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.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. Are you planning an IRS business name change? You may not need a new EIN. 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. An IRS LLC name change is perhaps the easiest one to perform. All you need to do is put down a name change statement on your company's tax return. Search for business topics like employer tax identification number (EIN) information, with the A-Z Index.