What is Sequence Risk?
Sequence of returns risk means that the order of investment returns matters as much as their average when you are withdrawing from a portfolio. During accumulation, the sequence is largely irrelevant because you are adding money. During decumulation, a market crash in the first few years forces you to sell assets at depressed prices to fund withdrawals, permanently reducing the portfolio's recovery potential.
The Numbers Tell the Story
Consider a $1 million retirement portfolio with $50,000 annual withdrawals. If the first three years return +10%, +8%, +12%, the portfolio remains above $950,000 after a decade. If those same returns are reversed to -20%, -15%, -10% in the first three years, the portfolio drops below $500,000 by year ten despite identical average returns over 30 years. The sequence alone can change portfolio longevity by over a decade.
| First three years of withdrawals | Strong start (+10%, +8%, +12%) | Crash at the start (-20%, -15%, -10%) |
|---|---|---|
| Balance after ten years | Above $950,000 | Below $500,000 |
| Effect on portfolio longevity | Plan barely affected | Over a decade shorter |
Both columns start from the same $1 million portfolio, withdraw $50,000 every year, and earn the same average return across the 30-year horizon. Only the order of the first three years differs.
Mitigation Strategies
The 'risk zone' spans roughly two years before through three years after retirement. Reducing equity exposure during this window is the most effective defense. The bucket strategy maintains 2-3 years of living expenses in cash and short-term bonds, avoiding forced stock sales during downturns. Flexible withdrawal rules that reduce spending during bear markets further protect against sequence risk.
Rising Equity Glide Path
Research by Wade Pfau and Michael Kitces suggests a counterintuitive approach: start retirement with a lower equity allocation (perhaps 30-40%) and gradually increase it over time (to 60-70%). This 'rising equity glide path' reduces exposure to sequence risk in the critical early years when the portfolio is most vulnerable, and their simulations found it improved 30-year success rates compared with a static 60/40 allocation while also softening worst-case outcomes.
Flexible Withdrawal as a Defense
The most powerful mitigation is flexibility in spending. If you can reduce withdrawals by 10-20% during bear markets, you dramatically improve portfolio survival. The Guyton-Klinger guardrails approach sets upper and lower thresholds around the withdrawal rate: when portfolio declines push the rate above the upper guardrail, you cut spending by 10%; when growth pushes it below the lower guardrail, you give yourself a 10% raise. The trade-off is accepting variable income, which requires a lifestyle that can absorb temporary spending cuts.