Early on for me I'm using Taxable (cost basis about 15%) and trying to manage MAGI as a single filer for ACA. It's making for pretty low withdrawal and it's possible I'll need to supplement my "annual" withdrawal sometime next year. Eventually, I'll start a SEPP but once I do I'm locking in what could be significant regular income for close to a decade so I'm "stalling" to see how the market does (extending or shortening my taxable WD period -I don't want to deplete it so I have flexibility later), how my expenses evolve (I'm still very early in my ER) and how much other income from fun jobs etc I get. Once I start the SEPP, it should cover most of my expenses and since I'll plan to use the RMD method the amount should increase with time since my portfolio will likely continue to grow in my younger years while my life expectancy decreases. SEPP will also help keep my TSP from becoming massive causing huge RMDs later in my retirement.
I don't think there is one best order that can apply to anyone and even for an individual there are many "good" options. Only with hindsight will we know what would have been optimal for the way our life and tax laws unfold.
I don't think there is one best order that can apply to anyone and even for an individual there are many "good" options. Only with hindsight will we know what would have been optimal for the way our life and tax laws unfold.