Sequence of Returns Risk: Why the Order of Your Investment Returns Matters

Two portfolios can earn the exact same average annual return over twenty years and end up with wildly different final balances, purely because of the order in which the good and bad years occurred. This is sequence of returns risk, and it is one of the most underappreciated risks in long-term investing.

It matters most for anyone withdrawing money from a portfolio, retirees drawing income being the clearest case, but the underlying mechanics apply to any situation where money moves in or out of an account at different points in a market cycle.

What Sequence of Returns Risk Actually Means

Sequence of returns risk describes how the timing of gains and losses affects a portfolio's ending value, separate from the average return itself. A portfolio that loses money early and recovers later behaves very differently from one that gains early and loses later, even with an identical average.

This only matters when money is flowing in or out of the portfolio along the way. A portfolio left completely untouched, with no additions or withdrawals, ends up at the same value regardless of the order returns arrive in, since multiplication is commutative.

The risk is easy to overlook precisely because it depends on an interaction, timing plus cash flow, rather than either factor alone. A portfolio manager can control asset allocation and a client can choose a withdrawal amount, but neither one alone determines the outcome without accounting for how the two interact over time.

The takeaway: sequence risk exists specifically because real portfolios have cash flows, contributions or withdrawals, that interact with market timing in ways a simple average return figure completely ignores.

Why Average Return Alone Can Be Misleading

A headline average annual return is a useful summary statistic, but it hides the path a portfolio actually took to get there. Two portfolios with an identical seven percent average annual return can have final balances that differ by a wide margin depending purely on year-by-year order.

This is especially misleading for anyone planning withdrawals based on a long-run average return assumption, since that average was never actually experienced in a single, smooth path. Real returns arrive in an unpredictable sequence of good years, bad years, and everything in between.

Financial planning tools that only project a single average growth rate forward miss this entirely, which is why more rigorous retirement projections use a range of historical or simulated return sequences instead of one smooth assumed rate, specifically to capture how much outcomes vary based on the order returns actually arrive in.

The takeaway: an average return tells you where a portfolio ended up on average across many possible paths, not what actually happens along any single real path with real cash flows.

How Sequence Risk Hits Hardest During Withdrawals

Withdrawing a fixed amount from a portfolio during a down year forces the sale of more shares to raise that same amount of cash, permanently reducing the number of shares left to participate in any later recovery. This effect compounds every year withdrawals continue during a downturn.

The opposite is true for gains that arrive early. A strong first few years of withdrawals leaves a larger remaining balance to weather any later downturn, giving the portfolio meaningfully more resilience than an identical portfolio that hit its losses in the early withdrawal years instead.

The takeaway: a downturn in the first few years of withdrawals does far more lasting damage than the same downturn arriving later, because withdrawals lock in losses that a portfolio never gets the chance to recover from.

The Accumulation Phase: Lower Risk, But Not Zero

During the accumulation phase, when contributions are being added rather than withdrawn, sequence risk works in the opposite direction. Early losses followed by later gains can actually be favorable, since ongoing contributions buy more shares at depressed prices before the eventual recovery plays out.

Sequence risk is not zero during accumulation, though. A large lump sum invested right before a downturn, or a market decline arriving just before a planned transition into withdrawals, still carries real sequence risk that deserves attention as that transition approaches.

The years immediately before and after a transition from accumulation to withdrawal carry the most risk of all, sometimes called the retirement red zone, since a downturn landing in that specific window combines a large account balance with the start of fixed withdrawals, the exact combination that does the most lasting damage.

The takeaway: sequence risk is generally gentler during accumulation than during withdrawal, but it becomes increasingly important to manage as an investor approaches the point where withdrawals begin.

A Simple Example That Makes the Math Clear

Consider two investors withdrawing a fixed amount annually from an identical starting balance, both earning the same average return over ten years, but experiencing the returns in reverse order of each other.

• Investor A experiences strong returns in years one through five, weaker returns in years six through ten.
• Investor B experiences the exact same set of returns, but in reverse order, weaker years first, stronger years later.
• Because withdrawals are fixed, Investor B sells more shares during the early weak years, permanently reducing the base available to benefit from the later strong years.
• Investor A ends with a meaningfully larger balance than Investor B, despite both earning the same average annual return over the full period.

The takeaway: this example is not a hypothetical edge case, it is the standard mechanism behind sequence of returns risk, and it applies to any withdrawal strategy based on a fixed amount.

Strategies to Reduce Sequence of Returns Risk

A few practical approaches reduce exposure to sequence risk without requiring an investor to predict market direction, which is impossible to do reliably anyway.

• Keep a cash or short-term bond buffer covering one to three years of withdrawals, so a downturn does not force selling equities at depressed prices.
• Use a flexible withdrawal rate that adjusts down slightly during a downturn rather than a fixed amount regardless of market conditions.
• Reduce equity exposure gradually in the years immediately before withdrawals begin, rather than making one large allocation shift at a single point in time.
• Diversify across asset classes and geographies so a single market's downturn does not dictate the entire portfolio's sequence risk exposure.

The takeaway: none of these strategies eliminate sequence risk entirely, but each one reduces how much a single bad stretch of years can permanently damage a portfolio's long-term outcome.

How This Applies Beyond Retirement Withdrawals

Sequence risk is usually discussed in the context of retirement, but the same mechanics apply anywhere money moves in or out of a portfolio tied to market performance. A business drawing down an investment account for operating expenses faces the identical dynamic.

Even dollar-cost averaging into a portfolio during accumulation carries a mild version of sequence considerations, since the specific months contributions land in shape the average purchase price achieved, though this version of the risk is far gentler than withdrawal-phase sequence risk.

Endowments, foundations, and any institution funding regular spending from an investment portfolio face the same dynamic as an individual retiree, and many of the same mitigation tools, spending buffers and flexible payout rates, were originally developed in that institutional context before becoming standard retirement planning advice.

The takeaway: sequence of returns risk applies to any portfolio with cash flows tied to market timing, not just retirement accounts, and recognizing that widens where the concept usefully applies.

Building Sequence Risk Into a Portfolio Plan

The practical response to sequence risk is not trying to predict when a downturn will occur, an impossible task, but building a plan resilient enough to withstand a downturn landing at the worst possible time, since that is the scenario that does the most damage.

Stress-testing a withdrawal plan against a hypothetical early downturn, not just an average return assumption, gives a far more realistic picture of how a portfolio would actually hold up, and that realistic picture is what should drive asset allocation and withdrawal rate decisions.

Revisiting the plan periodically matters as much as building it in the first place. A withdrawal rate and asset mix that looked resilient five years ago may no longer fit a portfolio's current balance, spending needs, or remaining time horizon, so sequence risk planning works best as an ongoing review, not a one-time exercise.

The takeaway: plan for the worst plausible sequence, not just the average one, since sequence of returns risk means the average case is not actually the case that matters most.