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What Is an Employee Identification Number (EIN)?

By Motley Fool StaffUpdated Dec 13, 2025 at 5:43 PM

Key Points

  • EIN serves as a unique identifier for businesses, similar to an individual's SSN.
  • Businesses, especially with employees or those needing to file certain taxes, must obtain an EIN.
  • Applying for an EIN online through the IRS is immediate, other methods may take four weeks.

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