IDES Employer Services Center fax number

Where Illinois employers fax the IDES Employer Services Center (MyTax Illinois, general tax information, refunds, SIDES registration).

Verified October 22, 2026Checked against Contact IDES (ides.illinois.gov).

IDES Employer Services Center fax number: which number to use
Who uses it	Office	Fax
Employers	IDES Employer Services Center	(217) 557-1948

Last verified October 22, 2026

Faxsure is not affiliated with Illinois Department of Employment Security or any government agency. We copy each number from the official source linked above; check it before you send.