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.Are you planning an IRS business name change? You may not need a new EIN. 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. If you've changed your legal or business name, you might need to notify the IRS or the Social Security Administration (SSA). You don't have to mail a special letter to the IRS to change your LLC name. Applicants must be owned and operating from a physical location in the County. The bank account business name must match the business name the IRS has on file.