What is actually different about an FRS retirement
Most retirement income planning assumes a pile of money and a withdrawal rate. That is not your situation.
You have a pension paying a fixed monthly amount for life, possibly with no COLA at all, if your service is post-2011. You may have a DROP accumulation arriving as a single event. You have a 457(b) or 403(b). Maybe an IRA or Roth. And Social Security, whenever you decide to start it.
Five sources, different tax treatment, different timing, different permanence. The planning question is not how much to withdraw. It is what to draw from, in what order, and in which year.
If your money is in the Investment Plan, there is no pension paying a fixed amount for life. The account pays nothing until you draw from it. So here the question does include how much to withdraw, along with what to draw from, in what order, and in which year.
