Estimate annual net pay from a gross salary in Illinois after taxes and deductions.
Converts a gross salary in Illinois to estimated take-home: deductions for FICA plus simplified federal and state income tax. Pre-tax benefits lower taxable income but your contributions still come out of the gross.
Net
Net = gross − FICA − federal − state (on taxable income)
Approximate estimate — not official payroll.
Your W-4, pre-tax benefits (health, 401k) and local taxes change withholding.
Rates are approximate reference values. Local rates, exemptions and rules can differ, so treat the output as a planning figure only.