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Taxpayer identification numbers (TIN) - Internal Revenue Service
Individual taxpayer identification number (ITIN)
Employer identification number | Internal Revenue Service
U.S. taxpayer identification number requirement
ITIN application frequently asked questions - Internal Revenue …
Get an employer identification number | Internal Revenue Service
How to apply for an ITIN | Internal Revenue Service
Taxpayer identification number (TIN) matching tools
Tax Tip: Employer Identification Number (EIN) - TAS
Individual Taxpayer Identification Number - IRS tax forms