Every year, DALBAR publishes its Quantitative Analysis of Investor Behavior, tracking the returns that the average investor actually earned compared to the returns their funds delivered. Every year, the gap is substantial. Over the twenty years ending in 2022, the average equity fund investor earned approximately 6% annually while the funds they held returned approximately 9.8%. The difference is not fees, though fees matter. The difference is behavior: buying after markets rise and selling after they fall.
Behavioral finance is the field that explains why intelligent, rational-seeming people make systematically poor financial decisions. The findings of behavioral economists like Daniel Kahneman, Richard Thaler, and Robert Shiller have transformed our understanding of how financial decisions are actually made, as opposed to how an idealized rational actor would make them. The biases they identified are not quirks of uninformed investors. They affect everyone, including financial professionals.
For retirement investors, the behavioral stakes are uniquely high. Retirement savings represent decades of work. The decisions made in a few emotionally intense moments, a sharp market decline, a media panic, a neighbor's alarming story, can undo years of disciplined accumulation. Understanding the specific biases most likely to harm retirement outcomes, and having structural defenses against them, is as important as any investment strategy.
This paper covers the most consequential behavioral biases for retirement investors, the documented cost of behavioral errors in the aggregate, the structural defenses that reduce behavioral risk, and the role of a skilled advisor in managing the behavioral dimension of retirement planning.
The behavioral risks in retirement investing are highest during periods of elevated market volatility and uncertainty, which describes the environment many investors have experienced in the mid-2020s. Interest rate cycles, geopolitical uncertainty, equity valuations at historically elevated levels, and a media environment optimized for engagement through alarm create a behavioral pressure cooker that produces poor investment decisions.
Retirees and near-retirees face particularly acute behavioral pressure because the stakes feel concrete and immediate. A 35-year-old who sells equities in a panic has twenty or thirty years to recover the mistake through continued contributions and market recovery. A 65-year-old who sells in a panic has fewer recovery years, may not be making additional contributions, and may lock in losses at precisely the moment they most need the portfolio to sustain income.
Daniel Kahneman and Amos Tversky's prospect theory, for which Kahneman received the Nobel Prize in Economics in 2002, established that losses feel approximately twice as painful as equivalent gains feel pleasurable. A $10,000 portfolio loss creates roughly twice the emotional impact of a $10,000 gain. This asymmetry drives the most common costly behavior: selling after losses to stop the psychological pain.
Loss aversion is not irrational in isolation. Avoiding losses is generally a good instinct in many domains of life. The problem is that in long-term investment portfolios, temporary losses that feel permanent cause real permanent harm when they trigger selling. A 30% portfolio decline that recovers in three years causes no lasting damage if the investor holds. It causes permanent damage if the investor sells at the bottom and buys back near the recovery peak.
Recency bias is the tendency to give disproportionate weight to recent events when making predictions about the future. Investors who experience a prolonged bull market begin to expect that markets will continue rising indefinitely. Investors who experience a sharp decline begin to expect that markets will continue falling. Both expectations are unsupported by the historical evidence but feel compelling because recent experience is vivid and emotionally salient.
In retirement planning, recency bias manifests as over-confidence in bullish periods, leading to excessive risk taking near market peaks, and excessive fear in bearish periods, leading to portfolio de-risking near market troughs. Both behaviors reduce long-term returns. The period of maximum fear, when markets are at or near their lows, is precisely the period when long-term investors should be holding or adding to equities, not reducing them.
Herding is the tendency to follow the crowd in investment decisions, driven by the psychological comfort of being wrong in company rather than wrong in isolation. When financial media is dominated by a prevailing narrative, whether bullish or bearish, investors who deviate from that narrative feel exposed and anxious even if their analysis is sound.
Herding concentrates investment inflows and outflows at precisely the wrong times. Large fund inflows tend to occur after strong market performance, when prices are relatively high. Large outflows tend to occur during or after market declines, when prices are relatively low. The aggregate behavior of the herd is to buy high and sell low, which is documented in the DALBAR data year after year.
Overconfidence bias leads investors to believe they can predict market direction, identify superior investments, or time market movements better than they actually can. Overconfident investors trade more frequently than is warranted by their actual predictive skill, generating transaction costs and tax consequences while not improving returns. Research consistently shows that more active trading correlates with worse performance, not better, for individual investors.
Mental accounting is the tendency to treat money differently based on its source or intended purpose, rather than evaluating all dollars equally. A common manifestation is treating retirement savings as sacred and unchangeable while simultaneously holding large cash balances or paying down low-interest debt rather than investing. Another is treating investment gains as 'house money' that can be spent on higher-risk bets, when in reality the gains are identical to any other dollar in the portfolio.
Present bias, also called hyperbolic discounting, is the tendency to overweight immediate rewards relative to future rewards, even when the future reward is significantly larger. Present bias is the primary behavioral explanation for inadequate retirement savings: the tangible benefit of spending today is weighted more heavily than the abstract benefit of retirement security in twenty or thirty years.
Daniel Kahneman and Amos Tversky's landmark 1979 paper 'Prospect Theory: An Analysis of Decision Under Risk,' published in Econometrica, established the theoretical foundation for behavioral finance. Their work demonstrated through controlled experiments that human decision-making under uncertainty deviates systematically and predictably from the rational agent model assumed in classical economics. Loss aversion, probability weighting, and the framing effect were among the key findings that have shaped decades of subsequent research.
Kahneman's 2011 book Thinking, Fast and Slow distilled decades of behavioral research into an accessible framework distinguishing System 1 thinking, fast, automatic, and emotionally driven, from System 2 thinking, slow, deliberate, and analytical. Investment decisions made under emotional pressure are dominated by System 1, which produces the systematic errors documented by DALBAR and others.
Richard Thaler, who received the Nobel Prize in Economics in 2017, and his collaborator Shlomo Benartzi developed the Save More Tomorrow program, which uses behavioral insights to improve retirement savings rates. Their approach uses automatic escalation of savings contributions, triggering increases when pay raises occur, to overcome present bias. Published research on the program showed dramatic improvements in savings rates compared to traditional opt-in contribution increase programs.
Thaler's work on choice architecture, the idea that how choices are presented influences which choices are made, has had practical impact on 401(k) plan design through automatic enrollment and automatic escalation features now required for many new plans under SECURE 2.0.
Robert Shiller's work on market psychology, particularly his book Irrational Exuberance published in 2000 and updated in 2005 and 2015, documented the role of speculative narratives in driving market bubbles and crashes. Shiller argues that markets are substantially driven by social epidemics of popular narratives rather than by fundamental value alone.
His subsequent work on narrative economics examines how economic stories spread through populations and influence economic behavior. For retirement investors, the Shiller framework suggests that the dominant market narrative at any point in time is a poor guide to investment decisions because narratives tend to peak in persuasiveness near market extremes, precisely when their guidance is most dangerous to follow.
Vanguard's Advisor Alpha research framework estimates that behavioral coaching, helping investors avoid the worst behavioral errors, can add approximately 1.5% per year in investment return equivalent for clients who would otherwise exhibit significant behavioral errors during market volatility. This estimate is the largest single component of the Advisor Alpha framework, exceeding the estimated value of asset allocation, tax-loss harvesting, or withdrawal strategy optimization.
The single most common and most costly behavioral mistake for retirement investors is selling equities during or after market declines. This behavior, driven by loss aversion and fear of further losses, locks in declines permanently and positions the investor to miss the recovery. The historical record is clear: equity markets recover from every documented decline. Investors who hold through declines participate in the recovery. Investors who sell do not.
Research by Thaler and others shows that investors who check their portfolios more frequently are more likely to make emotional decisions in response to short-term volatility. Daily or weekly portfolio checking exposes the investor to loss aversion triggers regularly, creating a persistent pressure toward risk reduction or selling. For long-term investors, checking the portfolio quarterly or semi-annually is sufficient and reduces the behavioral noise that drives poor decisions.
Investors consistently allocate more money to funds and strategies that have recently performed well, and withdraw from those that have underperformed. Research from Morningstar and others consistently shows that this behavior produces worse outcomes than simple index investing, because past performance is not predictive of future performance in the short to medium term, and buying after a strong run means buying at higher valuations.
The period of maximum emotional pressure, during a sharp market decline, is precisely the worst time to make major portfolio allocation changes. Changes made during high-volatility periods are almost always driven by emotion rather than analysis, and the decisions that feel most compelling in those moments are typically the ones most likely to cause long-term harm. Having a written investment policy statement that governs allocation decisions in advance removes the temptation to deviate during volatility.
An investment policy statement, developed collaboratively with a financial advisor, documents the strategic asset allocation, the rebalancing triggers, and the specific conditions under which allocation changes are and are not appropriate. Having this document in place before volatility arrives provides a decision framework that doesn't depend on the investor's emotional state in the moment. When everything feels wrong, the policy statement provides the rational anchor.
Automatic rebalancing triggers portfolio adjustments based on rules, not on emotional responses to market conditions. When equities decline and fall below target allocation, automatic rebalancing buys equities at lower prices. When equities rise and exceed target allocation, it sells equities at higher prices. This is the mechanical implementation of buying low and selling high that most investors intend but fail to execute due to emotional interference.
For retirees, maintaining a cash buffer of one to two years of living expenses provides a behavioral as well as financial benefit. A retiree who knows their next two years of income is already sitting in cash can watch equity markets decline without the visceral urgency to sell, because the immediate income need is already addressed. The buffer removes the emotional pressure that drives panic selling.
Vanguard's research shows that behavioral coaching is the highest-value service a financial advisor provides. An advisor who helps a client maintain their investment policy during a severe market decline, preventing a panic sale, delivers value that can significantly exceed years of advisory fees. The value of the relationship shows up most clearly in the moments of maximum stress, which are also the moments when the cost of poor decisions is highest.
If the answer is no, creating this document is a high-priority action item before the next period of market stress.
Knowing the realistic worst-case scenario in advance prepares you emotionally for it. Surprises during downturns are more damaging than anticipated volatility.
This question reveals whether behavioral coaching is a formal part of the advisor's service model or an afterthought.
An honest retrospective on past behavioral errors is valuable input for designing future structural defenses.
Financial risk tolerance measures how much volatility your portfolio can mathematically absorb. Behavioral risk tolerance measures how much volatility you can emotionally absorb without making damaging decisions. The appropriate allocation accounts for both.
The retirement planning calculator at plan.johnkoyle.com was built to model exactly the dynamics discussed in this paper. The Monte Carlo tab in the retirement calculator at plan.johnkoyle.com shows your plan's success rate across 500 possible market scenarios, including the bad ones. Reviewing the full distribution of outcomes, not just the median scenario, is a form of behavioral preparation: understanding in advance what the bad scenarios look like and confirming that the plan survives them reduces the emotional surprise factor during downturns. The Action Plan tab identifies the specific plan adjustments that would most improve resilience, helping you take action on preparation rather than on panic.
John Koyle, AIF®, is the Co-Founder of Red Cedar Wealth Advisors, headquartered in Pocatello, Idaho. He holds the Accredited Investment Fiduciary (AIF®) designation, awarded by the Center for Fiduciary Studies (Fi360), which signifies completed coursework, a rigorous examination, and ongoing continuing education in fiduciary responsibility and prudent investment practices.
John serves individuals and families in or approaching retirement throughout eastern Idaho, the Pacific Northwest, and across the country via Zoom. Clients work directly with John, not a junior team. Red Cedar Wealth Advisors operates under Osaic Wealth, Inc. (Member FINRA/SIPC) and Osaic Advisory Services, LLC for investment advisory services.
Every client relationship is built on five integrated disciplines. The proportions shift with the client and the moment. The integration is constant. Most of the actual value sits in how these disciplines connect, not in any single one of them.
Retirement planning is a discipline that barely existed a generation ago. For most of modern history, people worked until they physically couldn't and then they died, usually fairly close together. The idea that an individual should spend decades saving, then spend decades drawing down those savings, with a plan that accounts for inflation, taxation, sequence risk, healthcare, longevity, and estate transfer, that's maybe forty years old.
Which means almost nobody your age grew up watching their parents do it properly. There's no cultural muscle memory. The advice industry backfilled that gap with rules of thumb that work sometimes and fail catastrophically the rest of the time. The 4% rule. 'You can take Social Security at 62.' 'Target-date funds will handle it.' These are not bad starting points. They are terrible ending points. Real planning is specific, personal, and built on principles that hold up across the full range of outcomes, not just the average one.
The tax code is a set of instructions Congress wrote to shape behavior. Aligning your financial life with those instructions is not aggressive planning. It is the planning. Roth conversion sequencing, capital gains compression on concentrated positions, charitable remainder trusts, Social Security timing, beneficiary coordination. None of these are obscure. They're all legitimate, all written into the code intentionally, and all under-used. Most CPAs handle compliance. The strategy work is a different discipline entirely.
Seventy percent of family wealth doesn't survive two generations. The reason isn't bad markets. The cause is failure to communicate, outdated documents, and no plan for preparing heirs. Beneficiary designations regularly override well-crafted wills. Trust structures created a decade ago no longer match current law or current family. The portfolio that built the wealth isn't the structure that transfers it. The work here is coordinating with your attorney to align documents, beneficiaries, gifting strategies, and trust funding with what you actually want to happen.
Every week, before any portfolio decision, John runs through four layers of market health: economic conditions, market internals, valuations, and sentiment. Each layer gets scored and those scores combine into a composite that maps directly to a portfolio posture, from aggressive on the positive end to defensive on the negative. The work is in the scoring. Once the scoring is done, the positioning follows. That removes one of the most dangerous things in investing: making it up as you go.
The protection gap quietly kills more plans than markets do. A significant net worth paired with inadequate liability coverage is a lawsuit away from a serious problem. Long-term care is more acute: a multi-year care event for one spouse can consume what was meant for the survivor. Most advisors relegate risk to a footnote because insurance conversations are uncomfortable. The math doesn't care. Coverage adequacy, umbrella sizing, long-term care planning, and life insurance structure sit alongside the portfolio in any complete plan.
These are the principles behind every plan John builds.
To begin a conversation, visit johnkoyle.com, use the retirement planning calculator at plan.johnkoyle.com, or reach John directly at john@redcedarwealth.com or (208) 915-8400. Initial consultations are complimentary and carry no obligation.