Call, write or email a company to obtain its state employer identification number, which is issued by the Internal Revenue Service, recommends the Houston Chronicle. Employers who lost their employer identification numbers, or EINs, may contact the IRS by calling 800-829-4933.
Another way to find an EIN is to visit the Search for Charities page on the official website of the IRS, click Search Now and complete the form that requires information about the employer, istates the Houston Chronicle. To verify an employer's EIN, use the services of a tax adviser or an online EIN database provider. Most providers charge a fee for confirming the information of an employer using the employer's EIN. Some websites also allow users to search EINs for free.