Illinois

State Income Tax

4.95%

Flat Rate

Exempt

Social Security

2026-04-15

Filing Deadline

Flat

Structure

Full Tax Details

Has Income TaxYes

Tax StructureFlat Rate

Rate4.95%

Single Standard DeductionN/A

Married Standard DeductionN/A

Single Personal Exemption$2,850

Married Personal Exemption$5,700

Taxes Social SecurityExempt

Taxes Retirement IncomeExempt

Filing Deadline2026-04-15

Retirement Income Details

Most retirement and pension income is exempt from Illinois tax.

Official Payment Portal

Illinois Department of Revenue

Last verified: 2026-03-31 · Always consult a tax professional before making financial decisions.