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. Your tax ID number can be found on the confirmation letter the IRS gave you when you requested an EIN.Use this tool to get an EIN directly from the IRS in minutes for free. Once the IRS issues an EIN for your Florida LLC, you will receive your official approval, known as an EIN Confirmation Letter (CP 575). The simplest way to get a copy of an EIN verification letter is to call the IRS. Follow the below process to obtain a tax ID verification letter. To apply for an employer identification number, you should obtain Form SS-4 PDF and its instructions PDF. Pick the category that describes your business: finance, real estate, etc. Submit your application. Confirmation is required after submission.