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What Is a W-9 Form?

By Catherine Brock – Updated Jun 2, 2025 at 11:15AM

Key Points

  • Form W-9 is needed when earning non-employment income for tax reporting purposes.
  • A proper W-9 must include TIN, your name, tax classification, and address, signed under oath.
  • Provide W-9 forms safely by hand or mail to avoid exposure of sensitive details like your TIN.
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