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The order in which market gains and losses happen after you retire matters more than the average return itself. Here's why, and how to protect an early-retirement plan against it.
Two people can retire with the exact same portfolio, the exact same average market return over 30 years, and end up with wildly different outcomes — one runs out of money, the other doesn't. The difference isn't luck in the usual sense; it's the order those returns happened in. This is sequence of returns risk, and it's one of the most important concepts for anyone withdrawing from a portfolio.
While you're still working and adding money, a crash early in your investing life barely matters — you have decades to recover, and you're buying more shares while prices are low. But once you start withdrawing, a crash in the first few years forces you to sell more shares at depressed prices just to cover expenses, permanently shrinking the pool that's left to recover when the market bounces back.
Two retirees each start with $1,000,000 and withdraw $40,000/year. Retiree A hits a 20% market drop in year one, then recovers. Retiree B hits that same 20% drop in year twenty, after two decades of growth. Retiree A's portfolio, having taken the hit while it was smallest and still needing to fund withdrawals through the recovery, ends up meaningfully worse off than Retiree B — even though both experienced the identical average return over the full period.
A 65-year-old with a 25-year retirement horizon has less total exposure to this risk than a 40-year-old with a 50-year horizon — more years means more chances for a bad sequence to land early. This is a core reason FI planners often build in extra cushion rather than withdrawing right up to the calculated limit from day one.
Planning for the average market return and assuming your actual experience will resemble it. Averages smooth over the exact scenario that sequence risk is about — the specific, unlucky order events happen to occur in for you personally.
Nobody can know in advance whether a downturn will hit in year one or year twenty of retirement. The goal isn't prediction — it's building enough flexibility (cash buffer, adjustable spending, a bridge income option) that a bad sequence doesn't derail the whole plan.
Much less — while you're still contributing, a downturn actually helps you by letting you buy shares at lower prices. The risk becomes significant specifically once you start withdrawing instead of contributing.
There's no single right answer — one to three years of expenses is a common range, balancing protection against a downturn with not holding so much cash that it drags down long-term growth.
They're related but not identical — volatility is about how much returns swing, while sequence risk is specifically about the order those swings happen in relative to when you're withdrawing money.