IL Income Tax Calculator
US, 2026 tax year · figures follow that year's rules
Il income tax calculator works out State income tax and Tax from the rate schedule from Income subject to state tax, What the income figure is and Filing status. The default figures on this page give state income tax of 4,062.71 USD; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
5 steps
- Illinois (tax year 2026): Illinois starts from federal AGI with Illinois additions and subtractions.
- Income 85000 less deduction 0 and exemptions 2925 = taxable income 82075
- Exemptions: 2925 for the taxpayer(s)
- 4.95% on 82075 (0 to and above) = 4062.71
- Total state and local tax = 4062.71
Tax by brackettable
| ratePercent | from | to | incomeInBand | tax |
|---|---|---|---|---|
| 4.95 | 0 | and above | 82,075 | 4,062.71 |
Figures from US state income tax tables, 2026 rules, checked 5 September 2026. Its 8 worked examples are re-run on every release, last on 15 September 2026. What changed · how reference data is kept current
Sources and references
23 sources
Keep this result
Save it, change one figure, then compare the two
The calculation stays free. Save this scenario, adjust one assumption, save that too, and put them side by side to see exactly what the change costs you. A free account keeps 5 scenarios and 2 comparisons; Personal makes both unlimited and adds exports and private links. Nothing is saved unless you press Save.
What the il income tax calculator calculates
Computes state individual income tax from the state's own rate schedule - the 2026 schedule where the state has published it, otherwise the 2025 schedule with a note saying so - including its standard deduction, personal exemptions and exemption credits, plus New York City resident tax or a local flat rate.
How to use this il income tax calculator
Enter Income subject to state tax, What the income figure is, Filing status and Dependents claimed. State income tax updates as you type. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind State income tax, Tax from the rate schedule and State taxable income.
The method follows Franchise Tax Board, 2025 California Tax Rate Schedules, NY Department of Taxation and Finance, Form IT-201-I (2025) rate schedules for New York State and New York City, New Jersey Division of Taxation, 2025 NJ-1040 Tax Rate Schedules, Virginia Department of Taxation, 2025 Form 760 instructions and Oregon Department of Revenue, Publication OR-17 (2025).
What you can compare
Change one input at a time to see how it affects State income tax, Tax from the rate schedule and State taxable income. The inputs you can vary are Income subject to state tax, What the income figure is, Filing status, Dependents claimed, State itemized deductions and Local income tax.
Understanding State income tax, Tax from the rate schedule and State taxable income
An estimate from each state's published rate schedule. State credits, add-backs, part-year and non-resident apportionment, and local taxes other than New York City are not modelled. Check your state return or a tax professional before relying on it.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How can I calculate my state income tax?
Computes state individual income tax from the state's own rate schedule - the 2026 schedule where the state has published it, otherwise the 2025 schedule with a note saying so - including its standard deduction. Open “How this is worked out” beside the result to see each step for your own figures.
What is the IL income tax rate?
On the figures this page opens with — income subject to state tax 125,000 USD — the state income tax is 4,062.71 USD. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
What information do I need for the il income tax calculator?
You need Income subject to state tax, What the income figure is, Filing status, Dependents claimed, State itemized deductions, Local income tax, Local income tax rate and Custom state rate. The page opens with default figures that give state income tax of 4,062.71 USD, so you can see the scale before entering your own.
What does this il income tax calculator show?
It shows State income tax, Tax from the rate schedule, State taxable income, Deduction applied, Exemptions applied, Exemption credits, Additional state levy and Local income tax, with the working and any warnings for your entries.
Can I check how the il income tax calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.