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Employer identification number | Internal Revenue Service
Taxpayer identification numbers (TIN) - Internal Revenue Service
Lost or misplaced your EIN? | Internal Revenue Service
Individual taxpayer identification number (ITIN)
Tax Tip: Employer Identification Number (EIN) - TAS
Get an employer identification number | Internal Revenue Service
Businesses - Internal Revenue Service
Tools | Internal Revenue Service
Online EIN: Frequently asked questions - Internal Revenue Service
Taxpayer identification number (TIN) matching tools