Gross salary to net pay for Illinois: 2026 federal brackets, Social Security and Medicare, and Illinois state income tax (Flat 4.95%).
HSA and health premiums (cafeteria plan) skip income tax and FICA; 401(k) skips federal income tax.
Illinois does not tax most retirement income, including 401(k) and pension withdrawals.
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Illinois applies a single flat income tax rate of 4.95% to all taxable income, after subtracting a personal exemption (about $2,925 per person). There are no graduated brackets and no standard deduction. This calculator subtracts the exemption, applies the flat rate, then adds federal tax and FICA. Notably, Illinois does not tax most retirement income.
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Illinois has a flat 4.95% income tax that applies to every dollar of taxable income, regardless of how much you earn.
No. Illinois has no standard deduction, but it does allow a personal exemption of roughly $2,925 per filer that reduces taxable income before the flat rate applies.
Pre-tax 401(k) contributions reduce Illinois taxable income, and Illinois does not tax most retirement withdrawals, making it relatively retiree-friendly.