicare surtax above $200,000 (single or head of household), $250,000 (married filing jointly), or $125,000 (married filing separately). This applies in every state, including Illinois — it is a federal tax.
Four payments: April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027, per the IRS estimated-tax schedule — pay each one in full as it comes due. If you started earning partway through 2026, the quarters before your income started can still trigger an underpayment penalty, but Form 2210's annualized income installment method (Schedule AI) can reduce or eliminate it for income received unevenly across the year.
Yes. Illinois applies a flat 4.95% rate to income after deductions — this estimate subtracts the federal standard deduction and half of self-employment tax before applying Illinois's rate, using single-filer brackets regardless of filing status — in addition to federal self-employment and income tax.
Estimates use 2026 federal and state tax rates on net profit after business expenses. State tax always uses single-filer brackets and approximates the state taxable-income base as profit minus the federal standard deduction, rather than modeling each state's own deductions and filing-status-specific brackets — so the state figure is directional, not a liability estimate, especially for married filers or states whose rules differ from the federal standard deduction (e.g. Pennsylvania, which has none). It also does not model the QBI deduction (which would lower income tax for many filers), tax credits, retirement contributions, or state-specific estimated-payment rules.
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