We have some exciting news to share! The Motley Fool UK has now become The Twelfth Magpie -- an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. This site is our new home, and there will be extra tweaks made across the coming few days as we settle in. So if anything looks a little off, please bear with us!

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

Want to become an ISA millionaire? Know when to sell shares!

Holding quality shares in a tax-efficient ISA increases your chances of becoming rich. So too does knowing when to sell your duds.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

Here at the Motley Fool UK, it’s our belief that buying high-quality shares and holding them within a tax-efficient ISA can dramatically improve your wealth. With a bit of patience, you could even become a stock market millionaire.

Notwithstanding this, there will very likely be times in any investment career when it makes sense to sell a stock. Here’s are three reasons for doing so.

XXX

The story has changed

It’s remarkably easy to fall in love with a particular share, particularly one you’ve devoted time to thoroughly researching.

Sadly, nothing is guaranteed in the market, regardless of how good the company’s story is. Today’s dream stock can quickly become a nightmare if events (internal, external, or both) go against it. The key is learning to distinguish a major setback from a temporary hurdle.

One might argue that the investment case for travel stocks has dramatically changed in 2020 due to the pandemic. Even when the coronavirus cloud does finally lift, some companies’ share prices may remain stagnant for a long time afterward due to the financial damage they’ve endured.

A good example from a different sector would be Lloyds Bank – one of the most popular stocks with retail investors.

Despite making it through the financial crisis, anyone backing the shares in March 2009 won’t have made much money since (dividends excluded). Had they switched to technology stocks, however, the outcome would have been very different.

The price is too high

Great shares are seldom without friends and rarely cheap as a consequence. What’s more, the very best of the best just go on getting more expensive as they continually beat expectations. This explains why top UK fund manager Terry Smith thinks there are more important things to focus on than the price you pay for a stock. 

Then again, there will be times when a share price becomes so utterly detached from a company’s fundamentals that taking at least some money off the table feels like the right thing to do (especially as you won’t pay tax on capital gains if it is held within an ISA). An example of this might be when a company is hyped beyond belief but has yet to make a profit.

Even if a stock’s prospects really are great, it will take time for these to be realised. Will all investors be prepared to hold and wait? I doubt it. 

You’ve made a mistake

Few active ISA investors are able to strike it rich without making a few/a lot of mistakes along the way. This may be the result of acting too cautiously, recklessly, or simply picking a stock that didn’t work out.

Regardless of the reason, admitting that you’ve made a mistake can be hard. This is why we cling to losing stocks even when there’s little chance of recovery. Even if a company is able to turn things around, the numbers might still be against you. Being 50% down requires a share to double in value just to get you back to break-even.

Now, that sort of move isn’t impossible, particularly in illiquid small-cap stocks, but it can take a while if it comes at all. In the meantime, other companies are making great money for their investors.

The opportunity cost of staying invested in a loser can often be greater than accepting the loss and learning from it. 

Paul Summers has no position in any of the shares mentioned. The Motley Fool UK has recommended Lloyds Banking Group. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Friends and sisters exploring the outdoors together in Cornwall. They are standing with their arms around each other at the coast.
Investing Articles

£503 buys 14 shares in this FTSE 250 stock that returned 23.9% annually for the last 15 years

This FTSE 250 stock has averaged a huge return for 15 years. At today's price, £503 buys 14 shares. But…

Read more »

Black woman using loudspeaker to be heard
Investing Articles

£1,000 buys 25 shares in this FTSE 100 stock that’s returned 29.2% annually for the last 10 years

This FTSE 100 mining stock has returned close to 30% a year for a decade. At 3,995p, £1,000 buys 25…

Read more »

Female student sitting at the steps and using laptop
Investing Articles

Down 47%, is this growth stock finally worth buying in May?

With a £288m order book and a hidden pipeline of defence and nuclear contracts, is this growth stock now too…

Read more »

House models and one with REIT - standing for real estate investment trust - written on it.
Investing Articles

2 REITs yielding 7%+ to consider for passive income in 2026

A REIT backed by the NHS and another backed by Tesco and Sainsbury's with both yielding 7%+. Here's why I'm…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

Just 97 shares of this UK dividend stock generate £238 in passive income

A 5.7% yield, £238 in passive income from just 97 shares, and one of the most divisive dividend stocks on…

Read more »

ISA coins
Investing Articles

£10,000 in an ISA generates a second income of…

The London Stock Exchange is home to some of the world's most generous dividends. But how big a second income…

Read more »

Shot of a senior man drinking coffee and looking thoughtfully out of a window
Investing Articles

Expert recommendations: 2 top income stocks yielding 7%+!

With yields of 7.2% and 7.8% respectively, these two income stocks are catching the eyes of institutional analysts. Should investors…

Read more »

Illustration of flames over a black background
Investing Articles

3 top income-focused stocks to buy in May 2026, according to experts

Looking for a stock to buy for income in May 2026? Experts have flagged these three UK dividend shares as…

Read more »