If you are filing a current year Form 1065, mark the appropriate name change box on the form: Page 1, Line G, Box 3. Learn how to change your business name with the IRS.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. 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. The first step is to file a form called the Certificate of Amendment with the Bureau of Corporations and wait for it to be approved. 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. Use Form 8822-B to notify the Internal.