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.

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.

You’re reading a free article with opinions that may differ from The Twelfth Magpie’s Premium Investing Services. Become a member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn more, and get a free 'Best Buy Now' stock!.

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.

Should you buy Rolls Royce shares today?

Before you decide, please take a moment to review this report first. Despite ongoing uncertainties from US tariffs to global conflicts, Mark Rogers and his team believe many UK shares still trade at substantial discounts, offering savvy investors plenty of potential opportunities to learn about.

That’s why this could be an ideal time to secure this valuable research – Mark’s analysts have scoured the markets to reveal 5 of his favourite long-term ‘Buys’. Please, don’t make any big decisions before seeing 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

The Milky Way at night, over Porthgwarra beach in Cornwall
Investing Articles

Is the SpaceX IPO the best growth stock opportunity in a generation?

How about a mix of space exploration, satellite communications, and artificial intelligence? That's what SpaceX stock is all about.

Read more »

Red lorry on M1 motorway in motion near London
Investing Articles

No longer just a grocer: here’s how a shift in strategy could help Tesco shares hit new highs

Mark Hartley looks into the strategic data-driven transition that's helping Tesco become more than just a grocer, and could send…

Read more »

Middle-aged black male working at home desk
Investing Articles

British American Tobacco’s share price slumps 4%! How’s that happened?

British American Tobacco's share price has sunk today, making it the FTSE 100's worst performer. Is it time for dip…

Read more »

A hiker and their dog walking towards the mountain summit of High Spy from Maiden Moor at sunrise
Investing Articles

7.5% yields! Here are 2 very different dividend stocks to consider buying in June

Dividend stocks can be great investments, but they’re not all the same. Stephen Wright outlines two for passive income investors…

Read more »

Person holding magnifying glass over important document, reading the small print
Investing Articles

Takeover talk! But how much is a £10,000 investment in easyJet shares 5 years ago worth today?

How can UK stocks with high dividend yields help investors earn a meaningful second income from the price of a…

Read more »

Middle aged businesswoman using laptop while working from home
Investing Articles

Up 41% in 12 months are Barclays shares still worth buying?

Andrew Mackie explores Barclays shares and argues the market may still be valuing the bank using an outdated playbook, despite…

Read more »

Little girl helping her Grandad plant tomatoes in a greenhouse in his garden.
Investing Articles

Why are ITM Power shares 69% off?

ITM Power shares are among the hottest UK stocks of 2026. So how come the share price is still down…

Read more »

Close-up of British bank notes
Investing Articles

As British American Tobacco shares dip, is this a hot buying opportunity?

Are British American Tobacco shares on their way to completing another decade of dividend growth? Let's check out this latest…

Read more »