December 06, 2018 21:17 Updated Follow Your retirement date with PERF or TRF is the official date that we calculate your benefits and is always the first day of the month following your last day of work. It does not refer to your last day of work or the day you mail your application. Related articles At what age should I retire? I'm a vested TRF member. How can I receive an online retirement benefit estimate? When do I get my retirement benefit? What should I do while my PERF or TRF retirement application is being processed? What is service credit?