Illinois State Tax Calculator 2026
Estimate your Illinois state income tax and take-home pay for tax year 2026.
Last updated: November 2025 · Source
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Illinois 2026 tax overview
Constitutional flat 4.95%; no std deduction. Personal exemption ~$2,925 phases out at high income.
Breakdown
Frequently Asked Questions
What are the 2026 Illinois income tax rates?
Illinois has a flat 4.95% rate on taxable income. Constitutional flat 4.95%; no std deduction. Personal exemption ~$2,925 phases out at high income.
What is the 2026 Illinois standard deduction?
For 2026, Illinois allows a state standard deduction of $0 for single filers and $0 for married filing jointly.
Does Illinois tax Social Security benefits?
Tax treatment of Social Security varies by state. Illinois's rules can change year-to-year, check the Illinois Department of Revenue for the most current guidance.
What is the difference between federal and Illinois state income tax?
Federal tax is collected by the IRS at uniform rates nationwide (10%-37%). Illinois state tax is separate, with its own brackets and rules. Total income tax burden = federal + state combined.