The completed form must be returned to the IRS for verification and processing. To receive verification, mail back the completed forms and a copy of your bank statement showing the payment of this form (including your name, street address, and phone number) to the following address: U.S. Bankruptcy Court: 1501 North Clark Street, Suite 1605, Chicago, IL 60606. Note: You must send these letters during regular business hours, Monday through Friday, 8 a.m. to 5:00 p.m. W9 Form: IRS.gov: W9 Form: Form 945/947 at IRS.gov: W9 Form: Form 940 at IRS.gov: W9 Form: W9 | Illinois.gov w9: Illinois.gov's online W9 form | Illinois.gov (click on “W9” and follow prompts) IRS W9 Form — Request for Taxpayer Identification Number and certification — Docket No. 12 – 2015. Taxpayer.