How it works
Sequence-of-returns risk is the fact that AVERAGE returns tell you almost nothing about survival once you are withdrawing — the ORDER dominates. Withdrawals convert early losses into permanent ones: sell shares after a crash and no rebound can restore the shares you spent. This stress test makes the asymmetry visible with two engineered paths sharing one average: an even-return baseline versus a scenario stacking ten weak years up front, then a catch-up stretch calibrated so the arithmetic average matches exactly. On million-dollar defaults — 4% initial withdrawal inflating 2.5% — the smooth path compounds comfortably while the weak-start variant fights withdrawals through a decade of declines and can finish dramatically lower, sometimes depleting outright despite the identical long-run average. The required catch-up rate output exposes how heroic the recovery assumption must be, which is precisely the honesty averages hide. Mitigations follow from the diagnosis: trim early withdrawals, hold a cash-and-bond reserve for the fragile first decade, or adopt guardrails that cut spending after down years. Illustrative single scenarios, not forecasts of any particular decade.
Formula
Each year: portfolio = (portfolio − withdrawal) × (1 + return) | Weak-start path: poor return for first N years, solved catch-up after | Both averages equal by construction
Tips
- Judge plans by early-decade behavior, never the average return printed in a brochure.
- Hold 1–2 years of spending in cash and 5–8 in bonds to avoid selling stock lows.
- Cut the first-decade withdrawal by even 1% and rerun — sensitivity is enormous.
- Guardrail rules that skip raises after down years attack exactly this failure mode.
- Retiring INTO a bear market is the dangerous case; test that entry explicitly.
Frequently asked questions
- What is sequence of returns risk in plain terms?
- It is the danger that POORLY TIMED bad years — early in retirement — wreck a plan whose average returns looked fine. Losing 20% while withdrawing 4% means selling extra shares at depressed prices, permanently shrinking the base that later good years multiply. Accumulators face a milder mirror image.
- Why do average returns not matter as much in retirement?
- Because withdrawals reverse the math. Growth compounds multiplicatively on whatever base remains; selling shares during downturns removes base permanently. Two thirty-year experiences with identical 7% averages can end six figures apart per million dollars purely from ordering — the difference this stress test quantifies.
- How can I protect against bad early retirement returns?
- Layer defenses: cash covering one to two years of spending, bond sleeves covering five to eight more, an initial withdrawal rate near 4%, and flexible rules that skip raises after losses. Trimming year-one withdrawals by even $10,000 materially changes where this stress test ends.
- Does sequence risk matter before retiring?
- Far less, and differently. Without withdrawals, later strong years fully repair earlier weak ones — a 2008 buyer finished fine. The real accumulation-era danger is behavioral: panic-selling converts paper losses into the permanent kind right before the highest-stakes decade begins.
- How many years of poor returns can a retirement survive?
- Depends on withdrawal rate and defense depth. At a 4% initial withdrawal with cash and bond buffers, historical worst-case sequences stayed solvent through decade-long slumps; at 6%+ the same stretch approaches depletion. Run the stress inputs at -2% for ten years to see where your plan breaks.