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. Find out what you need to do if you have lost or misplaced your Employer Identification Number (EIN).This EIN confirmation letter is called CP 575, and the IRS only mails the letter to the mailing address listed on line 4 of the SS-4 application. This confirmation letter is known as Form CP 575 and is mailed to the address mentioned in your Form SS-4 application. Go to: pima.studentforms. Use this EIN and your name exactly as they appear at the top of this notice on all your federal tax forms. Fill out the cancellation notice at the bottom of the front page of the renewal form and return to us without payment. Search our website for available business names and resources to help you through the filing process. Search our website for available business names and resources to help you through the filing process. You'll receive your EIN immediately upon completing the online application, and the IRS will mail a formal letter with your EIN to keep in your records.