Sequence of returns risk

Sequence of returns risk is the risk that the order in which investment returns are realised affects the eventual outcome of a withdrawal plan, even when the average long-run return is unchanged. It is the single most important risk in retirement income planning and the key reason why retirement portfolios behave differently from accumulation portfolios.

Why sequence matters in retirement

During accumulation, the order of returns is largely irrelevant. A 30% market drop early in a working career is offset by ongoing contributions buying at lower prices, and the long-run average return is what drives the final outcome.

In retirement, the dynamic reverses. A 30% drop early in retirement forces the retiree to sell into a falling market to fund withdrawals. Those sales lock in losses on the depleted capital, and the portfolio cannot recover the way it would have without the withdrawals. The same drop late in retirement, after two decades of growth, has a smaller proportional impact on the original capital and is much easier to absorb.

A simple example

Consider two retirees with identical 30-year average returns of 7% but mirror-image sequences. Retiree A experiences −20%, −10%, then strong returns; Retiree B experiences strong returns first, then −20%, −10% near the end. Both withdraw the same inflation-adjusted amount each year.

Retiree A may exhaust the portfolio decades early. Retiree B may end retirement with substantial residual capital. Same average return, completely different outcomes — that is sequence of returns risk in practice.

How to manage it

• Lower initial withdrawal rates — accept a lower starting rate to give the portfolio more cushion against early-year losses
• Cash buffer — hold 1–3 years of spending in cash or short-term bonds, so withdrawals during market drawdowns can come from the buffer rather than equity sales
• Flexible withdrawal rules — reduce withdrawals in years following market drops, smoothing the impact across time
• Bond glide path — start retirement with a higher allocation to defensive assets and rotate gradually back into equities, reducing exposure during the high-risk early years
• Delay retirement — even a short delay, accepting one or two more years of accumulation, can materially reduce the risk

Why it does not affect accumulation

A working investor making regular contributions through a market drawdown buys more units at lower prices, which boosts long-run returns. The retiree drawing through the same drawdown sells more units at lower prices, which permanently reduces the portfolio. The asymmetry is not psychological — it is mathematical, and it is the central reason why retirement income strategies differ so sharply from accumulation strategies.