If two investors earn the same average return, why does one retire comfortably while the other runs short? Often, the difference is not the size of the returns, but the order they arrive in. That is the core of sequence of returns risk, a retirement planning concept that matters most when you are withdrawing from a portfolio instead of adding to it.
In plain English, sequence of returns risk means that the timing of market gains and losses can change your outcome even if the long-term average return looks similar. Early losses can do more damage than later losses because withdrawals keep coming while the portfolio is down. For retirees and 401(k) savers nearing retirement, that timing can become one of the biggest drivers of how long savings last.
What sequence of returns risk actually means
Think of a retirement portfolio as a bucket that is being slowly emptied. Each year, you take water out for spending, and the market either refills some of it or drains more away. If bad years happen early, you are taking withdrawals from a smaller bucket. That leaves less money available to recover when markets improve later.
A simple definition:
- Sequence of returns risk is the risk that the order of investment returns changes your results, especially when you are withdrawing money.
This risk affects people differently depending on their stage of life:
- During accumulation, when you are still saving, market drops can be frustrating but sometimes help future contributions buy more shares at lower prices.
- During retirement, when you are withdrawing, early losses can be much more harmful because fewer assets remain to rebound.
The key point is not that markets are good or bad in any given year. It is that the same set of returns can produce very different outcomes depending on when they happen.
Why the order of returns matters more than the average
Average return sounds comforting, but averages can hide pain. Two portfolios might both have the same average over several years, yet one could experience a rough first half and a strong second half, while the other does the opposite. Those two paths do not feel the same if you are pulling money out along the way.
Here is why:
- A withdrawal removes part of the portfolio.
- A market loss reduces what is left.
- The next withdrawal is taken from an even smaller base.
- Recovery has less capital to work with.
That creates a compounding effect in the wrong direction. Losses early in retirement can snowball because the portfolio has to support spending while also recovering from declines.
A simple example helps.
Suppose two retirees each start with the same portfolio and withdraw the same amount each year. Both experience the exact same three yearly market returns, but in different order.
- Retiree A gets good returns first, then bad ones later.
- Retiree B gets bad returns first, then good ones later.
Even if the average return over the full period is identical, Retiree B may end up with less money because the early losses happened when the portfolio was most vulnerable. The spending came out before the rebound, which reduced the portfolio's ability to recover.
A worked example in general terms
Let’s keep this simple and avoid focusing on exact market figures.
Imagine two retirees, each starting with the same nest egg and withdrawing the same steady amount each year.
Case 1: Strong early years
In this version, the portfolio has decent gains at first. Withdrawals come from a larger balance, so the account can absorb the spending more easily. Later, if a rough year arrives, the portfolio may still have enough cushion to stay on track.
Case 2: Weak early years
In this version, the portfolio drops soon after retirement begins. The same withdrawal now comes from a smaller balance. That means less money remains invested, and the eventual recovery has a weaker base. Even if the market improves later, the damage from the early dip may already be locked in.
This is why retirees often care less about the average return headline and more about the path the market takes. A portfolio does not experience returns in a neat spreadsheet. It experiences them in real time, while bills still need to be paid.
Tilelli users can also look at their broader setup in the Investor Profile and Retirement Runway screens, which help frame retirement spending alongside portfolio context and timing.
Why this risk shows up most at retirement
Sequence risk is strongest around the years when withdrawals begin because that is when two forces collide:
- You are no longer adding fresh money.
- You are spending from the portfolio whether the market is up or down.
That makes the first several years of retirement especially important. If markets are weak during that window, the portfolio may shrink quickly. If markets recover later, there is less money left to benefit from the rebound.
This does not mean retirement planning is impossible or that one bad year ruins everything. It means the timing of withdrawals deserves attention.
Common situations that increase concern include:
- A large planned withdrawal rate
- A retirement that begins after a market decline
- A portfolio with little cash reserve
- Spending that is hard to reduce when markets fall
The concept also helps explain why retirees often think in terms of resilience, not just returns. A retirement plan has to survive both markets and spending needs at the same time.
Ways people think about managing the risk
This is an educational topic, not a one-size-fits-all rule. Different investors approach the issue in different ways, but the general idea is to reduce the chance that early losses force large withdrawals from a shrinking portfolio.
Some commonly discussed ideas include:
- Keeping a cash buffer, so spending can be covered without selling investments during a downturn
- Using a more balanced asset mix, which may reduce the size of drops compared with a portfolio concentrated in one asset type
- Being flexible with withdrawals, so spending can adjust if markets are under pressure
- Planning for multiple income sources, which can reduce pressure on the portfolio
- Thinking about retirement timing, since leaving work right after a market decline can increase stress on savings
None of these steps removes risk completely. They simply help reduce the chance that bad timing does the most damage.
A useful way to think about it is this: the goal is not to avoid every market drop. The goal is to make sure a drop does not force permanent harm at the wrong time.
A short checklist for readers
Use this checklist to pressure-test your own understanding of sequence of returns risk:
- Do I know whether my plan depends on steady withdrawals or flexible spending?
- Would my portfolio still look reasonable if the first few retirement years were weak?
- Do I have any cash or short-term reserves to avoid selling after a decline?
- Have I thought about what happens if retirement starts right before a downturn?
- Am I focusing only on average return, or also on the order of returns?
If these questions feel uncomfortable, that is normal. The point of the concept is not to scare you. It is to show that retirement outcomes are shaped by both market performance and timing.
Key takeaways
- Sequence of returns risk is the risk that the order of market gains and losses changes your outcome.
- The risk matters most when you are withdrawing money, especially in the early years of retirement.
- Early losses are often more damaging than later losses because withdrawals reduce the portfolio before it has a chance to recover.
- Two portfolios can have the same average return and still end up in very different places.
- Planning for flexibility, reserves, and resilience can help reduce the impact of bad timing.
If you remember only one thing, make it this: retirement is not just about what the market returns, it is also about when those returns happen. That timing can quietly shape whether a portfolio lasts.
This article is for informational and educational purposes only and does not constitute financial advice.