Sequence of Returns Risk
Sequence of returns risk is the danger that the timing of investment losses — particularly in the early years of retirement — will permanently deplete a portfolio even if long-term average returns are adequate, because withdrawals taken during a downturn lock in losses and reduce the base available for recovery.
Sequence of returns risk is distinct from average return risk. Two investors who earn an identical compound average annual return over the same period can experience very different outcomes if one encounters poor returns early and the other encounters them late. During the accumulation phase, this asymmetry is relatively benign — a younger investor can continue contributing and buying more shares at lower prices. During the distribution phase, when the investor is withdrawing rather than contributing, the sequence matters enormously.
Consider a simplified example. A retiree starts with a $1 million portfolio and withdraws $50,000 per year. In Scenario A, the portfolio loses 30% in year one, then earns 10% per year for the next 29 years. In Scenario B, the portfolio earns 10% per year for 29 years, then loses 30% in year 30. Despite identical average returns, the retiree in Scenario A is likely to exhaust the portfolio years earlier than the retiree in Scenario B. The early loss dramatically reduces the compounding base, and each subsequent withdrawal takes a larger proportional bite out of the diminished portfolio.
The primary risk mitigation strategies address the problem from different angles. Cash buffer strategies — including the bucket approach — avoid forcing sales of equities during downturns by having liquid assets earmarked for near-term spending. Dynamic withdrawal strategies reduce withdrawals in response to portfolio losses, accepting a variable standard of living in exchange for improved portfolio survival. Guaranteed income flooring establishes a base of spending covered by Social Security, pensions, or annuities, so the investment portfolio need not be depleted to cover essential expenses during market downturns.
Sequence risk is most acute in the five to ten years immediately before and after retirement — a period sometimes called the retirement red zone. A major bear market during this window is particularly destructive because the portfolio is at or near its peak value and future contributions are limited or nonexistent. Strategies such as reducing equity exposure as retirement approaches (a glide path) and gradually increasing guaranteed income sources during this window are designed to reduce exposure during this vulnerable period.
The SECURE 2.0 Act's provisions encouraging in-plan annuity options and lifetime income illustrations on participant benefit statements are partly a legislative response to sequence of returns risk, acknowledging that defined contribution plan participants need tools to convert accumulation into a sustainable income stream that does not depend entirely on favorable return sequencing.