Most retirement content talks about how much you need. Very little talks about when you need it. Timing shouldn’t matter—but it does. It might be the single most important variable in whether your retirement plan works or fails.
This is the concept that the retirement industry calls “sequence-of-returns risk.” It sounds technical. It’s not. It’s the simplest and most dangerous idea in retirement planning, and most calculators either ignore it or bury it in a footnote.
The Problem in One Sentence
Two people can retire with the same amount of money, invest the same way, earn the same average return over 30 years, and one of them runs out of money while the other dies rich. The only difference is the order in which the returns showed up.
That’s it. Same savings. Same strategy. Same average. Completely different outcomes. The order matters because you’re withdrawing money at the same time the market is moving. And withdrawals during down years do permanent damage that good years later can’t fully repair.
How It Works
Say you retire with $1 million and plan to withdraw $50,000 a year.
In the first year, the market drops 25%. Your portfolio falls to $750,000. You still need $50,000 to live on, so you withdraw it. Now you’re at $700,000. That’s 30% of your original portfolio gone in year one—before the market has a chance to recover.
Now the market bounces back 20% in year two. That 20% is applied to $700,000, not $1 million. You gain $140,000 instead of $200,000. After your $50,000 withdrawal, you’re at $790,000.
Two years in, after a crash and a strong recovery, you’ve already lost over 20% of your starting balance—permanently. And you still have 28 years of withdrawals ahead of you.
Now reverse the sequence. Same returns, same withdrawals, but the good year comes first and the bad year comes second. After two years, you’d have roughly $860,000. That’s a $70,000 difference from the same average return, and it compounds every year for the rest of your retirement.
Stretch this effect over five or ten years of unlucky timing, and the gap between the good-sequence retiree and the bad-sequence retiree becomes hundreds of thousands of dollars. One retires comfortably. The other goes back to work at 74.
Why Averages Lie
The financial industry loves averages. “The market returns 7-10% over time.” This is historically true and practically useless for a retiree.
During the accumulation phase—when you’re working and adding money—averages work in your favor. Bad years are buying opportunities. You’re purchasing shares at lower prices. Time is on your side.
The moment you retire and start withdrawing, the math flips. Bad years are no longer buying opportunities. They’re permanent damage. Every dollar you withdraw during a down market is a dollar that can never participate in the recovery. The sequence of returns doesn’t just matter—it’s the whole game.
This is why a Monte Carlo simulation exists. It doesn’t tell you the average outcome. It tells you the distribution of outcomes—including the ones where you retire into 1929, 1973, 2000, or 2008. The question isn’t “what happens on average?” The question is “what happens if I’m unlucky?”
The Danger Zone
Research consistently shows that the first five to ten years of retirement are the most critical. If you survive the first decade without a catastrophic sequence, your plan is very likely to succeed. The portfolio has had time to grow, Social Security or other income has kicked in, and the remaining time horizon is shorter.
But if you take a major hit in those early years while withdrawing at full pace, the math becomes very difficult to recover from. Financial planners call this window the “retirement red zone”—the five years before and ten years after you stop working.
This is also why retirement timing can feel like a gamble. Two people who retire one year apart, with identical savings and identical spending, can have wildly different outcomes depending on what the market does in that narrow window. It’s not fair. But it’s real, and pretending it isn’t doesn’t help.
What You Can Actually Do About It
You can’t control the market. You can control how exposed you are to a bad sequence. Here are the levers that actually work:
Build a cash buffer. Having two to three years of spending in cash or short-term bonds means you don’t have to sell stocks during a downturn. If the market drops 30% in year one, you live off the buffer while your portfolio recovers. This single move neutralizes the worst of sequence risk. It’s boring. It works.
Reduce spending in down years. A rigid spending plan is the accelerant that turns a bad sequence into a catastrophe. If your plan allows for a 10-15% spending cut in years when the portfolio drops significantly, your success rate improves dramatically. This doesn’t mean living in deprivation. It means skipping the big trip or delaying the car replacement until the market recovers. Flexibility is the cheapest insurance in retirement.
Delay retirement by one year. If the market drops 20% the year before you planned to retire, working one more year does three things: it avoids withdrawing from a depressed portfolio, it adds one more year of contributions, and it gives the portfolio a year to recover. That single year can move a success rate from 70% to 85%.
Diversify your withdrawal sources. If you have money in taxable, traditional, and Roth accounts, you can choose where to pull from based on market conditions. Sell from the account that’s down the least, or pull from cash reserves while leaving equities alone. This kind of tactical withdrawal flexibility is one of the most underrated tools in retirement planning.
The mechanics of which account to pull from and when are covered in Withdrawal Sequencing.
Don’t over-allocate to stocks right at the transition. During your working years, heavy stock allocation makes sense because time heals drawdowns. At the point of retirement, a more balanced allocation—maybe 50/50 or 60/40 instead of 80/20—limits the depth of the initial decline you’d experience in a crash. You give up some upside in exchange for a smaller downside during the years when downside matters most.
What This Means for the Calculator
When you run your numbers on the calculator, the success rate you see isn’t based on average returns. It’s based on thousands of simulated paths drawn from 99 years of actual market history—including every crash, every recession, every awful five-year stretch. The simulation shuffles the historical years randomly and tests whether your money survives each path.
A success rate of 85% means your plan survived 85 out of 100 simulated futures. The 15 that failed? Those are the bad-sequence futures. The ones where you retire into the Great Depression or the dot-com crash or the 2008 financial crisis—and your withdrawals compound the damage.
Understanding this is the difference between using the calculator as a fortune teller and using it as a stress test. The number isn’t a prediction. It’s a measure of how resilient your plan is against the thing you can’t control.
If your number is lower than you’d like, the answer isn’t to hope for good markets. The answer is to build a plan that survives the bad ones.
Ready to stress-test your plan? Run your numbers.
