Here is the strangest fact in retirement math. Once withdrawals start, your average return stops deciding your outcome. The order of the returns takes over.
Meet two retirees. Each starts with $1,000,000 and withdraws $60,000 a year. Each earns the exact same 25 annual returns: three bad years (−25%, −15%, −10%) and twenty-two good ones (+12%).
Same numbers. Same 8.56% average. One difference: Retiree A hits the bad years first, right at retirement. Retiree B hits them last.
The two-retiree test
| End of year | Retiree A (bad years first) | Retiree B (bad years last) |
|---|---|---|
| Start | $1,000,000 | $1,000,000 |
| Year 3 | $413,850 | $1,202,464 |
| Year 10 | $309,550 | $2,052,924 |
| Year 15 | $164,362 | $3,236,783 |
| Year 18 | $28,452 | $4,344,983 |
| Year 19 | Depleted | $4,806,381 |
| Year 25 | $0 | $3,598,251 |
Hypothetical returns, chosen only to show the mechanics — no fund or Capital Wealth model performed this way, and taxes, fees, and inflation are ignored.
Retiree A is broke six years early. Retiree B dies with $3.6 million.
The kicker: with no withdrawals, both portfolios end at an identical $6.94 million. Order does not matter to money nobody touches. Sequence-of-returns risk — the danger that bad years land right as withdrawals begin — is a withdrawal problem, not a market problem.
Every dollar sold in a down year can never recover. Selling at a loss to eat turns a temporary decline into a permanent one.
The fragile decade
The math has a geography: roughly five years on either side of retirement day. Before that window, a crash is a buying opportunity, because you are still saving. After it, the portfolio has usually grown a cushion.
Inside the window, everything is exposed at once. Largest balance of your life. Withdrawals just started. No paycheck to wait it out.
The famous 4% rule is really a sequence-risk artifact. Bengen’s 1994 research found 4% survived the worst historical starting years — retiring into 1929, or into the 1966 inflation grinder. The safe rate is set by the unlucky orders, not the average ones.
And 2022 ran the experiment live. Stocks fell about 18% and the investment-grade bond index fell about 13% — both engines failing at once while inflation pushed withdrawals up. Anyone who retired around 2021 was living the left column of that table.
The honest fixes
Nobody can predict which decade they are retiring into. But you can engineer around it, and each tool has a price worth naming.
A cash buffer: one to three years of spending in cash or short bonds, so a bear market never forces a stock sale. The cost: cash drags in the good decades.
Guardrail withdrawals: trim spending modestly when the portfolio falls below a line, and take raises above it. This measurably extends portfolio life — if your budget can actually flex.
Risk-capacity allocation: size the stock exposure to how much loss the plan can absorb in the fragile decade. Not to your age. Not to your nerve.
Now the CalSTRS and CalPERS advantage: your pension is the floor. If the formula check already covers the mortgage and groceries, you pre-purchased the expensive fix. The portfolio’s job shifts to discretionary spending, inflation topping, and legacy — and a bad first decade cannot break the household.
Map your own fragile decade. Add guaranteed monthly income against non-negotiable bills. Only the gap between them is exposed to sequence risk, and the portfolio should be built around that number.