As a condition of enrollment in the tax-sheltered annuity plan, a Salary Reduction Agreement shall be entered into by the eligible employee and the employer. Such agreements shall commence only at the beginning of a calendar quarter, except 10-month employees of boards of education may enroll as of September 1. In each case, an employee must be enrolled in a State-administered retirement system prior to enrolling in the Supplemental Annuity Collective Trust.
N.J. Admin. Code § 17:8-2.3