Sequence of Returns Risk: Why the Order of Returns Matters More Than the Average

Imagine two retirees with $1M portfolios, both earning 7% per year on average for 30 years. One retires into rising markets. The other retires the year before a major decline. The average returns are identical. The outcomes are not: the second portfolio can be depleted a decade earlier.

That difference is sequence of returns risk, and it is the principal reason that average-return projections overstate plan safety.

Why early losses hurt more

During withdrawal, a down year inflicts two losses simultaneously: the market decline and the sale of shares at depressed prices to fund spending. Those shares do not participate in the subsequent recovery. A 20% decline at 65 with $50k of withdrawals reduces terminal wealth far more than the same decline at 85, when the balance is smaller and fewer years remain.

Contributions reverse the effect: during accumulation, early declines are favorable because contributions purchase at lower prices. Sequence risk is highest in the years immediately before and after contributions cease.

Mitigations

• A lower starting withdrawal. Each 0.5% reduction in the first-year rate produces a disproportionate improvement in the poor-sequence outcome.
• Flexibility with a trigger. Guardrail-style cuts after down years (not fixed inflation raises regardless) blunt the damage. See how guardrails work.
• Essential spending covered by guarantees. Expenditure that cannot be reduced should not depend on share sales during declines. See the lifetime expenses step.
• Cash buffer for bridge years. Holding 1–2 years of the gap between spending and guaranteed income outside the portfolio means never selling into a trough.

Asset allocation alone provides limited protection. A conservative allocation reduces both the decline and the subsequent recovery. It narrows the range of outcomes more than it improves the poorest one.

Test it, don't guess it

Average returns conceal sequence risk; simulation exposes it. The spend-down step solves the savings and timing requirement against the 10th-percentile outcome, which is dominated by poor sequences. If the answer is unacceptable, the available responses are higher savings, lower spending, later retirement, or added spending flexibility.