Here is a list of the most requested forms that we have put together for you.   Internal Revenue Service: Change of address Taxpayer regarding refund Application of Employer Identification Form SS-4 Form W-9 Form W-7   State of California: Change of Address (California) Form 3533 Collection Information Statement Form (State) Power of Attorney (State) Form Power of Attorney (EDD) Form California Seller's Permit Application Form 433B – Collection Information Statement for Business   County: Los Angeles County DBA filings San Bernardino County DBA filings Orange County DBA filings Copyright © 2010 Turcios Inc. English | Spanish IRS.gov Franchise Tax Board Refund Advantage 1513 West 6th. Street Los Angeles, CA, 90017 Tel: (213) 483-3090 Fax: (213) 483-8485 Where is my Refund? Directions Address Business Hours Monday to Friday 9:00 a.m. - 7:30 p.m. Saturday and Sunday 9:00 a.m. - 6:00 p.m. TAX FORMS