Author: Amit Verma – AMFI-Registered Mutual Fund Distributor (ARN-349400)
Reading time: 18–22 minutes
⚠️ Important Disclaimer – Please Read First
Mutual fund investments are subject to market risks, including the possible loss of principal. This article is purely educational and does not constitute investment advice, recommendation, or solicitation. Do not make any redemption or fund-switching decisions based solely on this content. Past performance is not indicative of future results. Actual returns may be higher, lower, or negative.
Investment decisions must be based on your complete personal financial situation, risk capacity, risk tolerance, time horizon, goals, and liquidity needs, after proper assessment by a registered professional. For a personalised, objective review of your portfolio, consult an AMFI-registered mutual fund distributor.
The Sentence I Hear Every Month
“I’ve already put ₹9 lakh into this fund over five years. It’s been disappointing, but I can’t sell now, I need to at least wait until I break even.”
In my work as an AMFI-registered Mutual Fund Distributor, I hear some version of this almost every week. Sometimes the fund in question has consistently underperformed its benchmark for four years. Sometimes it belongs to a category that no longer fits the investor’s risk profile or time horizon. Sometimes the investment thesis that drove the original decision is simply no longer valid.
But the investor stays. Not because of data or logic, because of the money already spent.
This is the sunk cost fallacy in action, and it is one of the most expensive psychological traps in long-term investing. It is quiet, it is pervasive, and it masquerades as prudence. “Patience” and “staying the course” are genuinely important investing virtues, but they become destructive when they are actually just rationalised reluctance to admit a past decision was wrong.
This article breaks down what the sunk cost fallacy actually is, why it has such a powerful grip on mutual fund investors specifically, the real financial damage it causes over time, and a practical framework for making clear-headed decisions about the funds you hold.
What the Sunk Cost Fallacy Actually Means
The term comes from economics, but the phenomenon is purely psychological.
A sunk cost is any resource, money, time, or effort, that has already been spent and cannot be recovered. By definition, it should have no bearing on future decisions. The rational question when evaluating any investment is not “how much have I already put in?” but “going forward, does this investment give me the best chance of reaching my goals?”
The sunk cost fallacy is what happens when the past investment does influence future decisions, when you keep holding, contributing to, or delaying action on an investment not because of its forward-looking merit, but because walking away feels like acknowledging that the money already spent was wasted.
The sunk cost fallacy in investing causes investors to continue a strategy because of their reluctance to forego the capital, time, and effort already invested, even when rational analysis clearly suggests a different course would serve them better.
It sounds simple when stated that way. But in practice, under the weight of real money and real emotions, it is extraordinarily difficult to avoid.
Why Mutual Fund Investors Are Especially Vulnerable
The sunk cost fallacy shows up in many areas of life, people stay in unsatisfying careers because of the years invested, finish books they are not enjoying because they have already read half, continue watching a series that has gone downhill because of the prior seasons watched. In each case, the logic is the same: past investment justifies continued investment.
In mutual fund investing, several specific features make the fallacy even more powerful:
The waiting-to-recover trap.
Unlike stocks, mutual fund investors cannot see a clear “price” in the way a stock has a visible market price at every moment. But they do remember the original NAV at which they invested. When the current NAV is below that, or when the fund has simply failed to grow as hoped, the desire to “get back to where I started” becomes deeply felt. This “break-even bias” keeps investors frozen, waiting for a recovery that may or may not come in the timeframe they need.
Long holding periods normalise mediocrity.
A salaried professional who started a SIP five years ago, checks it once a year, and sees it underperforming can easily rationalise: “It’s a long-term fund, I shouldn’t judge too quickly.” The advice to be patient, which is genuinely correct for volatility-driven short-term underperformance, gets misapplied to justify structural, persistent underperformance that has nothing to do with market cycles.
Loss aversion intensifies the feeling.
Decades of behavioural finance research confirm that losses feel psychologically about twice as painful as equivalent gains feel pleasurable. Selling an underperforming fund at a loss, or below an imagined break-even, triggers that loss-pain acutely. So the brain keeps finding reasons to wait.
Emotional attachment to past decisions.
There is a human tendency to view past decisions as part of our identity. Selling a fund you chose years ago can feel like admitting the person you were back then made a mistake. For many investors, that feels worse than the underperformance itself.
Absence of clear goal linkage.
When a fund is not explicitly connected to a specific financial goal with a defined timeline, it is easy to justify holding it indefinitely. “It’s just part of my portfolio” becomes the reason to do nothing.
The Real Financial Cost of Staying Too Long
This is where the sunk cost fallacy stops being an interesting psychological concept and becomes a genuine wealth problem.
Research has shown that investors who held onto losing investments purely out of sunk cost bias underperformed the market by 4.7% annually, and over a twenty-year period, that gap destroys a substantial amount of accumulated wealth.
To understand why, consider the arithmetic. If a suitable fund for your goal earns an average 11% annually and the fund you are holding because of sunk cost reasoning earns 7%, the difference over 15 years on ₹10 lakh is roughly ₹27 lakh versus ₹55 lakh, a gap of nearly ₹28 lakh from a single portfolio decision.
The sunk cost fallacy does not just cost you the direct returns you missed. It carries several compounding costs:
Opportunity cost – every year the money stays in an underperforming fund, it is not in a better-suited one. This is not a hypothetical cost; it is real wealth that fails to materialise.
Goal timeline slippage – a retirement corpus planned for 20 years, growing at 7% instead of 10%, may need 4–5 additional working years to reach the same target. A child’s education fund that misses by 2% annually may be lakhs short when the admission time arrives.
Increasing misalignment with life stage – a fund that was appropriate at 32 may be poorly aligned at 45. If sunk cost thinking prevents the necessary shift from high-equity to more balanced or conservative categories as retirement approaches, the investor faces not just return underperformance but active risk mismatch.
Emotional and psychological cost – watching a lagging fund month after month is genuinely stressful. It erodes confidence in investing itself, sometimes causing investors to reduce their overall investment activity or make other reactive, emotional decisions elsewhere in their portfolio.
Recognising the Sunk Cost Fallacy in Your Own Portfolio
The first step to addressing this bias is recognising when it is operating. Here are the clearest signals:
You are waiting to “break even” before taking any action.
The original investment amount or NAV has become your reference point for future decisions. If you find yourself thinking “I’ll switch once the value gets back to what I put in,” sunk cost thinking is driving the decision rather than goal alignment.
You defend the fund based on past performance, not current or forward-looking merit.
“This fund did well in 2019 and 2020” is a backwards-looking defence. “This fund’s current management team, portfolio construction, and benchmark alignment give me confidence in future performance” is forward-looking. Ask yourself which frame is guiding your thinking.
You have not linked this fund to a specific goal.
If you cannot answer “this fund is part of my plan to achieve X by year Y,” the fund is floating without purpose, and purposelessness enables inertia.
You have not evaluated the fund against its appropriate benchmark for 3+ years.
Short-term underperformance can be noise. Three to five years of consistent underperformance against a fund’s own benchmark and category peers is signal.
You are aware the fund no longer fits your current risk profile or time horizon – but you have not acted.
This is perhaps the purest form of the sunk cost fallacy: knowing the fund is wrong for you today, but staying because of what you put in yesterday.
A Practical Framework for Breaking Free
The good news is that the sunk cost fallacy, once clearly identified, is addressable. The framework below is not about abandoning patience or acting on short-term market noise – it is about making decisions on the right basis rather than the wrong one.
Step 1: Ask the Forward-Looking Question
Whenever you are evaluating a fund you hold, replace the default question with a better one.
Default question (backward-looking): “How much have I already invested, and how much would I lose if I sold now?”
Better question (forward-looking): “If I were investing fresh money today for this specific goal, with its current timeline and risk requirement, would I choose this fund – or would I choose something different?”
This one substitution cuts through most of the emotional noise. If the honest answer is “I would not choose this fund today,” the sunk cost fallacy is what is keeping you there, not rational analysis.
Step 2: Link Every Fund to a Specific Goal
A fund without a purpose is easy to hold indefinitely through inertia. A fund with a clearly stated purpose, “this is my 14-year retirement corpus fund” or “this is my 7-year child’s education fund”, can be evaluated against that purpose.
Ask: does this fund’s current characteristics (risk level, category, time horizon suitability, recent performance vs benchmark) still serve this goal? If not, what does?
Step 3: Define Your Review Criteria in Advance
One of the most powerful antidotes to emotional decision-making is deciding, before the emotion arises, what conditions would trigger a review or change.
For example: “I will initiate a serious review of any fund that has underperformed its benchmark by more than 3% annually over 3 consecutive rolling years” or “I will review category allocation whenever a goal moves within 5 years.”
These pre-defined criteria remove the in-the-moment emotional calculations. When the criteria are met, a review happens, not because of fear or hope, but because of a pre-agreed process.
Step 4: Separate Short-Term Volatility from Structural Underperformance
Not all underperformance is sunk cost territory. A fund that lags its benchmark by 2% in a single year, in difficult market conditions, may be doing exactly what a well-managed fund should do in that environment. Patience here is genuinely virtuous.
Structural underperformance is different: consistent lag across multiple market cycles (not just one bearish phase), significantly worse returns than category peers over 3–5 years, or a fundamental change in the fund’s management, strategy, or category alignment. This is when the “wait for recovery” instinct becomes the sunk cost fallacy.
The 3-year rolling return comparison against the fund’s benchmark and category peers, available on platforms like Value Research or Morningstar India, is your clearest tool for distinguishing noise from signal.
Step 5: Focus on Marginal Contribution Going Forward
The most elegant way to think about this: the money already invested is gone from your future decision. It cannot be recovered whether you stay or go. The only thing that remains is the decision about where that corpus should live from today forward, in this fund, or in a more suitable one.
This frame turns a psychologically painful “I’m cutting my losses and accepting failure” into a straightforward “I’m directing my existing corpus to its best future use.” The money did not fail. Your original choice was reasonable with the information you had at the time. You are simply making a better-informed choice now.
Step 6: Act in Steps if Needed
For those with large positions in underperforming funds, an abrupt full exit can feel extreme and trigger regret. Gradual reallocation, shifting portions over 3–6 months while redirecting new SIP contributions to the replacement fund, can be both practically sensible and psychologically manageable.
This staged approach does not compromise the financial logic (you are still redirecting money to better-aligned options), and it reduces the emotional friction that can cause analysis paralysis.
What This Does NOT Mean
Clarity on one side requires clarity on the other.
It does not mean selling at the first sign of underperformance.
A quality fund going through a difficult 12-month period in a specific market cycle is not a candidate for exit. Patience through appropriate volatility is a genuine virtue.
It does not mean chasing recent outperformers.
The antidote to sunk cost thinking is not its mirror image, switching to whatever performed best recently. Chasing recent performance is a different behavioural bias (recency bias), and it is equally destructive.
It does not mean avoiding all accountability to past performance.
A fund with a genuinely strong long-term track record, consistent with its benchmark and peers over many years, that is going through a short rough patch, deserves patience, not dismissal.
The framework here is about making decisions on the right basis: forward-looking goal alignment, appropriate category and risk profile, and objective benchmark comparison, rather than on the emotionally distorting basis of what you have already spent.
When Behavioural Bias and Rational Action Align
Here is an encouraging reality: in many cases, the sunk cost fallacy does not require dramatic portfolio surgery. Sometimes the right review simply confirms that a fund still makes sense, the underperformance was temporary, the management team is still strong, and the goal alignment is intact.
The value of going through the process is not always that you change something. It is that the decision to stay or change is now made on sound reasoning rather than on inertia or emotional attachment. A portfolio where every holding has been consciously evaluated and purposefully maintained is psychologically much more stable than one maintained through avoidance.
That psychological stability itself has real financial value, investors who understand why they own what they own are significantly less likely to make panic-driven decisions during market corrections.
Frequently Asked Questions
How do I know if a fund has truly underperformed or is just going through a temporary rough patch?
Compare it against its benchmark and category peers using 3-year and 5-year rolling return data, not just a single calendar year snapshot. Consistent underperformance across different market conditions over 3+ years is a signal worth taking seriously. A difficult single year in a specific market environment is often noise.
Should I always exit a fund the moment it underperforms its benchmark?
No. One-year benchmark underperformance is not sufficient evidence of a structural problem. Evaluate over 3–5 year rolling periods. Also consider whether the underperformance is due to market conditions affecting the whole category, or specific to this fund’s stock selection and management.
Is there a tax implication when I switch funds?
Yes, redemption triggers capital gains tax. For equity funds held over 12 months, LTCG above ₹1.25 lakh is taxed at 12.5%. Short-term gains (under 12 months) are taxed at 20%. For debt funds purchased after April 2023, all gains are taxed at slab rate. Tax implications should be factored into the timing and structure of any reallocation, ideally in discussion with a Chartered Accountant.
What if I am sitting on a significant loss in a fund – is it still worth switching?
The sunk cost question applies directly here. The loss is already a financial reality regardless of whether you sell. The relevant question is whether the corpus currently deployed in this fund is best placed there going forward, or better placed in a fund more aligned with your goal. Sometimes the answer genuinely is to stay, if the fund’s forward outlook is sound. Sometimes it is to move. Tax loss harvesting (booking the loss to offset future gains) is also a consideration worth discussing with a professional.
How often should I review my portfolio for this kind of assessment?
An annual review is the standard recommendation, sufficient to catch meaningful changes without creating the noise-reaction problem of reviewing too frequently. The annual review, ideally done with a registered distributor, is when sunk cost situations are most clearly identified and addressed.
Is the sunk cost fallacy the same as being patient with a volatile market?
No, and this distinction is important. Patience through market volatility, staying invested during a Nifty correction while your long-term equity fund temporarily declines, is rational and often rewarded. The sunk cost fallacy is staying in a fund that has structural problems, poor relative performance, or a mismatch with your current goals and life stage, not because of confidence in its forward potential, but because of reluctance to acknowledge the money already spent.
Final Thought: What You Have Already Spent Cannot Be Unlocked by Waiting
The sunk cost fallacy is not a sign of irrationality or weakness. It is a profoundly human response, rooted in psychological mechanisms that serve us well in many contexts and badly in this one. Almost every investor has experienced it at some point.
The bias of the sunk cost fallacy can have long-term implications on your financial wellbeing, causing you to remain invested in a product offering little return simply because you have already invested so much in it.
Awareness of the bias is the first and most important step out of it. When you recognise that the money already invested is gone regardless of your next decision, and that the only meaningful question is what gives your remaining corpus the best chance of reaching your goals from today, the trap loses most of its power.
A quality portfolio review, done objectively and linked clearly to your actual goals and timelines, is often all it takes to identify the funds where sunk cost thinking has been the real reason for staying. Once identified, the path forward is usually clear.
If you have been holding funds for years based more on what you have already put in than on what they are likely to deliver going forward, it may be time for that review.
Get a Professional Portfolio Review
An objective review of your mutual fund portfolio, looking at every fund against its appropriate benchmark, its goal alignment, and your current life stage, is one of the highest-value conversations I have with investors.
If you suspect that some of your holdings are being maintained for the wrong reasons, I am here to help you look at them clearly.
📧 planwithmfd@gmail.com 🌐 mfd.co.in 📱 +91-76510-32666
Regulatory Disclosure
🚨 Educational Content Only – Important Disclaimer
AMFI-Registered Mutual Fund Distributor (ARN-349400) – Not a SEBI-Registered Investment Adviser
This content is for educational and informational purposes only. It does not constitute investment advice, a specific recommendation to redeem or switch any fund, or a guarantee of future performance. Mutual fund investments are subject to market risks, including the risk of loss of principal. Past performance is not indicative of future results.
Tax treatment referenced is current as of April 2026 and is subject to change. Consult a qualified Chartered Accountant for personalised tax guidance.
Every investor’s situation is unique. Any decision to redeem, switch, or continue holding a mutual fund should be made after proper assessment by a registered professional who understands your complete financial picture.
For personalised guidance, consult a SEBI-registered investment advisor or an AMFI-registered mutual fund distributor.
ARN-349400 (verify at amfiindia.com). As an AMFI-registered distributor, I act in accordance with the AMFI Code of Conduct, which requires me to act in the best interest of investors and avoid conflicts of interest. I may receive commissions on investments made through me, included in the scheme’s Total Expense Ratio (TER) and not charged separately. Commission rates vary by fund house and scheme, full details available on request.
Mutual Fund investments are subject to market risks. Please read all scheme-related documents carefully before investing.
