Sole Proprietorship. Write to us at the address where you filed your return, informing the Internal Revenue Service (IRS) of the name change.Learn how to change your business name with the IRS. This file is a template for an IRS cover letter informing the IRS of a company name change. If you've changed your legal or business name, you might need to notify the IRS or the Social Security Administration (SSA). Before you complete this petition, read the Instructions for Filing a Petition for Change of Name (form NC100INFO). 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. A letter requesting the contact name change for your business account. As a result, there are great needs in the areas of parenting support, mental health services, and substance abuse prevention and treatment. Enter your ITIN in the spaces marked "Taxpayer identification number.