Employees and suppliers generally look up the Employer Identification Number, or EIN, of an employer to verify the company, organization, or local or sate government agency, according to the Houston Chronicle. The tax ID number serves as a reference number that helps employees find information about a business or organization.
Employees can find an employer's EIN by checking their W2 form, states the Houston Chronicle. A good way to search for a publicly traded firm's EIN is to visit the company's Investor Relations website and view the Securities and Exchange Commission filing document on the filings page. Those who want to find EIN numbers regularly may use an online commercial database service. Some commercial EIN information providers allow new users to make a few searches for free.