How do I determine which employees are considered "assigned to a contract" that contains the FAR E-Verify clause?

Employees are only considered assigned to a contract if they are directly performing work under the federal contract. An employee is not considered to be directly performing work under the contract if the employee normally performs support work, such as indirect or overhead functions, and does not perform any substantial duties under the contract. E-Verify is not able to make this determination for you. For more information, consult your legal counsel and/or contracting official.