Illinois Tax Calculator
The Illinois (IL) Tax Calculator is updated for the 2026/27 tax year. Illinois applies a flat-rate state income tax. This tool estimates your Illinois state tax alongside federal income tax, Social Security, and Medicare to show projected take-home pay.
Quick Access Tools
Quick Illinois Tax Calculator
Enter income and filing status, then select Calculate for instant results. Use tabs to add itemized deductions, dependents, retirement deferrals, and withholdings. Illinois has no local wage income tax; leave Local Taxes off unless modeling a custom scenario.
Input key: F Used in Federal tax calculations S Used in State tax calculations
How to Calculate Income Tax in Illinois for 2026/27
- Enter your gross annual income and any adjustments.
- Choose your filing status (Single, Married filing jointly, etc.).
- Click Calculate to view Illinois state tax, federal taxes, FICA/Medicare, and take-home pay.
Advanced Options
- Compare itemized deductions with the federal standard deduction.
- Model IRA/401(k) deferrals and other pre-tax benefits.
- Add dependents to reflect child-related credits.
- Enter withholdings (federal, state, Medicare, Social Security) to project refund or balance due.
Related Calculators
Common Illinois Forms & Schedules
Browse the essential Illinois (IL) tax forms used for personal and business income tax filing. Common examples include Form IL-1040 (Individual Income Tax Return) and Schedule M (Other Additions and Subtractions), along with credits, withholding, and estimated payment schedules supporting Illinois taxpayers.
- Illinois Form IL 1040 Individual Income Tax Return
- Illinois Form IL 1040 Schedule G Voluntary Charitable Donations
- Illinois Form IL 1040 Schedule M Additions and Subtractions
- Illinois Form IL 1040 Schedule NR Nonresident and Part-Year Resident
- Illinois Form IL 1040 Schedule ICR Illinois Credits
- Illinois Form IL 1040 Schedule CR Credit for Tax Paid to Other States
- Illinois Form IL 1040 Schedule IL E EITC Earned Income Credit
- Illinois Form IL 1040 X Amended Individual Income Tax Return
- Illinois Form IL 1040 Schedule 1299 A Tax Subtraction and Credit Summary
- Illinois Form IL 4562 Depreciation and Amortization Adjustments
- Illinois Form IL 1299 C Tax Credit Recapture Schedule
Additional Resources
- All State Calculators
- Federal and State Tax Tables
- Federal Income Tax Calculator
- Report an issue or request a correction
Frequently Asked Questions
Quick answers for Illinois filers: flat-rate state tax, federal coordination, deductions, dependents, and withholdings.
Mortgage vs take-home planning
Try the Mortgage Calculator and revisit this IL page.
Where do I mail the completed IL-1040-V and payment?
Mail the completed voucher and payment to the address printed on the voucher (Illinois Department of Revenue, Springfield IL 62726-0001) unless told otherwise during filing.
Do charitable gifts affect IL tax?
IL doesn’t mirror federal itemized deductions; charitable gifts matter federally, not typically for IL base.
Why don’t my payroll brackets match?
Employer systems use rounding/timing and supplemental methods; small variances are normal.
Does Illinois tax Social Security or pension income?
No. Illinois exempts most retirement income—including Social Security, pensions, and IRA withdrawals—from state income tax. These subtractions are reported on Schedule M.
Important Notes
All calculations are estimates for guidance only. Always review your return and consider professional advice when submitting official filings.