Taking profits: when to sell and how to decide

Taking profits sounds like the easiest decision in investing. You bought shares. They went up. You sell them and pocket the difference. Job done.

If only it worked that way.

The reality is that selling is one of the hardest things an investor does, often harder than deciding what to buy in the first place. The moment you sell, you lock in your gain and you also lock in your regret if the share carries on rising. The fear of leaving money on the table is a genuine psychological force, and it catches out experienced investors as well as beginners.

Understanding why selling is difficult is the first step to getting better at it.

The emotional trap that keeps investors holding on. When a share rises significantly after you buy it, something strange happens. The gain starts to feel like it belongs to you, even though you have not actually received it yet. This is sometimes called the endowment effect: we place extra value on things we already own. The unrealised profit feels real, so losing part of it feels like a genuine loss, not just a smaller gain.

This creates a paralysis. You do not want to sell at £4.50 in case it reaches £5.00. Then at £5.00 you wait for £6.00. Then at £6.00 the share drops back to £4.00 and you have missed the exit you meant to take. Recognising this pattern will not make it disappear entirely, but it does make it easier to act when you have a clear plan to fall back on.

Setting a target before you buy is the single most practical thing you can do. Decide on a target price or target return before you invest, not after the price has already moved. If you buy shares at £2.00 and decide you would be happy taking profits at £2.80, that 40 per cent return should be your trigger to at least reassess. You do not have to sell the entire position, but you should ask yourself: would I buy this share today, at this price, with the information I now have? If the answer is no, selling at least some of your holding is worth considering.

This forces the decision back to fundamentals rather than emotion. It also helps to separate the money you have made from your original investment in your mind. Your original stake is what you put in. The gain above that is the market’s payment to you for being right. Both deserve protection.

Taking profits in stages is often easier than trying to call a top. Many investors find it easier to sell a portion of a winning position rather than all of it in one go. If you hold 500 shares and the price has risen 50 per cent, selling 200 of them locks in a meaningful gain while leaving you exposed to further upside. This approach is sometimes called scaling out.

The practical benefit is psychological. You have done something, which reduces the anxiety of doing nothing while the price moves around. You still have skin in the game, which means you will not feel you sold too early if the shares continue to climb. And you have cash in your account, which can be put to work elsewhere. The drawback is that it requires discipline to actually execute the second and third tranches rather than letting the remainder run indefinitely and finding yourself back at square one.

Sometimes the best reason to sell has nothing to do with the price at all. Companies change. Management teams change. Markets shift. If the reason you bought a share in the first place no longer holds, the original case for owning it has gone, and you should be willing to sell regardless of whether you are sitting on a gain or a loss.

This is harder than it sounds because we tend to anchor to our entry price. If you paid £3.00 and the shares are now at £4.50, it feels wrong to sell because you believe the company has changed for the worse. The profit clouds the judgement. But the question is always the same: knowing what you know now, would you buy this company today? If the honest answer is no, the profit is an irrelevance.

UK investors holding shares outside an ISA need to keep capital gains tax in mind. In the 2024/25 tax year the annual CGT exemption fell to £3,000, down from £12,300 just two years earlier. That is a significant reduction, and it means more gains are now potentially taxable. The CGT rate on shares is 18 per cent for basic rate taxpayers and 24 per cent for higher rate taxpayers from October 2024.

This does not mean you should let tax dictate your investment decisions, but timing a sale across two tax years or making full use of your ISA allowance before gains crystallise can make a material difference. If you are close to breaching your CGT exemption, it is worth doing the sums before you sell, or speaking to an accountant. Inside a stocks and shares ISA, gains are fully sheltered from CGT, which makes the ISA the natural home for shares you intend to hold for the long run.

None of this means you should sell every share that rises. Some companies genuinely compound year after year, and selling too early is one of the most common mistakes long-term investors make. There is a reasonable argument that for a high-quality business growing strongly, the best holding period is a long one.

The key is knowing the difference between a share that has run ahead of its fundamentals and a share that is being repriced upward because the underlying business is genuinely getting better. The first is a candidate for taking profits. The second might deserve a longer leash. Getting that distinction right, consistently, is what separates investors who build lasting wealth from those who just get lucky now and again.

TL;DR — the short version

• Selling is psychologically harder than buying because unrealised profits start to feel like money you already own.
• Setting a target return before you invest removes emotion from the decision when the time comes.
• Selling a portion of your holding in stages is often more effective than trying to time a full exit.
• If the reason you bought a share has changed, the case for selling does not depend on whether you are in profit.
• The CGT annual exemption has fallen sharply, so tax-efficient selling now requires more active planning.
• Let genuine long-term compounders run, but do not confuse a share that has outrun its fundamentals with one that is actually getting better.

Disclaimer: The value of investments can go down as well as up, and you may get back less than you invest. This article is for informational and educational purposes only and does not constitute financial advice. Always do your own research and consider seeking independent advice before making any investment decision.