Deferred compensation plans tend to offer better investment options than most 401(k) plans, but are at a disadvantage regarding liquidity. 401(k)s and 457(b)s are both taxdeferred retirement plans.In addition, there are some limitations to NQDC plans compared with qualified retirement plans such as 401(k)s. The maximum you can contribute is up to 100 percent of includible compensation. A 457(b) plan is a tax-deferred retirement savings plan. Funds are withdrawn from an employee's income without being taxed and are only taxed upon withdrawal.