How Do You Find a Company's Tax ID Number?

company-s-tax-id-number Credit: Joe Raedle/Getty Images News/Getty Images

Company tax identification numbers are procured from the Internal Revenue Service, public company documents or fee-based resources such as Lexis or Westlaw. The IRS issues, stores and maintains all employer tax identification numbers in the United States. However, the IRS requires authorization from the underlying company to receive the tax ID number.

  1. Contact the IRS if you are an authorized employee

    If authorized, contact the IRS’s Business & Specialty Tax Line at 800-829-4933. Provide identifying information to affirm permission, including your name, location and Social Security Number. After authorizing your credentials, the employer tax identification number are provided over the phone.

  2. Search a company's public filings

    If you are searching for the tax ID number of a public company, visit the “Filings” section on the SEC (Securities and Exchange Commission) website. Conduct a search for the company and download the first page of their 10-K or 20-F filing. Public companies are required by law to print their employer tax ID number on these documents.

  3. Use a fee-based resource

    Procuring tax ID numbers for private companies or non-profit organizations typically require a third party. Before purchasing a service such as Lexis or Westlaw, visit the company’s website and search for any financial or tax-related document. For non-profit organizations, search for the IRS Form 990, which provides the tax ID number along with financial information and executive names.