Tarrant County offers an optional tax-deferred retirement savings program called Deferred Compensation (457(b) plan). Find general information about 401(k) plans, the tax advantages of sponsoring the plan and the types of plans available.Leave your money in your 401(k) or 457 program as is. Use online tools to create a retirement plan. What are 401(k) plans? TMRS is a statewide retirement system that provides retirement, disability, and survivor benefits for employees of participating Texas cities. A 401(k) plan is a company-sponsored retirement account in which employees can contribute a percentage of their income. To keep your money in your TCDRS account, all you have to do is keep your account information up-to-date with us. Once you have money in a Roth IRA, however, there are no RMDs in your or your spouse's lifetimes. Two Opportunities to Save for Retirement!