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.

Why you must avoid these 3 costly investment mistakes in 2019

Harvey Jones says you need to cut out the mistakes if you want to get richer in 2019.

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.

2018 has been a disappointing year for investors, with the FTSE 100 ending the year around 10% lower at 6,750.

We head into 2019 wondering whether President Donald Trump is making a terrible error by whipping up a US-China trade war, or if Federal Reserve chair Jerome Powell is making things worse by hiking interest rates four times in a year despite the global slowdown.

XXX

Anybody can make mistakes. You can’t influence Trump or Powell, but you can take a few steps to cut out your own errors, and avoid inflicting unnecessary damage on your portfolio. Here are three of the biggest to avoid the year ahead.

1. Panic selling

If you joined the rush to sell shares in the nightmare before Christmas, which saw the US S&P 500 suffer its worst week since 2011, you would be kicking yourself as US markets jumped 5% on Boxing Day, with the Dow posting its biggest ever single day gain. Imagine selling up and missing out on that.

Private investors have to resist the temptation to sell when share prices are falling, when everybody is panicking and analysts are predicting Armageddon. Instead, you should take advantage by buying shares at reduced prices. This is a message the Fool preaches time and again, but I make no apologies for that because it is a difficult thing to do in practice. It goes against most people’s herd instincts.

2019 is shaping up to be a volatile year but don’t panic as that means even more buying opportunities. Be warned, though, buying last year’s winners is another common error.

2. Timing the market

Finding the absolute perfect time to buy or sell a share is impossible. There are just too many variables, and nobody can do it with consistent success. The wisest investors, such as Warren Buffett, don’t even try.

You might think this is odd since I have just suggested you take advantage of share price dips to buy stock, but that is a different thing. That way you are buying something that has happened, not something you think is going to happen.

What you have to accept is that you will never buy at the absolute bottom or sell at the absolute top, and you will never get it just right even as you drive yourself mad trying.

3. Failing to have a plan

Investment opportunities present themselves all the time. For example, I believe the BP and Shell share price slump is handing us one now. You want to take advantage but you must also put any purchase in the context of your overall portfolio.

So if you already have a large chunk of your invested wealth in oil and energy stocks, you may not want to buy any more right now. Or maybe you already have hefty exposure to the FTSE 100 oil majors in various tracker or actively managed funds. Everything has to fit together.

Before buying any stock or fund, you need to know why you are investing, how long for, and your attitude to risk. Otherwise you are just making it all up as you go along. Don’t be in too much of a hurry.

harveyj has no position in any of the shares 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

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 »