Sequence of Returns Risk: Why the Order Matters

Two people retire on the same day with the same pot, take the same income out every year, and earn exactly the same average return over twenty years. One of them dies with more money than they started with. The other runs dry in year fourteen. Nothing separates them except the order in which the good and bad years arrived. That is sequence of returns risk, and an average return is very good at hiding it.

The average can be identical while the path is not

Take a run of yearly returns and shuffle them. The average is untouched, because addition does not care about order. If you never put money in and never take money out, your ending balance is untouched too: the pot is just your starting figure multiplied by each year's growth factor, and multiplication does not care about order either. Sit with that for a moment, because it explains the whole problem. Order only begins to matter the moment money moves in or out of the account.

Once you are withdrawing, each year's return meets a different amount of money, and the sequence stops being cosmetic. Volatility that was merely uncomfortable while you were saving becomes structural once you are spending.

An illustration with round, invented numbers

Say someone retires with 500,000 and plans to take 20,000 a year. These figures are made up to keep the arithmetic easy, not taken from any real portfolio. In year one the market falls 30%. The pot drops to 350,000, they take their 20,000, and they begin year two with 330,000. Climbing back to 500,000 from there needs a gain of roughly a half, even though the fall itself was 30%. Now give a second retiree the identical returns in reverse order, so the 30% fall lands in their final year instead of their first. By the time it arrives they have nineteen years of growth behind them and far less remaining life to fund. Same average, same set of returns, two completely different retirements. That gap is not bad luck about how markets did. It is bad luck about when.

Selling into a fall is the actual mechanism

The clearest way to see it is to stop counting money and start counting units. Your portfolio is a number of fund units at some price, and a withdrawal is a sale of units. When the price is down 30%, the same 20,000 of income costs you far more units than it would have at the old price, and those units are gone for good. They are not sitting there when the price comes back. So a fall during withdrawal does two things at once: it cuts the value of what you hold, and it permanently shrinks how much you hold. The market can recover fully and you still will not, because you now own less of it. A retiree who avoids selling at the bottom keeps the units and keeps the recovery, and that one sentence is what every defence below is trying to buy.

The same crash is almost a gift while you are still saving

Reverse the cash flow and the risk reverses with it. Someone still paying into a fund every month is buying units, and a lower price means the same monthly amount buys more of them. A long slump early in a saver's life, followed by a recovery, is close to the best thing that can happen to them, which is the honest version of what dollar-cost averaging is doing for you. The unsettling part is that the same person, holding the same fund, flips from wanting cheap prices to fearing them on the day they stop contributing and start withdrawing.

The risk is concentrated around your last payday

Sequence risk is not spread evenly across a retirement. It bunches up in the years just before and just after you stop working, for two reasons that stack on each other. Your pot is at its largest then, so a percentage fall costs more money than it ever will again. And your capacity to respond is at its weakest, because the salary has stopped and going back to work after a few years away is harder than never leaving. Twenty years in, the picture looks different: the pot is smaller, the remaining time is shorter, and a bad stretch has less to damage. This is why a plan that looks comfortable on a long-run average can still fail, and why how long your money lasts depends on which decade the bad years land in, not only on how bad they were.

What a safe withdrawal rate is really protecting you from

The withdrawal rule most people have heard of came from work by the American financial planner William Bengen, published in the Journal of Financial Planning in 1994, and it was tested against real historical return sequences rather than against an average. That is the part that usually gets lost. A safe withdrawal rate is not the rate that works in a typical retirement. It is a rate low enough to have survived the worst starting years in the record, which is a sequence question and nothing else. Treat it as the summary of a stress test rather than a law of nature, and read what the 4% rule does and does not promise before you lean on it.

A cash buffer buys time, not return

The most common defence is to keep a chunk of near-cash, perhaps a couple of years of spending in a savings account or short-dated bonds, and to draw income from that during a bad stretch instead of selling shares. It does not raise your returns. What it buys is the right not to sell at the worst possible moment, which is exactly the damage described above. Name the cost honestly, though. Money parked in cash is money not compounding, and across a long retirement that drag is real. You are paying a small known cost to avoid a large unknown one, which is a reasonable trade, but it is a trade and not a free lunch.

Spending that can flex beats a cleverer portfolio

If you can cut your withdrawal in a bad year, even modestly, you sell fewer units at the bottom, and fewer units sold is the whole game. Some people write the rule in advance: skip the inflation increase in any year the portfolio fell, or trim discretionary spending by a set fraction after a big drop. Deciding that while you are calm is far easier than deciding it in the middle of a crash. It also tells you something useful about your plan. If there is nothing in your budget you could pause for twelve months, your plan has no shock absorber in it at all.

Earning something, for a while, is the strongest lever

Income from work during a downturn does the same job as a cash buffer with none of the drag. Part-time work, or simply retiring a year later, reduces how much you have to sell while prices are low. It is also why coast FIRE and semi-retirement arrangements are sturdier than they look on paper: they leave a source of cash that is not the portfolio. Nobody wants to plan on working. Having the option is still worth more than most portfolio tweaks.

What does not fix it

Picking a better fund does not fix it. Sequence risk is not about which assets you own, it is about the collision between your withdrawals and the path prices happen to take, and every diversified portfolio has a path. Moving to cash just before the bad stretch would work beautifully if anyone could tell you when it starts. Reaching for a higher yield so you never have to sell anything sounds like a solution and often is not, because the fattest yields tend to be attached to the shakiest payers. There is one route that genuinely hands the risk to somebody else rather than reducing it. Buying a guaranteed income for life from an insurer, an annuity, moves the sequence problem onto the insurer's balance sheet. It costs you flexibility: the decision is usually irreversible, and unless you pay for inflation protection the income can lose purchasing power over a long retirement. That is a conversation to have with a regulated adviser, not a box to tick on a website.

Stress test the start, not the average

Change the question you put to your plan. Instead of asking what average return you need, ask what happens if the three worst years you can imagine arrive in your first three. Run the numbers that way and see whether the plan survives. If it does not, you have found the problem while you can still do something about it, which is the only reason to look.

Here is a concrete step for this week. Work out how many years of spending you could cover without touching your equities, then ask yourself whether that number would feel like enough if the market fell hard the month after your last payday. If it would not, the levers available to you are all unglamorous: hold more cash, start withdrawing at a lower rate, or keep some income arriving from outside the portfolio. None of them is a fund choice, and that is the point.

Written by

Federico Romaldi

Co-Founder, Worthmap

Published: August 14, 2026

Federico is a co-founder of Worthmap, a wealth-intelligence platform built for serious investors. With a background in software engineering and a long-standing passion for value investing, he created Worthmap to bridge the gap between net-worth tracking and investment analysis.