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. To get the 147C letter, call the IRS Business and Specialty Tax Line at 8008294933 and ask.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. To get an EIN application, complete Form SS4, Application for Employer Identification Number. Find out what you need to do if you have lost or misplaced your Employer Identification Number (EIN). You can apply online, via fax, or through the mail. If you are an international applicant, you can apply over the phone. The Internal Revenue Service will mail you a confirmation letter within 8 to 10 weeks after approval of your EIN application. An IRS Verification of Nonfiling Letter will provide proof from the IRS that there is no record of a filed tax form for the year you have requested. To apply for an EIN from the IRS: • Mail or fax Form SS-4, Application for Employer Identification.