Illinois Income Tax & Sales Tax Calculator
Use this tool to estimate your Illinois state income tax and combined sales tax. Figures are estimates for planning only.
1) Illinois State Income Tax Estimate
2) Illinois Sales Tax Estimate
How Illinois tax rates work
If you are looking for an Illinois tax rate calculator, the first thing to know is that Illinois handles different taxes in different ways. For personal income tax, Illinois uses a flat state income tax rate rather than multiple tax brackets. For sales tax, the rate is a combination of a statewide base rate plus local add-ons set by city, county, and special districts.
This page gives you a practical way to estimate both. The calculator above is useful for budgeting, paycheck planning, and understanding how tax changes can affect your take-home money.
Illinois state income tax (flat rate)
Illinois currently applies a flat income tax rate of 4.95% to taxable income. That means your marginal state rate does not step up through multiple state brackets. In simple terms, taxable income multiplied by 4.95% gives your baseline state tax before credits.
Illinois sales tax (state + local)
Illinois has a statewide sales tax base rate of 6.25% on many general purchases. Local governments can add additional percentages, so your total rate may be higher depending on where you buy.
- State base sales tax: 6.25%
- Local sales tax: varies by location
- Combined rate: state + local
How to use this Illinois tax rate calculator
For income tax
- Enter annual gross income.
- Enter pre-tax deductions (retirement, HSA, etc. if applicable).
- Set your number of exemptions and exemption value.
- Add any expected Illinois tax credits.
- Click Calculate Income Tax to view estimated taxable income, tax before credits, final tax, and effective rate.
For sales tax
- Enter the taxable purchase amount.
- Enter your local sales tax rate percentage.
- The calculator adds the 6.25% Illinois state rate to your local rate and estimates tax owed.
Example Illinois tax estimate
Suppose your annual gross income is $90,000, pre-tax deductions are $6,000, and you claim two exemptions at $2,775 each. Your taxable income estimate would be:
$90,000 - $6,000 - ($2,775 × 2) = $78,450 taxable income
Estimated state income tax before credits:
$78,450 × 4.95% = $3,883.28
If you have $200 in Illinois credits, estimated state tax becomes $3,683.28.
Ways to lower your Illinois tax burden
- Contribute to pre-tax retirement plans when eligible.
- Track deductible expenses and tax-eligible credits carefully.
- Review paycheck withholding annually to avoid large surprises.
- Keep records for property-tax-related and education-related credits if applicable.
- For major purchases, compare local sales tax rates across nearby jurisdictions when practical.
FAQ: Illinois tax rate calculator
Does Illinois have local income tax?
Illinois generally does not impose local (city/county) income tax for most wage earners. State income tax is applied at the state level.
Is Illinois a progressive income tax state?
No. Illinois uses a flat personal income tax rate rather than progressive state brackets.
Are these estimates exact?
No. This tool is for planning and education. Real tax returns can differ based on filing details, law changes, credits, and special rules. For filing decisions, consult official Illinois Department of Revenue guidance or a licensed tax professional.