The URS 457(b) allows you to contribute pre-tax dollars that grow tax-deferred until they're withdrawn. Fill in the short plan year beginning and ending dates in the space provided and check the appropriate box in Part I, line B, of the.Filing tips, notices, updates of filing requirements, and other helpful material to assist you in preparing your Form 5500 (Form 5500-EZ). This plan allows eligible employees to: Set aside money towards their retirement. Make Roth contributions that can grow tax-free. Supplementary Financial. Supporting Schedules: Individual Retirement Systems'. 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 Funds are withdrawn from an employee's income without being taxed and are only taxed upon withdrawal.