2 investing mistakes that could be sabotaging your Stocks and Shares ISA

Don’t let your hard-earned savings go to waste!

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.

Everyone knows that money correctly invested in the stock market will, over time, compound very nicely. However, it’s also true that not everyone makes money in the stock market. If it were easy, everyone would do it. The good news is that most investors lose money because of easily avoidable mental errors.

Here are two mistakes that I think could be holding your retirement plan back.

Not being diversified enough

Investing is a tricky thing. On the one hand, you need to have enough confidence to decide that a stock is worth buying – while other people in the market are selling it; but on the other hand, you need to have a large dose of humility and accept the fact that you will sometimes be wrong. Good investing is being wrong less than 50% of the time. In other words, you can’t always be right, but you should aim to make the odds work in your favour. 

Diversification is a central concept to investing because it minimises the extent to which any one stock can affect your portfolio. True, this means that you will sometimes have to limit your exposure to a given company, which can be difficult if you really believe in it. But I would much rather have a slightly lower rate of return and insulate myself from a freak wipeout, than tack on a few extra percentage points by concentrating my portfolio in one area and risk losing it all in a day.

Excessive activity

Overtrading has historically accounted for some of the biggest losses suffered by ordinary investors. While you may think that being proactive in the management of your portfolio is the right thing to do, sometimes inaction is the best form of action. In the past, when trading commissions were much higher, retail investors would sacrifice whole percentage points of return due to brokerage fees.

To put this into perspective, the difference between £10,000 invested for 40 years at 5% (compounds to £70,400) and 7% (compounds to £149,744) is £79,344. Losing 2 points of annual return more than halved the compounded amount!

Nowadays, brokerages do not charge anywhere near as high fees as they used to. However, you may still incur taxes on share dealing that could eat into your returns in a similar fashion. Moreover, by constantly trading in and out of stocks, you run the risk of missing out share price appreciation. Studies have consistently shown that investors, both amateur and professional, are not good at timing the market or identifying tops and bottoms in stock prices. It appears that doing so is almost impossible.

What is possible, however, is identifying stocks that are priced cheaply relative to intrinsic value. If you can do that, and hold onto your portfolio for a long time with minimal churn, you will be well on your way to building that retirement pot.

Neither Stepan nor The Motley Fool UK have a 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

Happy woman commuting on a train and checking her mobile phone while using headphones
Investing Articles

Barclays shares surge: stick or twist?

Barclays shares surged on Wednesday after the US and Iran announced a ceasefire agreement for two weeks. But there's more…

Read more »

A pastel colored growing graph with rising rocket.
Investing Articles

What would £10,000 invested in Aviva shares 5 years ago be worth today?

Aviva shares have outperformed the FTSE 100 over the past five years. And the dividends have been impressive too. But…

Read more »

Senior couple crossing the road on a city street. They are walking with shopping bags while Christmas shopping.
Investing Articles

Could these 8 FTSE 250 shares turn £20,000 into £297,276 within 25 years?

James Beard reckons it’s possible to use dividend shares to create long-term wealth. But could his strategy work with these…

Read more »

British pound data
Investing Articles

Could AI bring on the mother of all stock market crashes?

Some are predicting AI will lead to a stock market crash like we’ve never seen before. James Beard considers how…

Read more »

Couple working from home while daughter watches video on smartphone with headphones on
Investing Articles

How did Rolls-Royce shares add £5bn in market cap in one day?

Rolls-Royce shares have just had a brilliant day. Is this a sign the share price is about to go on…

Read more »

Thoughtful man using his phone while riding on a train and looking through the window
Investing Articles

How much would someone need in an ISA to target a £1,000 monthly passive income?

Dr James Fox explains how a novice investor could leverage an empty ISA to target a passive income in excess…

Read more »

Thoughtful man using his phone while riding on a train and looking through the window
US Stock

Down 10% this year, this S&P 500 banking giant looks super-cheap

Jon Smith flags a S&P 500 stock that’s had a rough few months but could start to rally if his…

Read more »

Two business people sitting at cafe working on new project using laptop. Young businesswoman taking notes and businessman working on laptop computer.
Dividend Shares

4 FTSE 250 shares that could generate a 4-figure monthly second income

Jon Smith points out income shares with yields in excess of 7% that he believes could slot in well to…

Read more »