Illinois Department of Employment Security fax numbers
Each number below is copied from an official Illinois Department of Employment Security page or form, with a link to the source and the date we verified it.
- IDES Employer Services Center fax number
Where Illinois employers fax the IDES Employer Services Center (MyTax Illinois, general tax information, refunds, SIDES registration).
- IDES Employer Services Center (217) 557-1948
Verified October 22, 2026
- IDES fraud and identity theft fax number
Where to fax the Illinois Department of Employment Security to report unemployment fraud or identity theft.
- IDES fraud and identity theft (312) 793-2356
Verified October 22, 2026
- IDES tax withholding fax number (TAX-2 form)
Where to fax the IDES TAX-2 form to change federal or state tax withholding on your current Illinois unemployment claim.
- IDES 24-hour tax withholding fax line (630) 495-8199
Verified October 22, 2026
- Illinois new hire reporting fax number (IDES)
Where Illinois employers fax new hire reports to IDES.
- IDES New Hire Reporting (217) 557-1947
Verified October 22, 2026
Faxsure is not affiliated with Illinois Department of Employment Security or any government agency. Each page links to the official source we copied the number from; check it before you send.