Sole Proprietorship. Write to us at the address where you filed your return, informing the Internal Revenue Service (IRS) of the name change.Enter your LLC's current name. (Not the name you're changing it to.) There is a change in the name of the limited liability company to:. If you've changed your legal or business name, you might need to notify the IRS or the Social Security Administration (SSA). To fill out this form, you need to provide the old and new company names, your federal identification number, and contact details. Sending a written request to enroll in Direct Deposit to the local Railroad Retirement Board field office. File form TC-69C, Notice of Change for a Tax Account, or notify the Tax Commission in writing. These steps thoroughly break down the LLC formation process in the Beehive State. Step 1: Choose your business name.