Illinois · state tax planning

Illinois Income Tax Calculator

Estimate Illinois income tax using the 2026 4.95% rate and an optional personal exemption allowance.

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Enter your values and calculate to see the result.

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How this Illinois calculator works

Uses the 2026 Illinois 4.95% income-tax rate. The second field lets you enter the exemption amount applicable to your situation; the default is $2,925 based on 2026 withholding guidance. This is a planning estimate, not a return-preparation engine.

Official source

Verify current rules with the official state tax authority.

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How to use this calculator

  1. Set Illinois income before exemption (default 85000).
  2. Set Exemption amount (default 2925).
  3. Select Calculate to update the result. Reset restores the starting values.

Planning estimate only. Federal tax, payroll taxes, local taxes and state-specific credits or adjustments may change the final result.

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