Illinois withholds state income tax at a flat 4.95% rate. For a single filer using a standard W-4 with no 401(k) contributions, here is the complete 2026 breakdown for a $90,000 salary.
2026 Tax Breakdown — $90,000 Salary, Single, Illinois
| Tax | Annual | Per biweekly paycheck |
|---|---|---|
| Gross pay | $90,000 | $3,461.54 |
| Federal income tax | −$10,970 | −$422 |
| Social Security | −$5,580 | −$215 |
| Medicare | −$1,305 | −$50 |
| Illinois state income tax (4.95% flat) | −$4,455 | −$171 |
| Estimated net take-home | ≈ $67,690 | ≈ $2,603 |
Figures assume single filing status, standard 2026 W-4, no 401(k) or pre-tax deductions. Federal withholding from IRS Pub 15-T 2026. Illinois withholding from IL-700-T.
Federal Income Tax
Federal withholding is approximately $10,970 per year (about $422 per biweekly paycheck).
FICA Taxes
- Social Security: 6.2% = $5,580/year ($215 per biweekly paycheck)
- Medicare: 1.45% = $1,305/year ($50 per biweekly paycheck)
Illinois State Income Tax
Illinois uses a flat 4.95% withholding rate. For this default-path estimate, state income tax is approximately $4,455 per year ($171 per biweekly paycheck).
Calculate Your Exact Take-Home
Your actual take-home depends on your W-4 elections, Illinois withholding allowances, pre-tax contributions, and any supplemental income. Use the calculator for a personalized breakdown.
See your exact Illinois take-home — including 401(k) and HSA impact.
Calculate your exact Illinois take-home →Frequently Asked Questions
What is the Illinois income tax rate?
Illinois has a flat income tax rate of 4.95% for 2026, meaning all taxable income is withheld at the same rate regardless of how much you earn.
How much is $90,000 biweekly in Illinois after taxes?
Approximately $2,603 per biweekly paycheck after federal, FICA, and Illinois state income tax for a single filer in 2026.
Is Illinois a high-tax state?
Illinois has a moderate flat income tax rate of 4.95%. However, property taxes in Illinois are among the highest in the US.
Estimates based on 2026 IRS Publication 15-T and Illinois IL-700-T withholding tables. Not tax advice. Consult a CPA.
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