2021 Illinois income-tax brackets.
OfficialFlat 4.95% of Illinois net income under the rate in force since July 1, 2017. Illinois modifications, exemptions and credits apply. The 2027 entry is current enacted law as of October 2, 2026, subject to later amendments.
Single
| Taxable income | Rate |
|---|---|
| $0 | 4.950% |
Married filing jointly
| Taxable income | Rate |
|---|---|
| $0 | 4.950% |
Head of household
| Taxable income | Rate |
|---|---|
| $0 | 4.950% |
Married filing separately
| Taxable income | Rate |
|---|---|
| $0 | 4.950% |
- Illinois Department of Revenue income tax ratesIndividual income tax: 4.95%, effective July 1, 2017
Retrieved 2026-10-02. Values and source snapshots are versioned. How we verify them.
Compare a year.
Use the year links to compare the same filing status. State taxable income, deductions and credits differ from federal rules. These rate tables do not compute a complete state return.
| Year | Highest single ordinary-income rate | Status |
|---|---|---|
| 2021 | 4.950% | Official |
| 2022 | 4.950% | Official |
| 2023 | 4.950% | Official |
| 2024 | 4.950% | Official |
| 2025 | 4.950% | Official |
| 2026 | 4.950% | Official |
| 2027 | 4.950% | Official |
Questions about the state schedule.
Is this the state withholding table?
These schedules describe ordinary personal income rates. Withholding methods can differ from annual return calculations.
Does this include city taxes or special taxes?
No. Local taxes, capital-gains taxes, surcharges and high-income recapture can require additional calculations. Read the state-specific note and linked primary source.
Does a zero rate mean no taxes?
A state without an ordinary personal income tax can still levy sales, property, business or other taxes.
Where can I calculate an actual state return?
Use the linked state revenue department’s forms or a qualified preparer for deductions, credits and special calculations.