Illinois state taxes on your paycheck
Illinois uses a flat income tax rate of 4.95% on taxable wages, applied after federal calculations. Combined with FICA deductions, your Illinois paycheck is straightforward to estimate.
Federal deductions every Illinois worker pays
Regardless of state, the federal layer is identical nationwide: 2026 brackets from 10% to 37%, standard deduction of $16,100 (single), $32,200 (married filing jointly), or $24,150 (head of household), Social Security at 6.2% up to $184,500 in wages, and Medicare at 1.45% with an additional 0.9% above $200K.
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