Here’s a fact that surprises almost everyone the first time they hear it: two people can retire with the same savings, earn the exact same average return, and one runs out of money while the other dies wealthy. The difference isn’t skill, fees, or how much they saved. It’s timing— the specific order in which good and bad market years arrive. That’s sequence of returns risk, and it’s the most important retirement concept that most retirement advice quietly skips. This guide explains how it works, why it’s so dangerous in the first years of retirement, and what you can actually do about it.
What is sequence of returns risk?
Sequence of returns risk is the danger that the orderof your investment returns — not just the average — determines how long your money lasts once you start withdrawing it. A few bad years early in retirement can do permanent damage, even if the market fully recovers later.
While you’re saving, the order of returns barely matters — you’re adding money, not taking it out. But the moment you flip from saving to spendingyour portfolio, timing becomes everything. The same crash that’s a buying opportunity at 35 can be a catastrophe at 66.
The illustration that makes it click
Imagine two retirees, Pat and Sam. Both start with $1,000,000, both withdraw $50,000 a year (rising with inflation), and over their retirement both portfolios earn the exact same set of annual returns— just in opposite order.
| Pat (bad years first) | Sam (good years first) | |
|---|---|---|
| First few years | Sharp losses (e.g. −15%, −10%) | Strong gains |
| Later years | Strong gains | Sharp losses |
| Average return | Identical | Identical |
| Outcome | Portfolio severely depleted, may run out | Portfolio grows, money lasts |
Same money in, same average return, opposite results. Why? Pat is forced to sell investments at low prices early to fund withdrawals, so there are fewer shares left to rebound when the market recovers. Sam’s portfolio grew first, building a cushion that easily absorbs the later losses. The math is brutal and completely counterintuitive.
Why the first decade of retirement is the danger zone
Sequence risk is concentrated in roughly the first 5–10 years after you stop working— sometimes called the “retirement red zone.” That’s when your portfolio is at its largest, your withdrawals are just beginning, and you have the least time to recover from a hit. A 30% drop in year two of retirement is a different animal than the same drop in year twenty, because in year two you’re selling into the decline to pay for groceries.
This is also why a market crash just before or just afteryou retire is the worst-case scenario — and why your retirement date partly comes down to luck you can’t control. The goal isn’t to eliminate that luck; it’s to build a plan that survives the unlucky version.
How it connects to the 4% rule
The 4% rule exists becauseof sequence of returns risk. When William Bengen tested withdrawal rates against history, the scenarios that broke higher withdrawal rates were always the ones with terrible early years — the Great Depression, the 1970s stagflation. The 4% figure was essentially reverse-engineered to survive the worst sequences in the historical record. So when someone asks “is 4% safe?” what they’re really asking is “will my plan survive a bad sequence?”
How to defend against sequence of returns risk
You can’t control the market’s timing, but you can blunt its impact:
- Keep a cash and bond cushion.Holding 1–3 years of spending in stable assets means you can ride out a downturn without selling stocks at the bottom. (Strategies like a “bond tent” or “cash bucket” formalize this.)
- Stay flexible with spending.Trimming withdrawals during down years is the single most effective defense — it’s the lever the rigid 4% rule ignores.
- Use spending “guardrails.”Set rules to cut back when the portfolio drops below a threshold and spend a bit more when it’s flush.
- Delay Social Security.Guaranteed, inflation-adjusted income you don’t have to withdraw reduces pressure on the portfolio exactly when sequence risk is highest.
- Don’t be too aggressive right at retirement. A slightly more conservative mix in the red-zone years reduces exposure to an early crash.
How to see your own exposure
The reason a typical retirement calculator can lull you into a false sense of security is that it assumes one smooth average return every year — which erases sequence risk entirely. The honest approach is to test your plan against hundreds or thousands of possible return orders, including the unlucky early-crash paths, and measure how often your money survives.
That’s exactly what a Monte Carlo stress test does. Run your plan through 1,000 market scenarios freeand you’ll see your real probability of success — not a single tidy number that pretends the order of returns doesn’t matter. To see how this plays out for a specific balance, try how long $1 million lasts or how long your 401(k) will last — or the broader view of how long your savings will last in retirement.
Frequently asked questions
What is sequence of returns risk in simple terms?
It’s the risk that bad investment years arriving earlyin retirement — while you’re withdrawing money — permanently shrink your savings, even if the market recovers later. The order of returns matters, not just the average.
When does sequence of returns risk matter most?
In the first 5–10 years of retirement, when your balance is largest and withdrawals are beginning. The same downturn is far less damaging later in retirement.
Does sequence risk affect me while I’m still saving?
Not much. When you’re contributing rather than withdrawing, early downturns can even help by letting you buy at lower prices. The risk appears once you start drawing the portfolio down.
How do I protect against sequence of returns risk?
Hold a cash/bond cushion to avoid forced selling, stay flexible with spending, use spending guardrails, delay Social Security, and avoid being overly aggressive right at retirement. Stress-testing your plan shows how well these work for you.
This article is for educational purposes only and is not financial advice. Everyone’s situation is different. See our full disclaimer.
Sources: William Bengen (1994); Cooley, Hubbard & Walz, “Trinity Study” (1998); Morningstar, “The State of Retirement Income” (2025). The Pat/Sam example is a simplified illustration. See our methodology.