The Deferred Compensation Plan ; And it's as easy as 1-2-3. This SRA is required to enroll in a voluntary Tax Deferred Account (TDA).The Employee and an authorized representative of. Submit your forms as follows: 1) Inquries and questions can be sent via email to the Plan. Do you know how much you can contribute to your employer's 457(b) retirement plan in the current year? This calculator can help you understand your options. Collin County offers three 457(b) retirement savings options that allow you to save pre-tax money for retirement.