Use this tool to get an EIN directly from the IRS in minutes for free. The only two ways to get an EIN Verification Letter (147C) is to call the IRS at 1-800-829-4933, or to mail the IRS a written request.The hours of operation are 7 a.m. Once the IRS issues an EIN for your North Carolina LLC, you will receive your official approval, known as an EIN Confirmation Letter (CP 575). The information below will help you register your business for the following account types listed on Form NC-BR: Withholding, Sales and Use. The IRS issues the EIN. This confirmation letter is known as Form CP 575 and is mailed to the address mentioned in your Form SS-4 application. How to Contact the IRS for EIN Verification Letter? Employers will receive a PIN number in the mail after an account number has been assigned. Complete the Form SS-4, Application for Employer Identification Number, which is available on the IRS Website.