Sequence of Returns Risk Explained: Why Order Matters (2026)

Sequence of returns risk is the danger that poor returns arrive early in retirement, when you are withdrawing, rather than late. The average return over thirty years can be identical in both cases and the outcomes wildly different, because a withdrawal taken from a fallen portfolio sells more units, and those units are permanently gone from the recovery. Order matters only once you are taking money out.

Why the Same Average Produces Different Outcomes

While you are accumulating, a market fall is helpful: your contributions buy more units at lower prices, and the average cost of your holdings falls. The moment you begin withdrawing, that reverses. A fixed withdrawal from a portfolio down 30% consumes roughly 43% more units than the same withdrawal from an undamaged one, and the portfolio has fewer units left to participate in the rebound.

This is why the first five to ten years of retirement carry disproportionate weight. A bad decade at the start can be unrecoverable; the same decade at the end is largely irrelevant, because by then you have already funded most of your spending.

The Arithmetic, Made Concrete

The clearest demonstration is to take one set of annual returns and simply reverse the order. The arithmetic mean is unchanged, the compound growth of an untouched lump sum is unchanged, and yet a retiree drawing income from it can run out in one ordering and finish wealthy in the other.

That result surprises people because it contradicts the mental model of an average annual return. Averages are only sufficient when nothing enters or leaves the portfolio.

Both retirees: $1,000,000 start, $45,000 withdrawn
each year, 20-year return series, same average 6.2%
Retiree A: bad years first
  Year 1  -22%   balance after withdrawal   $735,000
  Year 2  -11%   balance                    $609,000
  Year 3   -6%   balance                    $527,000
  Years 4-20 average +11.4%
  Final balance                             $611,000
Retiree B: same returns, reversed
  Years 1-17 average +11.4%
  Year 18  -6%   balance                  $1,462,000
  Year 19 -11%   balance                  $1,256,000
  Year 20 -22%   balance                    $934,000
  Final balance                             $934,000
Difference on identical returns            $323,000
Stretch the bad years to -30% and Retiree A
runs out entirely in year 17.

Nothing about Retiree A's investment choices was worse. They retired in a different year, which is not a decision most people get to make.

The Four Defences That Actually Work

A cash and short-bond sleeve covering two to three years of spending means a downturn does not force a sale. Flexible spending, where you reduce withdrawals in a bad year rather than holding them fixed, is the single most effective protection and costs nothing. Keeping some equity exposure prevents inflation from doing the damage the market did not.

The fourth is guaranteed income. Social Security is inflation-adjusted and does not fall when markets do, so the larger a share of spending it covers, the less exposed the portfolio is. The Social Security Administration increases benefits for each year you delay claiming past full retirement age up to seventy, which converts a market-exposed withdrawal into a guaranteed one.

1. Hold two to three years of planned spending in cash and short bonds before you stop working.
2. Set spending rules in advance: which expenses you will cut, and at what portfolio level.
3. Keep meaningful equity exposure, because a thirty-year retirement faces inflation risk too.
4. Model the effect of delaying Social Security, since guaranteed income directly reduces sequence exposure.
5. Consider working one or two extra years if markets fall as you approach the date; it helps twice over.