Illinois Tax Tables for 2017
The 2017 Illinois Tax Tables summarise the state-level rules applied to wages, deductions, credits and taxable income. These tables match the rules used by the Illinois State Tax Calculator 2017.
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Illinois Tax Tables for 2017
The tables below outline the income tax structure, deduction amounts, state-level credits and payroll-related rules used for Illinois in 2017. Illinois applies a flat income tax to this filing status. All taxable income is taxed at the same rate, with no marginal brackets. This table shows the single rate used in calculations. To understand how flat tax tables differ from progressive systems, see our Tax Tables guide.
Single – Flat Income Tax (2017)
A single flat tax rate applies to all taxable income for Single filers.
| Bracket | Range | Rate |
|---|---|---|
| 1 | 0 and over | 4.95% |
Married filing jointly – Flat Income Tax (2017)
A single flat tax rate applies to all taxable income for Married filing jointly filers.
| Bracket | Range | Rate |
|---|---|---|
| 1 | 0 and over | 4.95% |
Married filing separately – Flat Income Tax (2017)
A single flat tax rate applies to all taxable income for Married filing separately filers.
| Bracket | Range | Rate |
|---|---|---|
| 1 | 0 and over | 4.95% |
Head of household – Flat Income Tax (2017)
A single flat tax rate applies to all taxable income for Head of household filers.
| Bracket | Range | Rate |
|---|---|---|
| 1 | 0 and over | 4.95% |
Widowed – Flat Income Tax (2017)
A single flat tax rate applies to all taxable income for Widowed filers.
| Bracket | Range | Rate |
|---|---|---|
| 1 | 0 and over | 4.95% |
Illinois Standard Deduction(2017)
State-level standard deduction amounts for each filing status.
| Filing Status | Amount |
|---|---|
| Single | $0 |
| Married filing jointly | $0 |
| Married filing separately | $0 |
| Head of household | $0 |
| Widowed | $0 |
Illinois Tax Tables for Related Years
These related years are often reviewed together for comparing bracket changes, deductions and Illinois updates:
Frequently Asked Questions
529 plan deduction (Bright Start/Bright Directions)?
Illinois allows a state deduction for contributions to its 529 plans (limits apply).
Can I amend to claim missed credits or deductions?
Yes. You may file IL-1040-X to add credits such as the Illinois Credits (Schedule ICR) or education expense credit you forgot to claim originally.
How can I verify that my donation reached the fund I chose?
After the filing season, each state agency receiving contributions issues a public report confirming the total received from taxpayers. You can also contact the Illinois Department of Revenue or the administering agency for that specific fund for confirmation. Keep a copy of your return and any receipt from your tax preparer or e-file provider showing your donation entry.
I paid tax to another state—can I avoid double taxation?
Yes. File Schedule CR to claim a credit for income tax paid to another U.S. state on the same income while an IL resident.
Why is Schedule 1299-C important for transparency?
It maintains fairness within Illinois’s incentive programs. By recapturing credits when eligibility changes, the state ensures that incentives reward long-term economic activity rather than short-term gains. For taxpayers, it preserves credibility and helps avoid legal disputes with the Department of Revenue.
Important Notes
All calculations are estimates for guidance only. Always review your return and consider professional advice when submitting official filings.