If you are filing a current year Form 1065, mark the appropriate name change box on the form: Page 1, Line G, Box 3. If you sell, close, or discontinue business operations within Los Angeles, you must notify the City of Los Angeles, Office of Finance.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 simplest way is to wait until filing the organization's 990 and note the change of name or address in the actual form. Form 8822B is for businesses and other entities with an Employer Identification Number application on file. You don't have to mail a special letter to the IRS to change your LLC name. If you've changed your legal or business name, you might need to notify the IRS or the Social Security Administration (SSA). The landlord does not fill out this form.