Inputs
Example data
Click a row to load into the form.
| Scenario | Income | Pretax | Exemptions | Exemption each | IL subs | Rate % | Credits |
|---|---|---|---|---|---|---|---|
| Entry job | $30,000 | $1,500 | 1 | $2,775 | $0 | 4.95 | $0 |
| Dual income | $80,000 | $6,000 | 2 | $2,775 | $0 | 4.95 | $250 |
| High earner | $150,000 | $19,500 | 3 | $2,775 | $0 | 4.95 | $0 |
Results
Live- Taxable income$0.00
- State tax$0.00
- Effective rate0.00%
- Net pay after state tax$0.00
- Total deductions used$0.00
- Credits applied$0.00
| Metric | Amount ($) |
|---|---|
| Gross income | 0.00 |
| Pretax deductions | 0.00 |
| Illinois subtractions | 0.00 |
| Exemptions total | 0.00 |
| Taxable income | 0.00 |
| State tax before credits | 0.00 |
| Credits applied | 0.00 |
| Final state tax | 0.00 |
| Net pay after state tax | 0.00 |
| Effective tax rate | 0.00% |
Formula used
This tool applies a flat Illinois rate and your selected deductions and exemptions:
AGI = max(0, GrossIncome − PretaxDeductions)
ExemptionsTotal = ExemptionPerPerson × NumberOfExemptions
ILTaxableIncome = max(0, AGI − ExemptionsTotal − IllinoisSubtractions)
TaxBeforeCredits = ILTaxableIncome × (RatePercent ÷ 100)
FinalTax = max(0, TaxBeforeCredits − NonrefundableCredits)
EffectiveRate = FinalTax ÷ GrossIncome (if GrossIncome > 0)
NetPayAfterStateTax = GrossIncome − FinalTax
Note: Illinois uses a flat state rate. Local income taxes are generally not applied. Some incomes may be non taxable in Illinois. Treat outputs as estimates only.
How to use this calculator
- Enter your filing status and annual gross income.
- Add pretax deductions such as retirement and HSA contributions.
- Enter the exemption amount per person and number of exemptions.
- Provide any Illinois specific subtractions and credits you qualify for.
- Click Calculate to update the results table and chart.
- Use Download CSV or Download PDF to save your results.
FAQs
1) Does Illinois use graduated brackets?
No. The state rate is flat. Set the rate field to your current state rate.
2) What counts as Illinois subtractions?
Illinois allows certain subtractions from income such as some Social Security and retirement income. Enter qualifying amounts in the Illinois subtractions field.
3) How are exemptions handled?
Enter the exemption amount per person and the number of exemptions. The calculator multiplies them and subtracts from adjusted income.
4) Are credits refundable?
This tool treats credits as nonrefundable. It will not reduce tax below zero.
5) Is local income tax included?
Local income tax is typically not applied in Illinois. This tool does not add local income tax.
6) Is this legal or tax advice?
No. This calculator provides educational estimates. For personalized advice, consult a qualified professional.