Share your opinion and earn yourself a free Motley Fool premium report!

We are looking for Fools to join a 75 minute online independent market research forum on 15th / 16th December.

To find out more and express your interest please click here

Cash ISAs: millions of Britons could be making a huge financial mistake

The latest ISA statistics from HMRC show that Britons are pouring money into Cash ISAs. This is very worrying, says Edward Sheldon, CFA.

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.

HMRC has released Individual Savings Account (ISA) statistics for the 2018/19 financial year and, quite frankly, the figures are worrying.

While the statistics show that more people saved into an ISA last year, which is a good thing, they also showed that Britons piled a ton of money into Cash ISAs while neglecting Stocks and Shares ISAs. According to HMRC, the number of people using Cash ISAs rose by 1.4m, while the number of people subscribing to Stocks and Shares ISAs fell by 450,000.

In my view, this is alarming. Ultimately, millions of Britons could be making a huge financial mistake.

Cash ISAs could hurt your wealth

The reason I say this is that the interest rates on Cash ISAs right now are shockingly low. For example, a quick Google search tells me that the best Cash ISA rate (easy-access) is just 0.9%.

If you’re earning that kind of interest rate on your savings over the long run, you’re only going to go backward financially, when you consider the effects of inflation (rising prices of goods and services over time). Earn that kind of interest rate for a decade and you’ll find that when you come to spend your money, it buys you a lot less than it does today.

Of course, cash savings are useful when it comes to saving for short-term goals. They’re also important for emergency savings. However, in the long run, cash savings are ineffective when it comes to building wealth.

For a long-term saver, cash makes no sense,” says Holly Black, of research firm Morningstar.

Pick the right ISA

If your financial goals are more long term in nature, you’re much better off putting your money in a Stocks and Shares ISA or Lifetime ISA, in my view.

Both protect your wealth from the taxman, as the Cash ISA does, but with these two versions of the ISA, you can invest your money in a selection of wealth-building assets such as stocks, funds, exchange-traded funds (ETFs), and investment trusts.

For example, with a Stocks and Shares ISA, you can invest in a top fund such as Fundsmith Equity, which has turned £10k into £50k in less than a decade. Or you can invest in an investment trust like Scottish Mortgage, which is up more than 50% this year. Another option is to buy a low-cost ETF that tracks a major stock market index such as the FTSE 100 or the S&P 500.

Alternatively, if you fancy yourself as a stock-picker, you can put together a portfolio of stocks yourself. This strategy is slightly riskier than buying a fund or ETF but has the potential to deliver higher gains. For example, had you invested £2k in Boohoo shares five years ago, that money would now be worth over £20k.

These kinds of investments could help you build your wealth far more effectively than a Cash ISA.

Put £10,000 in a Cash ISA and earn 0.9% per year for a decade and your money will grow to £10,937. Put £10,000 in a Stocks & Shares ISA and earn 10% per year through the stock market, and your money will grow to £25,937. That’s a big difference.

If your goal is to grow your wealth, I’d pass on the Cash ISA and look at a Stocks and Shares ISA or Lifetime ISA instead.

Edward Sheldon owns shares in Boohoo and Scottish Mortgage Investment Trust and has a position in Fundsmith Equity. The Motley Fool UK has recommended boohoo group. 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

Light trails from traffic moving down The Mound in central Edinburgh, Scotland during December
Investing Articles

Start investing this month for £5 a day? Here’s how!

Is a fiver a day enough to start investing in the stock market? Yes it is -- and our writer…

Read more »

Young mixed-race couple sat on the beach looking out over the sea
Investing Articles

Investing in high-yield dividend stocks isn’t the only way to compound returns in an ISA or SIPP and build wealth

Generous payouts from dividend stocks can be appealing. But another strategy can offer higher returns over the long run, says…

Read more »

Middle-aged white man wearing glasses, staring into space over the top of his laptop in a coffee shop
Investing Articles

A rare buying opportunity for a defensive FTSE 100 company?

A FTSE 100 stock just fell 5% in a day without anything changing in the underlying business. Is this the…

Read more »

Two elderly people relaxing in the summer sunshine Box Hill near Dorking Surrey England
Investing Articles

Simplify your investing life with this one key tip from Warren Buffett

Making moves in the stock market can be complicated. But as Warren Buffett points out, if you don’t want it…

Read more »

Tesco employee helping female customer
Investing Articles

Is Tesco a second income gem after its 12.9% dividend boost?

As a shareholder, our writer was happy to see Tesco raise dividends -- again. Is it finally a serious contender…

Read more »

Rolls-Royce Hydrogen Test Rig at Loughborough University
Investing Articles

Has the Rolls-Royce share price gone too far?

Stephen Wright breaks out the valuation models to see whether the Rolls-Royce share price might still be a bargain, even…

Read more »

Tŵr Mawr lighthouse (meaning "great tower" in Welsh), on Ynys Llanddwyn on Anglesey, Wales, marks the western entrance to the Menai Strait.
Investing Articles

How much do you need to invest in a FTSE 100 ETF for £1,000 monthly passive income?

Andrew Mackie tested whether a FTSE 100 ETF portfolio could deliver £1,000 a month in passive income – the results…

Read more »

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

One of my top passive income stocks to consider for 2026 is…

This under-the-radar income stock has grown its dividend by over 370% in the last five years! And it might just…

Read more »