Illinois Income Tax Calculator
Calculate your 2026 Illinois state income tax. See your bracket breakdown, effective rate, and how Illinois compares to neighboring states.
Your Tax Inputs
Effective Rate vs Neighboring States
Illinois Tax Brackets (2026)
Federal vs Illinois Tax Comparison
Estimate for your income and filing status. Federal uses 2026 brackets and standard deduction.
| Item | Federal | Illinois | Total |
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About Illinois state taxes (Tax year 2026)
Illinois has a flat income tax rate of 4.95% on all taxable income. The Illinois Constitution requires a flat rate. Illinois does not offer a standard deduction but provides a personal exemption of $2,625.
Groceries are taxed at a reduced rate of 1%. Prescription drugs are exempt.
Illinois's 4.95% flat rate is near the national average, but its combined sales tax rate of 8.82% is among the highest in the nation.
Filing in Illinois: returns for tax year 2026 are administered by the Illinois Department of Revenue and are generally filed in 2027 by the federal April deadline unless Illinois declares a state-specific extension. Tax type on this return: Flat. Top marginal rate: 4.95%. State sales-tax rate: 6.25%. For the most current contact info, see the Federation of Tax Administrators directory.
Illinois — What is Illinois's income tax rate? Illinois has a flat income tax rate of 4.95% on all taxable income. The state constitution mandates a flat rate structure.
Illinois — Does Illinois tax groceries? Illinois taxes groceries at a reduced rate of 1%, compared to the full 6.25% state rate on other goods.
Illinois — Does Illinois have a standard deduction? No, Illinois does not offer a standard deduction. Instead, it provides a personal exemption of $2,625 per person.
How this page is reviewed
| Risk tier | High YMYL |
|---|---|
| Author | Calculover Editorial Team Tax education |
| Editorial owner | Calculover Tax & Payroll Desk State-tax methodology owner |
| Reviewer | Calculover Editorial Review Government-source and limitation review |
| Last reviewed | 2026-05-14 |
| Last verified | 2026-05-14 |
| Data effective date | 2026-01-01 |
| Jurisdiction | Illinois |
Methodology
State-tax per-state pages apply the published 2026 bracket schedule, standard deduction, and filing-status rules for the listed jurisdiction. Federal AGI inputs are mapped to state taxable income before bracket math runs. Local taxes (NYC, Philadelphia, certain Ohio cities) are flagged but not embedded in the base estimate.
Assumptions
- The user enters federal AGI, filing status, and state-specific adjustments as provided.
- Brackets, standard deductions, and credits reflect the 2026 statutory values published by the state Department of Revenue and the Tax Foundation.
- Local income taxes and reciprocity-agreement situations are noted but not auto-applied.
Limitations
- These pages do not predict mid-year legislative changes, rate adjustments, or new local tax assessments.
- Multi-state filers, convenience-of-employer rules, and special-circumstance credits require additional tax-professional analysis.
Sources
- State Tax Rates, Federation of Tax Administrators
- State Individual Income Tax Rates and Brackets, Tax Foundation
- State Government Resources, Internal Revenue Service
Professional guidance: This page is for state-tax education only and is not tax, legal, financial, or investment advice. State tax decisions and multi-state filing should be reviewed with a CPA or enrolled agent licensed in the relevant states.