Sequence-of-Returns Risk

Sequence-of-returns risk is the danger that the order in which returns occur — not just their average — can make or break a retirement. During the accumulation years, when you are adding money, the sequence barely matters; what counts is the average return over the whole period. But once you begin withdrawing, a run of bad returns early on can inflict damage that even strong later returns cannot repair.

The mechanism is simple but brutal. When a portfolio falls and you are simultaneously selling shares to fund living expenses, you lock in losses and leave fewer shares to participate in the eventual recovery. Two retirees who experience the exact same set of annual returns in reverse order can end up with wildly different outcomes — one comfortable, one running out of money — purely because one hit the bad years first. This is why max drawdown and the timing of losses matter so much more to a retiree than to an accumulator.

The risk is the central reason a safe withdrawal rate has to be set conservatively. The famous 4% rule is really an answer to the question: what starting withdrawal rate survived even the worst historical sequences, including retirements that began just before major crashes? An average return is not enough; the plan must withstand a terrible beginning.

Investors manage sequence risk in several ways: holding a larger bond and cash buffer in the years right around retirement, using a rising-equity glide path, staying flexible by trimming spending after down years, or keeping a cash reserve to avoid selling stocks into a slump. The withdrawal calculator on this site illustrates how sensitive a plan is to its assumptions, and the simulator's withdrawal mode lets you test real historical sequences rather than a single average.