E-Verify (formerly the Basic Pilot/Employment Eligibility Verification Program) is an online system operated jointly by the Department of Homeland Security and the Social Security Administration (SSA). Participating employers can check the employment eligibility of new hires online by comparing information from an employee's Form I-9, Employment Eligibility Verification, against SSA and Department of Homeland Security databases. More than 141,000 employers are enrolled in the program, with over 7 million queries run through the system in fiscal year 2009 (as of August 8, 2009).

E-Verify is free and is the best means available for determining employment eligibility of new hires and the validity of their Social Security numbers.

E-Verify is a voluntary program for employers, with limited exceptions. Companies can access E-Verify online and compare an employee's Form I-9 information with over 444 million records in the SSA database, and more than 60 million records in Department of Homeland Security immigration databases. E-Verify is an essential tool for employers committed to maintaining a legal workforce, and the number of registered employers is growing by over 1,200 per week.

Federal contractors and subcontractors will be required to use E-Verify beginning September 8, 2009. Executive Order 12989 mandates the electronic verification of all employees working on any federal contract. The amended Executive Order reinforces the policy that the federal government supports a legal workforce.