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The Employer Identification Number, also known as the Federal Employer Identification Number or the Federal Tax Identification Number, is a unique nine-digit number assigned by the Internal Revenue Service to business entities operating in the United States for the purposes of identification. When the number is used for identification rather than employment tax reporting, it is usually referred to as a Taxpayer Identification Number, and when used for the purposes of reporting employment taxes,
By Robert Longley. To set up a federal tax ID number (also called an Employer Identification Number, or EIN), contact your nearest Local IRS Field Office, or call the IRS Business and Specialty Tax Hotline at 800-829-4933.You can also apply online for an EIN via the IRS web site.hare. By Robert Longley. To set up a federal tax ID number (also called an Employer Identification Number, or EIN), contact your nearest Local IRS Field Office, or call the IRS Business and Specialty Tax Hotline at 800-829-4933. You can also apply online for an EIN via the IRS web site.