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. 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.Use this tool to get an EIN directly from the IRS in minutes for free. Applying online is the quickest alternative of receiving EIN from IRS. An EIN verification letter acts as official proof from the IRS that your business has been assigned an EIN. EIN Confirmation letter from IRS called CP 575, is issued to grant Federal Tax Id number known as Employer Identification Number (EIN). The IRS will generate the letter confirming your EIN's validity and send it to the business address on file. If you misplace your IRS EIN notice, you can request a replacementLetter 147C. The 147-C letter provides your Employer Identification Number.