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Can a sole proprietor have an SSN or does he or she need an EIN?

A sole proprietor may have an SSN or an EIN. However, he or she must always furnish his or her individual name (on Name Line 1), regardless of whether he or she uses a SSN or an EIN. A sole proprietor may also provide a business name or Doing Business As (DBA) (on Name Line 2), but he or she must list his or her individual name first on the account with you.

For additional information see Publication 1281, Backup Withholding.