If you are filing a current year Form 1065, mark the appropriate name change box on the form: Page 1, Line G, Box 3. In order to change your LLC name with the IRS, you'll need to mail them a letter and show proof of the state approving your LLC name change.The first step is to file a form called the Articles of Amendment with the Secretary of State and wait for it to be approved. How do I fill this out? To fill out this form, you need to provide the old and new company names, your federal identification number, and contact details. Use Form 8822-B to notify the Internal. Revenue Service if you changed your business mailing address, your business location, or the identity of your. The IRS asks that you send a letter, on company letterhead (if available) providing the name and Social Security Number of the owner(s) of the LLC.