Recommended by IRS
Employer Identification NumberInformation about Employer Identification Numbers (EIN), also known as a Federal Tax Identification Number. An EIN is used to identify a business entity.
Apply for an Employer Identification Number (EIN) online
Information about how to apply online for an Employer Identification Number.
Do you need a new EIN?
Generally, businesses need a new EIN when their ownership or structure has changed.
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Legal advice issued by field attorneys: 2005-2007
These documents are prepared by field attorneys in the Office of Chief Counsel, reviewed by an Associate Office, and subsequently issued to field or service center campus employees of the Internal Revenue Service.
Legal Guidance (Authoritative)
Tax Professionals
Legal advice issued to program managers during 2012-2019
Legal advice signed by executives in the National Office of the Office of Chief Counsel and issued to Internal Revenue Service personnel who are national program executives and managers.
Legal Guidance (Authoritative)
Tax Professionals
The Truth About Frivolous Tax Arguments — Section I (D to E)
"The Truth About Frivolous Tax Arguments" addresses frivolous tax arguments in general. This document was updated March 2022
Legal Guidance (Authoritative)