Illinois does not offer a state standard deduction in 2026. Instead of a flat deduction, Illinois taxes income under its own rules (often a flat rate or personal-exemption system), so state taxable income is calculated differently than the federal standard-deduction approach.
Illinois does not use a federal-style standard deduction for 2026. Depending on the state, income may be taxed at a flat rate with no deduction, or reduced through personal exemptions or credits instead. The result is that Illinois taxable income is computed from its own rules rather than by subtracting a flat standard deduction.
Illinois does not provide a state standard deduction for 2026; it calculates state taxable income using flat-rate or personal-exemption rules instead.
Note: 2026 figures are estimates from SAWD's tax engine. Verify current amounts with the Illinois Department of Revenue before filing.
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