For the complete documentation index, see llms.txt
For the complete documentation index, see llms.txt
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What is a Tax ID or EIN (FEIN)?
Employer Identification Number (EIN), also known as the _Federal Employer Identification Number_ (FEIN) or the _Federal Tax Identification Number_ , is a unique nine-digit number assigned by the [Internal Revenue Service](https://www.irs.gov/businesses/employer-identification-number "Internal Revenue Service") (IRS) to business entities operating in the United States for the purposes of identification.
