When people first start investing, most of their attention naturally goes to buying: what to invest in, when to begin, and how much money to put into the market. Selling often gets much less attention, even though it is exactly where many decisions with a major impact on long-term returns are made. That is why it is useful to understand why holding investments is often a better choice than frequent trading.
From a long-term investor’s perspective, selling is not inherently good or bad. The key question is why. If holdings are sold because the market is volatile, the news feels unsettling, or a temporary drop in the portfolio feels uncomfortable, that sale can break the investment plan at the very moment when sticking to it matters most. If, on the other hand, the sale is based on a genuine pre-planned need or a deliberate change in strategy, it can be entirely sensible.
Long-term investing is built on making time work for you
When people talk about simple, low-cost investing, the underlying idea is usually that the investor benefits from long-term market growth without constantly trying to time market moves. That only works if investments are left alone.
Investment returns do not arrive evenly. The best market days, months, and years are unevenly distributed, and there is no reliable way to identify them in advance. If an investor sells every time uncertainty rises and only returns to the market once things feel safe again, they may miss exactly the periods when a large share of long-term returns is made.
That is one of the main reasons long-term investors do not benefit from constant selling. Portfolio returns are not built only on owning the right investments, but also on owning them for long enough.
Selling interrupts the compounding effect
One of the most important principles in long-term investing is compounding. In practice, this means that the return on an investment begins to generate additional returns over time. The longer the investment horizon, the more powerful this becomes.
When holdings are sold unnecessarily, that chain is interrupted. The money may sit in cash waiting for the next decision, or it may only be reinvested later. Even if the pause is short, the investor takes on the risk of missing part of a market recovery. More importantly, frequent buying and selling can make investing driven by decisions in the moment rather than by a plan.
For long-term investors, the best decisions are usually not the ones made most often, but the ones that only need to be made occasionally and with care.
Taxation often makes unnecessary selling inefficient
Many beginners do not immediately realise that selling can also be tax-inefficient. When an investment is sold at a profit, that gain is realised and may trigger taxes. In practice, that means part of the return is taken out of the investment process through taxation.
If the investor had simply continued holding the investment, the full capital could have remained invested and continued growing. Deferring taxes may not sound especially significant at first, but over the long run it can make a clear difference. Every euro that does not yet go to the tax authorities can keep compounding.
This does not mean profitable investments should never be sold. It means there should be a sound reason for selling. Simply thinking, “That’s a decent gain, maybe I should lock it in,” is not, by itself, a strong reason to sell if the money is going to be reinvested in something similar anyway.
A loss only becomes real when the holding is sold
One of the most common challenges for long-term investors is that a falling market feels very different from a rising one. When a portfolio is down, it can feel as though money has already been lost for good. But that is not usually the case yet. As long as the holding has not been sold, what you are looking at is a paper loss, not a final realised loss.
The actual loss is only realised when the investor sells at a lower price than they originally paid. That is exactly why a rushed sale during a market decline is often so damaging: it turns a temporary drop in value into a permanent loss. After that, the investor no longer owns the units or shares that might later recover in value.
This is especially relevant in broadly diversified index investments. If a holding is widely diversified, low-cost, and built for the long term, a short-term drop in value is not usually a reason to sell in itself. More often, it is simply a reminder of what investing really looks like.
A practical example: two ways to respond to a market decline
Imagine two investors who both own the same global equity index fund. Both have been investing monthly for several years, and each portfolio has grown to €20,000.
The market then falls quickly by 20 percent. The value of both portfolios drops to €16,000. The first investor panics, sells their holdings, and moves into cash. At that point, the €4,000 decline turns into a realised loss for them, or at the very least a realised reduction in value compared with the portfolio’s earlier level, because the holding has been sold. The second investor does nothing and continues investing as usual, for example €300 a month.
Now assume the market recovers over the following year and returns to its previous level. The first investor does not buy back in immediately, but waits until things look safe again. They only re-enter once the fund has already climbed back to its starting level. Because they sold earlier at €16,000 and left the money on the sidelines, their portfolio is still worth €16,000 at the time of the recovery. In other words, they remain €4,000 behind the previous €20,000 level unless they invest more money.
The second investor, by contrast, keeps investing throughout. If they invest €300 a month for 12 months during the decline and recovery, they add a total of €3,600. That means they have €23,600 of their own money in the market by the time the recovery is complete: the original €20,000 plus the €3,600 added during the year. Once the market has returned to its earlier level, the original portfolio has also recovered back to €20,000. On top of that, the monthly purchases made during the downturn were bought at lower average prices, so by the time the market recovers, those purchases are typically worth more than the €3,600 invested.
To keep the example simple, suppose those additional €3,600 invested during the downturn have grown to around €4,200 by the time the recovery is complete. In that case, the second investor’s portfolio is worth about €24,200. The first investor’s portfolio, at the same point, is still worth €16,000 if they have not added new money. The gap between the two is therefore about €8,200.
The second investor was not necessarily braver or more skilful. They simply had a better process. Rather than trying to solve uncertainty by selling, they accepted it as part of investing. That is often what long-term discipline really comes down to.
Selling is tempting because it feels like taking action
One of the hardest things about investing is accepting that doing nothing is often a better response than reacting. Selling can feel like taking control. It creates the sense that something has been done.
The problem is that markets do not reward activity in itself. What they tend to reward is sound decision-making, discipline, and time. Unnecessary activity can increase the number of mistakes without improving returns.
That is why long-term investors benefit from holding sales to an even higher standard than purchases. Buying can begin a good plan. Selling can just as easily derail it.
Common misconceptions about selling
“Once you have a profit, you should take it”
This sounds sensible, but in long-term investing it is not automatically a good rule. A good investment does not become a bad one simply because it has gone up in value. If the holding still fits the plan, continuing to hold it may make more sense than cashing out the gain.
“If an investment falls, you should get rid of it quickly”
That depends entirely on what you own. Selling may be justified in the case of a weak individual company. But with a broadly diversified index fund, a decline does not usually mean the investment thesis has broken. More often, it simply means markets move.
“I’ll sell now and buy back in cheaper”
The idea is appealing, but in practice it requires two successful timing decisions: when to sell and when to buy back in. One mistake is enough to weaken the outcome. For most long-term investors, this is neither a realistic nor a necessary strategy.
“A good investor acts quickly”
In many areas of life, speed is an advantage. In long-term investing, however, reacting quickly is not usually the same thing as making a good decision. A better question is whether the decision was part of a plan or simply an emotional reaction.
When can selling make sense?
Saying that long-term investors usually should not sell does not mean they should never sell. There are at least three situations where selling may be justified.
The first is when your plan or asset allocation changes. If you deliberately want to reduce the risk level of the portfolio, selling can be part of that process. For example, you might reduce your equity allocation and increase bonds or cash if your investment horizon has become shorter.
The second is when the purpose of the money changes. If invested assets will be needed in the next few years for a home purchase, studies, a business venture, or some other clearly defined purpose, reducing risk and selling may be sensible. In that case, the sale is not a reaction to the market but a response to the fact that the role of the money has changed.
The third is when the investment plan includes a gradual shift, for example from accumulation-focused holdings to income-producing ones, or more broadly to a more stable structure. That kind of selling is very different from pulling out because of market fear. It is planned.
In addition, with individual stocks there may be situations where the original investment case no longer holds. For beginners, this is one reason broadly diversified index investing is often a simpler and safer starting point. When your holding represents the market as a whole rather than the fortunes of a single company, there are usually fewer situations that call for selling.
Summary
Long-term investors usually should not sell their holdings, because a large share of investing success comes from time, discipline, and compounding. Unnecessary selling can interrupt the growth of returns, trigger taxes, lock in losses, and leave the investor on the sidelines during a recovery.
The key point is not that holdings should be kept at all costs. The real point is that selling should be based on a plan, not on a passing emotion. In long-term investing, the best decisions often look quite ordinary: keep costs low, diversify, invest consistently, and avoid unnecessary adjustments.
What is worth remembering?
- For long-term investors, returns often depend more on how long they stay invested than on frequent buying and selling.
- Unnecessary selling can hurt results through taxes, lost time in the market, and emotionally driven mistakes.
- A market decline alone is not a good reason to sell a diversified long-term investment.
- Selling can make sense when your plan, risk level, or intended use for the money changes.
- A good investment plan reduces the need to make difficult decisions precisely when emotions are strongest.