Yes, the conventional drawdown priority is taxable, tax-deferred and tax-free and IMO it is hard to go wrong with that, especially if it is supplemented by Roth conversions from tax-deferred to tax-free as your tax situation allows at a lower tax cost than later when you are colecting pensions, SS and RMDs.
Another option if taxable is in appreciated equities and retirement is very well funded is to leave taxable alone, withdraw from Roth and then do Roth conversions from tax-deferred as tax situation allows to refill the tax-free. The play is that heirs get a stepped-up basis when you die so a hope that taxes on those unrealized gains never happen (assuming that stepped up basis is still around).
I have been looking at my own situation and came to my own conclusion that the second option was for me. Before starting a thread just to see if there were any gotchas I didn't consider, I did a search and found this thread from last year. For now I've got some accessible money in taxable but it won't even get me to 65. I'm 61 now. The rest of my taxable is all ETF shares with 40% or more LTCGs.
Certainly while I'm on ACA I'd rather not take more income from selling holdings with large gains in taxable. Any income space I do have I'm using for Roth conversions. I should be able to finish conversions sometime between 65 and 70 and should be able to take some gains at 0% tax. Once I'm on SS I'll need a lot less but if I have to sell at 15% LTCG tax I will, watching IRMAA tiers.
I'm actually taking from my HSA first, to the extent I have saved medical receipts, then Roth.
It's taking a mind shift to withdraw from the Roth first, because that's usually thought of as the last to touch. Then I remind myself that I saved this money to be able to use it in retirement, which is where I'm at.
Why do Roth conversions and Roth withdrawals in the same year instead of doing tIRA withdrawals? These are different events with different triggers. I do a larger conversion earlier in the year and top it off at the end of the year, and will do withdrawals when needed. If they happen to at the same time I'll just do a direct tIRA withdrawal, but otherwise I'll keep them separate.
Yet another reason to take from HSA/Roth before taking LTCGs is that if my medical expenses are high late in life (assisted living, memory care, etc) I can sell and write off the expenses against the income. Not quite as efficient as leaving some tax deferred for this but I don't know if and how much I'd need, and if I fully convert my IRA I won't have to deal with RMDs in the years before I have those high expenses.
So, does anyone see any flaws in this strategy? I'm 61, and my Roth has been open far longer than 5 years. Planning to take SS at 70, but will revisit this decision at 65.