July 22, 2017 11:42 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 When can I retire from PERF or TRF? If my last day of work is January 1, when is my retirement date? How do I retire from PERF or TRF (video)? At what age should I retire? When should I start thinking about planning for retirement?