Cook County offers a Section 457 deferred compensation plan as a tax-deferred method for you to save for retirement. You will need your Social Security Number and PIN to enroll in the Plan online.A voluntary retirement savings plan that provides quality investment options, investment educational programs and related services. Please schedule a local office in-person appointment or call us at 1-855-457-2665. Please call 855-457-2665 for assistance. Beneficiary Information. If you would like to confirm or update your beneficiary information, please visit our website at CookCountyDC. Some deferred compensation contracts provide that benefits are payable immediately if an employee dies or becomes disabled during the eligibility period. If there are multiple beneficiaries, each must complete a copy of this form. Not all options are available for non-spousal beneficiaries.