# Employer Identification Number (EIN)

Written by [Bonita Fowlersmith](https://help.shippabo.com/authors/1290282)

Updated at May 14th, 2025

An Employer Identification Number (EIN) is a tax identification number assigned by the U.S. Internal Revenue Service (IRS) to identify business entities in the United States. The EIN is also used by U.S. Customs & Border Protection (CBP) to link businesses to their import or export activities, including customs bonds, customs entries, and ISF filings.

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