Why the conventional withdrawal order is a default, not an answer

The conventional order is simple to state. Spend from taxable accounts first, let traditional accounts keep growing, and touch the Roth last so it compounds tax-free for as long as possible. It is a reasonable default, and for households with a short retirement or a small traditional balance it often is the right answer. For most of the people we work with, it is a starting point that leaves something on the table.

The problem is the low-bracket years. The years between retiring and starting Social Security or required distributions are often the lowest-income years of your adult life. Following the conventional order through them means living on taxable accounts while brackets sit partly empty, then being forced into higher brackets later when required distributions begin and the room is gone.

What drawing from two accounts at once does

The alternative is to treat each year as a bracket to be filled deliberately. Take enough from the traditional account to use the low brackets fully, and cover the rest from taxable or Roth money, which typically adds less to that year's tax bill. The total tax paid across the retirement often comes out lower, not because any single year is clever, but because no year is wasted.

Where the default still holds

The Roth-last part of the conventional order usually survives. Roth money grows tax-free, generally passes to heirs income-tax-free, and has no required distributions during your lifetime, so there are few good reasons to spend it early. What changes is the middle. Traditional money is not something to avoid touching. It is something to draw on a schedule, in the years when drawing is cheap.

None of this is knowable once and for all. The right sequence depends on the balances, the pensions, the claiming ages, and the state you live in, and it shifts as those change. What matters is that the order is chosen each year rather than inherited from a rule of thumb, because the difference between the default and the deliberate version compounds for thirty years.