​What are the Quarterly Filing Requirements for Employers?

Employers must file wage reports (Form UI-3/40​) and pay contributions in the month after the close of each calendar quarter - that is, on or before April 30, July 31, October 31 and January 31. 

Although IDES sends quarterly tax packets to most employers, it is still an employer's responsibility to obtain the proper forms and file on time even if a packet is not received. Nonprofit and governmental organizations are also required to file wage reports, although they may reimburse IDES for benefits paid rather than making quarterly contributions. 

The department requires that employers use the forms and return mail envelope in the quarterly packet. However, in cases where this is not possible, mail completed forms and payments to:

IDES P.O. Box 19300
Springfield, Illinois 62794-9300 

For more IDES employer contact​ information, or call:
  • The Employer Services Hotline, at 800-247-4984
  • The Tax Hotline TTY number is 866-212-8831.​