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

Why I think a cash ISA could be your biggest retirement savings mistake

A cash ISA could lead to low returns and a loss of spending power, in my opinion.

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.

As ever, greater rewards from an investment are only possible when risks also rise. As such, many individuals may be dissuaded from buying a range of FTSE 100 and FTSE 250 shares as a result of the potential for the loss of capital.

In contrast, the risk of loss from a cash ISA appears to be zero – provided an individual’s investment doesn’t exceed the level of protection provided by the regulator. Therefore, a cash ISA may appear to be a worthwhile means of planning for retirement, since it offers a return of around 1.5% with limited risk.

Inflation

The problem, though, is that over the long run the returns on a cash ISA are likely to be beaten by inflation. This could mean that there’s a risk an individual’s spending power is eroded throughout their lifetime. This could leave them with insufficient capital from which to draw an income in older age, since £1 in 20 years will not be able to buy the same value of goods or services at it does today.

Therefore, with inflation currently above the best rates available on a cash ISA, there’s a risk investors will ultimately fail to achieve their goal of having a sizeable nest egg in place by retirement.

Monetary policy

Of course, interest rates are currently close to historic lows. Over the long run, it could be argued that these are likely to rise, and cash ISAs will gradually offer higher returns with limited risk.

However, the rate of inflation is likely to have a significant impact on the level of interest rates. In other words, significant increases in rates are unlikely to take place unless there’s evidence the economy is overheating. Therefore, inflation is likely to be continually one step ahead of the rates that are available on a cash ISA. This means that the real return of a cash ISA may continue to be negative, even if the UK’s monetary policy tightens over the long run.

Risk/reward

For individuals who are retired or close to retirement, lower-risk investments could prove to be a sound idea. However, for investors who have a long-term time period, buying riskier assets which offer higher potential returns could prove to be a good move. The FTSE 100 and FTSE 250 could experience major bear markets over the coming years. But over the long run, their track records show they’re likely to deliver a recovery. In fact, they’ve always recovered from bear markets, and have gone on to post higher highs.

Therefore, utilising a stocks and shares ISA for the bulk of a retirement portfolio could help to build a significant nest egg in older age. It could be used to generate a second income which is far higher than that of a cash ISA in real terms.

More on Investing Articles

Businessman hand flipping wooden block cube from 2024 to 2025 on coins
Investing Articles

After huge gains for S&P 500 tech stocks in 2025, here are 4 moves I’m making to protect my ISA and SIPP

Gains from S&P tech stocks have boosted Edward Sheldon’s retirement accounts this year. Here’s what he’s doing now to reduce…

Read more »

View of Lake District. English countryside with fields in the foreground and a lake and hills behind.
Investing Articles

With a 3.2% yield, has the FTSE 100 become a wasteland for passive income investors?

With dividend yields where they are at the moment, should passive income investors take a look at the bond market…

Read more »

Smart young brown businesswoman working from home on a laptop
Investing Articles

Should I add this dynamic FTSE 250 newcomer to my Stocks and Shares ISA?

At first sight, a UK bank that’s joining the FTSE 250 isn’t anything to get excited by. But beneath the…

Read more »

Investing Articles

£10,000 invested in BT shares 3 months ago is now worth

BT shares have been volatile lately and Harvey Jones is wondering whether now is a good time to buy the…

Read more »

Person holding magnifying glass over important document, reading the small print
Investing Articles

After a 66% fall, this under-the-radar growth stock looks like brilliant value to me

Undervalued growth stocks can be outstanding investments. And Stephen Wright thinks he has one in a company analysts seem to…

Read more »

Content white businesswoman being congratulated by colleagues at her retirement party
Investing Articles

Don’t ‘save’ for retirement! Invest in dirt cheap UK shares to aim for a better lifestyle

Investing in high-quality and undervalued UK shares could deliver far better results when building wealth for retirement. Here's how.

Read more »

Black woman using smartphone at home, watching stock charts.
Investing Articles

1 growth and 1 income stock to kickstart a passive income stream

Diversification is key to achieving sustainable passive income. Mark Hartley details two broadly different stocks for beginners.

Read more »

ISA coins
Investing Articles

How to aim for a £12k second income starting with a 20k ISA

With inflation and taxes on the rise, having a tax-free second income is now more important than ever. Zaven Boyrazian…

Read more »