Scam Alert: Fake Texts and Websites Impersonating IDOR

Be alert for fraudulent messages or websites attempting to steal your banking information, login credentials, or credit card details. The Illinois Department of Revenue (IDOR) will never request personal or financial information via text message. To confirm official communications or contact details, always visit https://tax.illinois.gov.

Freedom Of Information

What is FOIA?

FOIA is an acronym for Freedom of Information Act. Under the Illinois Freedom of Information Act (5 ILCS 140/1, et seq.), records in the possession of public agencies may be accessed by the public upon written request. Pursuant to 5 ILCS 140/2(c), "public records" means all records, reports, forms, writings, letters, memoranda, books, papers, maps, photographs, cards, tapes, recordings, electronic data processing records, recorded information and all other documentary materials, regardless of physical form or characteristics, having been prepared, or having been or being used, received, possessed or under the control of any public body. Records that are not subject to release under FOIA include confidential taxpayer and tax return information.

How Do I Submit a FOIA Request?

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Department Overview

Brief Description/Summary of Purpose

The Illinois Department of Revenue (IDOR) is the tax collection agency for the State of Illinois and also administers a number of taxes imposed by local governments. The $70.1 billion collected by the department in FY25 accounts for virtually all of Illinois' own source revenue and is used to provide public safety, health, educational and human services to Illinois citizens.

IDOR's operations are divided into six primary areas: Account Processing, Taxpayer Services, Tax Enforcement and Collections, Audit Bureau, Legal Services, and Administrative Services. The taxes collected come from three key sources: (1) Illinois Income Tax; (2) Retailers' Occupation Tax and Use Tax (commonly referred to as sales tax); and (3) excise taxes, including taxes on liquor, cigarettes, public utilities, hotel occupancy, and motor fuel. The department's central office is located in Springfield, with five additional regional offices, including an office location in downtown Chicago.

IDOR processes approximately 6.3 million individual income tax returns and 2.34 million business income tax and withholding income tax returns annually. Approximately 65% filing individual income tax returns for the 2024 filing period filed in 2025 received refunds. An estimated 91.3% of all individual income tax returns are now filed electronically.