Illinois State Tax Guide 2025
Living in Illinois comes with specific tax obligations. Unlike states with no income tax (like Texas or Florida), Illinois requires residents to file a state return in addition to their federal taxes.
This calculator estimates your specific liability for Illinois, accounting for the unique tax laws, standard deductions, and tax rates applicable for the 2025 tax year.
How Illinois Taxes Your Income
Most states follow the federal adjusted gross income (AGI) as a starting point, but they apply their own deductions and credits.
- Resident Status: Full-year residents are taxed on all income. Part-year residents are typically taxed only on income earned while living in the state.
- Deductions: Illinois may offer a standard deduction different from the federal one.
It is important to check if you qualify for state-specific credits, such as renter's credits or child tax credits, which this simple estimator might not cover.