July 24, 2017 18:45 Updated Follow To participate, you must be eligible to retire and immediately begin receiving unreduced retirement benefits on the date you enter the DROP. Related articles What is the DROP? How do I begin participating in the DROP? Is there a limit on how much money I can make after retirement if I return to a PERF- or TRF-covered position? What new services from INPRS are available in 2018? When can I retire from PERF or TRF?