If you are filing a current year Form 1065, mark the appropriate name change box on the form: Page 1, Line G, Box 3. Are you planning an IRS business name change?You may not need a new EIN. The namechange letter should clearly state that your business name has changed. Follow our stepbystep guide covering how to properly amend your business name, to stay compliant with all state and local laws. 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 letter to the IRS will vary depending on your type of business and should include your company's tax ID, address, and an explanation of the name change. You must to report business name changes to the IRS if your company already has an EIN.