Are you making these three devastating financial mistakes?

Making these critical mistakes could jeopardise your financial security.

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 makes mistakes. But when it comes to money, even simple mistakes can have a significant impact on your financial health.

With that in mind, here are three of the most common, devastating financial mistakes you can make… with some tips on how you can avoid making them ever again.

Lack of a budget

By far the most common money mistake is overspending. It might seem silly, but a simple budget can have a tremendous impact on your financial situation. Even if you only write down what’s coming in and what’s going out, it will help you get a grip on your finances, and limit overspending.

Budgeting is also imperative for saving for the future. A great way to make sure that you’re saving and not spending is to put a little money away every month before you start spending. Or, to put it another way, spend what’s left after saving. This will ensure money is always being set aside.

Credit card conundrum

Credit cards can be a useful product for managing your finances, if you’re able to pay off the balance every month. The average annual credit card interest rate is nearly 30%, which means even a small debt could spiral out of control quickly. The best way to stop this happening is to avoid credit cards altogether or, if you do use them, pay off the balance in full every month.

If you have any outstanding debt, it’s generally advisable to pay this off before you starting saving. It doesn’t make sense financially to be paying interest on debt if you can afford to pay it off.

Make your money work for you

Budget issues and debt are the most common financial mistakes, but a close third is poor returns.

A strict savings plan is all well and good, but if this money isn’t working for you, you could be missing out on a significant income stream. According to pensions provider Royal London, £100bn of cash is languishing in low-interest cash ISAs today, which shows just how much of a problem this issue is.

There are many different ways to get your money working harder, including investing. Investing might seem like a daunting prospect, but it really doesn’t require much extra effort on your part. Today, there are hundreds of different investment products on the market with the goal of streamlining the investment process, making it easier for novices to get into the market.

And the extra returns available more than make up for the limited amount of extra work required.

Indeed, according to my figures over the past decade, the FTSE 250 has produced an average annual return of around 8%. Over the same period, the average interest rate on offer from most cash savings accounts has been less than 1%. A small investment of £1,000, earning 8% a year, would grow to be worth £2,200 after a decade of growth. Meanwhile, the same starting investment making 1% per annum would grow to be worth just £1,100.

These figures clearly show that the best way to get your money working is to invest in the stock market.

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

Female student sitting at the steps and using laptop
Investing Articles

UK stocks: the contrarian choice for 2026

UK stocks aren’t the consensus choice for investors at the moment. But some smart money managers who are looking to…

Read more »

Investing Articles

Down 20% in 2025, shares in this under-the-radar UK defence tech firm could be set for a strong 2026

Cohort shares are down 20% this year, but NATO spending increases could offer UK investors a huge potential opportunity going…

Read more »

Young Caucasian woman with pink her studying from her laptop screen
Investing Articles

New to investing? Here’s Warren Buffett’s strategy for starting from scratch

Warren Buffett says he could find opportunities to earn a 50% annual return in the stock market if he was…

Read more »

Investing Articles

Can the sensational Barclays share price do it all over again in 2026?

Harvey Jones is blown away by what the Barclays share price has been doing lately. Now he looks at whether…

Read more »

Investing Articles

Prediction: in 2026 mega-cheap Diageo shares could turn £10,000 into…

Diageo shares have been burning wealth lately but Harvey Jones says long-suffering investors in the FTSE 100 stock may get…

Read more »

Investing Articles

This overlooked FTSE 100 share massively outperformed Tesla over 5 years!

Tesla has been a great long-term investment, but this lesser-known FTSE 100 company would have been an even better one.

Read more »

A pastel colored growing graph with rising rocket.
Investing Articles

I’m backing these 3 value stocks to the hilt – will they rocket in 2026?

Harvey Jones has bought these three FTSE 100 value stocks on three occasions lately, averaging down every time they fall.…

Read more »

Investing Articles

Can the barnstorming Tesco share price do it all over again in 2026?

Harvey Jones is blown away by just how well the Tesco share price has done lately, and asks whether the…

Read more »