3 common investing mistakes I think you need to avoid

These three common investing mistakes are easy to avoid, but most investors get caught out by them, says Rupert Hargreaves.

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.

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.

It is relatively easy to make money from the stock market over the long term. Unfortunately, many investors end up making a few critical mistakes over their investment career that can seriously impede investment returns. 

With that in mind, I’m going to highlight three of the most common mistakes investors make and what you can do to avoid repeating them.

High costs

As investors, there are only really two things we can control when it comes to the stock market. The price we pay to acquire assets and expenses. Deciding how much to pay for an asset can be a complicated process.

Making sure you are paying as little as possible for a stockbroker’s services, however, is relatively straightforward. Today, there’s a range of low-cost stockbrokers that offer dealing services for £15 or less, and most charge significantly less if you’re investing in funds.

Account administration fees have also dropped rapidly over the past few years. Today, you can open a trading account for as little as 0.25% per year, a significant drop on the 1% or more managers used to charge.

The impact the lower fees will have on your returns over time cannot be understated. According to my calculations, a saver with £1,000 in an investment account charging 1.5% a year in management fees, would see their money grow to be worth £1,553 over the space of a decade, assuming an annual return of 6%. If the same saver used a lower-cost account with a yearly charge of 0.25%, their money would grow to be worth £1,749, a difference of £196, or 11.2%. That’s why it pays to keep an eye on charges. 

Overtrading 

Another mistake that can substantially impact your returns over time is overtrading. The cost of jumping in and out of investments every couple of weeks or months might seem inconsequential at the time, but over the space of several years, these costs can add up. As well as increased commissions, you’ve also got to take into account costs, such as stamp duty, capital gains tax, and the fee you pay to market makers as part of the bid-offer spread. Jumping in and out of investments regularly also doesn’t give enough time to let the investment case play out.

Multiple studies have shown that investors are quite bad at timing the market, i.e. getting in at the bottom and out at the top. Therefore, in my opinion, it isn’t worth trying to time events. Instead, I believe buying and holding quality companies is better for your portfolio over the long term. It also reduces the risk that you’ll make a mistake.

A long-term view

The third most common mistake I think investors make is not taking a long enough view when planning their investments. It’s almost impossible to tell what the future holds for the stock market in the near term. But over the long run, and I’m talking about over the next 10 or 20 years, there’s a very high chance the market will be above the level it is at the moment. 

This is why it’s best to take a long-term view when picking stocks, and not guess what will happen in the short term. We don’t know what’s going to happen in the near term and, therefore, trying to guess could only lead to losses.

Rupert Hargreaves owns no share mentioned. The Motley Fool UK has no position in any of the shares mentioned. 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

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.
Investing Articles

Is 50 too old to start buying shares?

Christopher Ruane explains why 'better late than never' is key to his thinking about whether 50's too old to start…

Read more »

Two male friends are out in Tynemouth, North East UK. They are walking on a sidewalk and pushing their baby sons in strollers. They are wearing warm clothing.
Investing Articles

Here’s what £150 a month in a Junior ISA could be worth by 2045…

You might be surprised to learn by how large a Junior ISA portfolio could become inside 20 years from modest…

Read more »

Investing Articles

This red hot equity fund in my SIPP returned 12.6% in the first 2 months of 2026

This global equity fund is delivering huge returns for Edward Sheldon’s SIPP in 2026, despite all the risks and uncertainty…

Read more »

Friends at the bay near the village of Diabaig on the side of Loch Torridon in Wester Ross, Scotland. They are taking a break from their bike ride to relax and chat. They are laughing together.
Investing Articles

Want to retire richer? Here’s Warren Buffett’s golden rule to build wealth

If you want to build wealth for a richer retirement, then following Warren Buffett’s golden rule might be the best…

Read more »

Black woman using smartphone at home, watching stock charts.
Investing Articles

Get ready for stock market volatility…

As conflict in the Middle East makes share prices fluctuate, what strategies can investors use to try and find opportunities…

Read more »

British Isles on nautical map
Investing Articles

Why the FTSE 100 fell almost 5% this week

Declines in mining shares dragged the FTSE 100 down after a strong start to the year. Is the pullback an…

Read more »

Middle aged businesswoman using laptop while working from home
Investing Articles

How much do you need to invest in US stocks to earn a £2,000 monthly passive income?

Is it possible to target several thousand pounds of passive income each month by buying US growth stocks? Absolutely –…

Read more »

A mature woman help a senior woman out of a car as she takes her to the shops.
Investing Articles

How big does your ISA need to be to earn £1,000 a month in passive income?

Andrew Mackie explains how a long-term ISA strategy can help investors build a chunky £12,000 passive income in less than…

Read more »