The common rule for the employees are any employee must have completed the age limit of 21 and have one-year experience in the service. Normally the one-year experience is calculated as calendar year or any 12 months time or it should be 1000 hours.
The 401K plans in require two-year eligibility condition; grant the complete and direct power is granted on admission. 401K plans give eligibility for more than one year of services.
The date decided in 401k plans properly documented so that who will take part in 401K plans, depend on approval of eligibility need. If one-year eligibility is used, there must be at least two entry dates.
The Employee Benefits Security Administration, the U.S. Department of Labor defines the proper criteria, which define criteria for the employee. The company must obey the rules of the 401K plans to give the protection of the employee as 401K plan carried out by the companies.