27 CFR 17.23 - Application for employer identification number.
(a) Use Form SS-4. A claimant must obtain an employer identification number (EIN) by filing an application with the Internal Revenue Service (IRS) on IRS Form SS-4. Form SS-4 is available from the local IRS Service Center, from the IRS District Director, the IRS Web site at http://www.irs.gov or from the TTB National Revenue Center. The claimant must file this form with IRS in accordance with the instructions on the form.