Sequence of returns risk, explained.
Two retirees can have the same starting balance, the same average return, and the same withdrawal rate — and one runs out of money while the other dies wealthy. The difference is sequence of returns risk.
During the accumulation years, the order of returns doesn't matter much. A 20% loss in year one followed by a 25% gain in year ten ends in the same place as a 25% gain in year one followed by a 20% loss in year ten. In retirement, that's no longer true. The math changes the moment you start taking money out.
Why withdrawals change everything
When you're withdrawing, every dollar taken out during a down market is a dollar that cannot recover when the market rebounds. Sell at a loss to fund this year's expenses and that capital is permanently gone from your portfolio. Compound that over a bad first decade and the portfolio may never recover, even if average returns over thirty years would have been fine.
The 2000–2002 retiree
A retiree who started drawing income from a 60/40 portfolio in January 2000 faced three consecutive losing years (S&P 500 down 9%, 12%, 22%) right out of the gate. Even though the next decade-plus of returns averaged out reasonably, many of those portfolios never made it. Sequence killed them, not average.
The 2009 retiree (lucky)
A retiree who held nerve and started drawing in March 2009 caught a historic recovery. Same allocation, same withdrawal rate — vastly different outcome. The retirement-readiness math doesn't reflect this; the calendar does.
Defenses that actually work
You can't time when you retire to coincide with a bull market. What you can do: (1) hold one to three years of essential spending in cash and short-term bonds so you never have to sell equities in a down year; (2) rebalance into stocks during downturns when comfortable doing so — the discipline buys low instead of selling low; (3) start with a more conservative allocation early in retirement and re-risk over time (the 'rising equity glidepath') — counterintuitive but well-researched; (4) build flexibility into spending so you can throttle back discretionary expenses in bad years.
Why the 4% rule isn't the answer
The famous '4% safe withdrawal rate' assumes you'd stick with the plan through a 1929 or 1973 sequence. Almost no real human does. Real people get scared and sell. So in practice, the 4% rule isn't really 4% — it's whatever rate survives the average retiree's behavior, which is closer to 3%. Planning around sequence risk explicitly is what gives you the latitude to actually stick to a higher sustainable rate.
Annuities and the floor strategy
A single-premium immediate annuity for essential expenses takes sequence risk off the table for that portion of your income — at the cost of liquidity and inflation-fighting power. Whether that trade is worth it depends on your other resources, your spouse's situation, and your comfort with the issuing insurance company's claims-paying ability.
The retirees who survive bad sequences aren't the ones with the highest average returns. They're the ones who didn't have to sell at the worst possible time.