Illinois self-employment tax calculator
Estimate what self-employment costs you in Illinois: 15.3% SE tax on 92.35% of profit, 2026 federal income tax, the QBI deduction, and Illinois's 4.95% state income tax. The state rate is pre-filled — adjust it if your bracket differs.
Your numbers
What you'll owe
Estimated total tax
$14,710
≈ 24.5% of profit · set aside 25% of every deposit
What do you do? Tap one to tailor this.
Each quarterly payment
$3,677
Due ~Apr 15, Jun 15, Sep 15, Jan 15
- Net business profit
- $60,000
- Self-employment tax (15.3%)
- $8,478
- QBI deduction
- − $11,152
- Taxable income
- $29,209
- Federal income tax
- $3,262
- Illinois tax (estimate)
- $2,970
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Driving for work? Every 100 miles takes $72.50 off the profit you're taxed on.
Count my milesIllinois self-employed tax at a glance
| State income tax | 4.95% flat |
|---|---|
| Self-employment tax | 15.3% federal (12.4% Social Security + 2.9% Medicare) |
| Social Security wage base | $184,500 (2026) |
| Local income tax | No broad local income tax on business profit |
| Quarterly estimate dates | Federal and state: Apr 15, Jun 15, Sep 15, Jan 15 |
| Typical total rate on $100k profit | About 26.9% (~$26,865) |
What Illinois tax looks like at four profit levels
Single filer, standard deduction, 20% QBI deduction applied, Illinois rate of 4.95% included. Your own number depends on filing status and deductions — use the calculator above for that.
| Net profit | Self-employment tax | Federal income tax | Illinois tax | Total | Set aside monthly |
|---|---|---|---|---|---|
| $50,000 | $7,065 | $2,370 | $2,475 | $11,910 (23.8%) | $992 |
| $75,000 | $10,597 | $4,600 | $3,713 | $18,910 (25.2%) | $1,576 |
| $100,000 | $14,130 | $7,786 | $4,950 | $26,865 (26.9%) | $2,239 |
| $150,000 | $21,194 | $15,964 | $7,425 | $44,583 (29.7%) | $3,715 |
Self-employment tax in Illinois
Illinois applies a 4.95% flat rate; sole proprietors may also owe replacement tax if organized as an entity.
Illinois applies a flat 4.95% individual income tax on top of federal income tax and the 15.3% self-employment tax. The federal half never changes: 15.3% on 92.35% of net profit, then income tax on profit less half that SE tax, the standard deduction and up to 20% qualified business income.
The failure mode is cash, not arithmetic. Money lands, it gets spent, and the quarterly due date becomes a crisis. Hate Ledger moves the reserve out of reach the day each deposit clears, so the Illinois and federal bills are funded before you see the money.
Frequently asked questions
How much self-employment tax do you pay in Illinois?
Self-employment tax is federal: 15.3% on 92.35% of net profit, the same in Illinois as everywhere else. Illinois applies a flat 4.95% individual income tax on top of federal income tax and the 15.3% self-employment tax.
What is the total tax rate for self-employed people in Illinois?
Most Illinois self-employed filers land between 27% and 38% of net profit once federal income tax, the 15.3% SE tax and the 4.95% state rate are combined.
Do I file quarterly estimates in Illinois?
Yes — federal estimates when you expect to owe $1,000 or more, plus Illinois state estimates on roughly the same April, June, September and January schedule.
Are there local taxes on self-employment income in Illinois?
Illinois does not add a broad local income tax on self-employment earnings, so state and federal are the two layers to plan for.
Can an S-corp lower self-employment tax in Illinois?
It can, once profit is high enough. Payroll tax then applies only to a reasonable salary rather than all profit. Illinois state income tax still applies to the full amount, so the savings are federal.
Estimates only, using projected 2026 federal figures and state rates for planning. Not tax advice.
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