Before the SECURE Act was enacted, a 401(k) plan was permitted to exclude employees who did not work 1000 or more hours in a 12-month period. The SECURE Act will impose a new requirement for 401(k) plans to include employees in 401(k) plans for salary deferral contribution purposes if the employees 1) are at least age 21, 2) not in an excluded class of employees and 3) complete at least 3 consecutive 12-month periods with at least 500 hours of service in each 12-month period.