Warning! Cash ISAs can destroy your wealth: here’s what I’d buy instead

Cash ISAs could give investors a negative return over the long run. Stocks, on the other hand, could provide a much higher positive gain.

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.

Following this year’s stock market crash, it’s easy to see why investors have rushed to open Cash ISAs.

However, while these products might look as if they can provide protection in uncertain times, over the long term, they could destroy your wealth.

Today I’m going to explain why, and what investors can do to stop this from happening.

Cash ISA drawbacks

Interest rates available on Cash ISA products have plunged this year.

At the beginning of the year, investors could have achieved an interest rate of 1.5% per annum on their money. Today, they would be lucky to get more than 0.9%.

This is the biggest drawback of these products. Over the past 10 years, the rate of inflation has averaged 2% per annum. This suggests that an interest rate of 0.9% means investors are receiving a real interest rate (after inflation) of -1.1%.

To put it another way, opening a Cash ISA today may erode your wealth over the long run.

That being said, every investor should have some of their money invested in cash in case of emergencies. So these products play may still have a valuable role to play in some investors’ portfolio.

Nevertheless, if you are serious about growing your wealth, there’s a much better alternative to the Cash ISA out there.

A perfect alternative

The best alternative to opening a Cash ISA could be to open a Stocks and Shares ISA.

Stocks and Shares ISAs allow investors to hold cash and stocks and shares. Many companies support dividend yields significantly above the best Cash ISA interest rates on the market at the moment.

For example, the average dividend yield of the FTSE 100 is around 3.6%. That is three times higher than the best Cash ISA interest rate.

Stocks and Shares also offer the potential for capital gains. Over the past three-and-a-half decades, the FTSE 100 has produced an average annual return for investors of around 8%. This has come through a combination of income and capital gains. It is impossible to achieve capital growth with a Cash ISA.

Building a portfolio

The best way to capitalise on the wealth-creating power of the stock market is to build a diversified stocks and shares portfolio.

Investors can do this with a basket high-quality blue-chip stocks, investment funds, tracker funds or investment trusts. All of these instruments provide different ways to gain exposure to the market.

I would use a combination of all four. This would allow me to build a well-diversified portfolio of stocks and shares across different markets and sectors.

The diversification would help capitalise on the long-term market performance while minimising losses if something went wrong.

While investing in the stock market is always going to have a bit more risk than owning cash, diversification, and the potential for higher returns should more than make up for this risk over the long run.

Rupert Hargreaves 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

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.
Investing Articles

ISA or SIPP? Here’s 1 advantage and 1 disadvantage of both

SIPPs and Stocks and Shares ISAs both have potentially attractive features, as well as downsides. Christopher Ruane looks at some…

Read more »

Portrait of pensive bearded senior looking on screen of laptop sitting at table with coffee cup.
Investing Articles

£1,000 invested in Lloyds shares 6 weeks ago is now worth…

Lloyds shares have been on a huge run in the last couple of years. But is a 15% pullback in…

Read more »

Man smiling and working on laptop
Investing Articles

After the FTSE 100’s slump, these bargain shares are calling!

Are you on the lookout for top cheap stocks to buy? Royston Wild reveals three FTSE 100 value shares he's…

Read more »

Man hanging in the balance over a log at seaside in Scotland
Investing Articles

Worried about a stock market crash? Here are 2 things you should know

A stock market crash may look plausible, but it’s far from a done deal. Still, if markets do wobble, I…

Read more »

piggy bank, searching with binoculars
Investing Articles

This FTSE 100 stock soared 900% — but after a 25% crash, is the rally over?

After blowing away the FTSE 100 in 2025, this miner has hit turbulence in 2026 — Andrew Mackie investigates what’s…

Read more »

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.
Investing Articles

How much do I need in an ISA for a £700 second income?

Investing in dividend shares can be a great way to target a second income from a Stocks and Shares ISA.…

Read more »

Businessman with tablet, waiting at the train station platform
Investing Articles

If there’s a stock market crash this week, will you be ready?

Christopher Ruane explains why he's not phased by the inevitability of a stock market crash -- but is actively preparing…

Read more »

Mindful young woman breathing out with closed eyes, calming down in stressful situation, working on computer in modern kitchen.
Investing Articles

£15,000 invested in Diageo shares 3 weeks ago is now worth…

Bad times for Diageo shares! The last three weeks have seen yet another drop, but is this a time to…

Read more »