Cash ISA versus the FTSE 100: Which should you choose?

Rupert Hargreaves explains why he thinks investing in the FTSE 100 (LON:INDEXFTSE: UKX) is always worth the risk.

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.

When it comes to saving for the future, tens of thousands of savers open a Cash ISA every year. While there’s nothing wrong with opening a Cash ISA, even the best interest rates available on the market today don’t compensate savers for the risks they are taking by leaving their money in cash.

The biggest risk savers face

The biggest risk cash savers face is inflation. Inflation can make cash savings, which many savers believe are risk-free, exceptionally risky. Every year, inflation chips away at your wealth. And if you are not earning a rate of interest that’s greater than the rate of inflation, then your money is actually losing value.

According to my research, the best Cash ISA interest rate available on the market today is around 1.5% for an easy access product, or 2.3% if you are willing to lock your money away for five years.

By comparison, the annual inflation rate for the UK during the first quarter of 2019 averaged 1.9%, which implies money in a flexible Cash ISA receiving an interest rate of 1.5% will lose 0.4% of its purchasing power this year.

In my opinion, inflation risk is the primary reason why the FTSE 100 is currently a better investment than Cash ISAs.

Inflation protection

With a dividend yield of 4.4% at the time of writing, the FTSE 100 more than compensates investors for the risk of inflation. On top of this, company earnings tend to increase with inflation over the long term as businesses increase their prices. This means the capital value of the FTSE 100 should increase with inflation over time as well.

So that’s inflation dealt with. But what about the risk volatility? While it’s true the FTSE 100 does go up and down on a day-to-day basis, over the long term, the index has only gone up.

Between 1999 and the end of 2018, the FTSE 100 produced a total return of 93.5%, which I think is an awe-inspiring return considering the fact that this two-decade time frame contains not one but two severe bear markets, the bursting of the dot.com bubble and the financial crisis.

The very fact that the FTSE 100 almost doubled investors money during this time frame, which was one of the most turbulent periods for financial markets for some time, stands testament to its ability to create wealth over the long term.

The bottom line

There’s nothing wrong with putting a portion of your savings in a Cash ISA but, as I’ve explained above, even though the tax advantages of this product are attractive, the current interest rates available don’t make up for the risk of inflation.

With that in mind, I think the FTSE 100 is a much better place to invest your money today. What’s more, owning a FTSE 100 tracker fund inside a Stocks and Shares ISA will achieve the same tax benefits and a much better return on your money over the long term.

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

This way, That way, The other way - pointing in different directions
Investing Articles

As the FTSE indexes sink, these unique dividend shares are making investors money

These two dividend shares are in positive territory for the month and outperforming the major FTSE indexes by a significant…

Read more »

Rolls-Royce's Pearl 10X engine series
Investing Articles

Down 15% in days, are Rolls-Royce shares suddenly a bargain again?

Rolls-Royce shares have been heading south over the past couple of weeks. This writer thinks that makes sense -- but…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

What would a 40-year-old need to put into an empty SIPP to target monthly passive income of £1,000?

From a standing start at 40, how might someone target a four-figure monthly income stream from their SIPP? Christopher Ruane…

Read more »

British flag, Big Ben, Houses of Parliament and British flag composition
Investing Articles

As the ISA deadline approaches, UK investors have the opportunity to buy cheap shares

In recent weeks, equity markets have fallen significantly due to the conflict in the Middle East. As a result, many…

Read more »

Array of piggy banks in saturated colours on high colour contrast background
Investing Articles

£5k left in a Stocks and Shares ISA? 2 top ETFs to consider buying in April

Ben McPoland highlights a pair of very different ETFs that he thinks could help generate long-term wealth inside an ISA…

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

Could a £20,000 ISA end up generating £20,000 of passive income each year?

Could a Stocks and Shares ISA ultimately cover its own cost each year with the passive income it produces? Christopher…

Read more »

A young black man makes the symbol of a peace sign with two fingers
Investing Articles

2 top stocks to consider buying after this week’s FTSE carnage

Investors looking for beaten-up stocks to buy for the long term have a lot of great options after the recent…

Read more »

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

A stock market crash could be a gift for long-term investors

A stock market crash could present some outstanding buying opportunities. But the key to taking advantage is knowing what to…

Read more »