Your deferred comp plan accepts both Roth after-tax and traditional before-tax contributions, providing you a great deal of flexibility for retirement savings. In addition, there are some limitations to NQDC plans compared with qualified retirement plans such as 401(k)s.An NQDC plan gives highly compensated employees the option to defer an unlimited amount of their income on both a pretax and tax deferred basis. Is deferred compensation (401(k), 457(b) plans) taxable? The Pennsylvania State Employees' Retirement System's Deferred Compensation Program is a governmental. Find general information about 401(k) plans, the tax advantages of sponsoring the plan and the types of plans available. A: In order to complete your enrollment in the 457(b) Plan, you must complete the applicable enrollment form along with a Deferred Compensation Agreement. Q:.