Why Warren Buffett Wouldn’t Choose A Cash ISA

Investments in stocks like a FTSE 100 (INDEXFTSE:UKX) tracker are safer than cash in the long run.

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.

Warren Buffett’s fans aren’t big risk takers; they’re ordinary investors who have seen their savings steadily grow under his conservative management. Over the past 50 years that he has been running Berkshire Hathaway, shareholders have seen the book value per share rise from $19 to over $146,000, a compound annual growth rate of 19.4%.

Homespun wisdom

Each year he writes to shareholders, imparting the kind of homespun wisdom that has given him the moniker The Sage of Omaha.

What is sound advice for the moms and pops of Oklahoma is worth listening to in the hard-pressed households of middle England. And Mr Buffett’s most recent letter has some specific advice that might come as a surprise to many who put savings into cash ISAs in the belief that it’s a safe way to invest for the future. In this year’s 50th anniversary letter he says:

“The unconventional, but inescapable, conclusion to be drawn from the past fifty years is that it has been far safer to invest in a diversified collection of American businesses than to invest in securities…. Stock prices will always be far more volatile than cash-equivalent holdings. Over the long term, however, currency-denominated instruments are riskier investments – far riskier investments – than widely-diversified stock portfolios that are bought over time and that are owned in a manner invoking only token fees and commissions.”

(The italics are Mr Buffett’s, not mine).

The UK equivalent of “securities”, “cash-equivalent holdings” and “currency-denominated instruments” are gilts, bonds, bank deposits and the like. Mr Buffett’s argument is that, over time, these kinds on savings are riskier than stocks. That’s because stocks grow in value, on average, whilst inflation makes the value of money shrink. He cites how, with reinvested dividends, the S&P 500 generated a return of 11,196% over the past 50 years, compared to an 87% decline in the purchasing power of the dollar.

Volatility isn’t the same as risk

Of course, stocks are more volatile, so owning stocks for just a day or week or year is riskier. Money that investors might need in this timescale should be stored in cash-like investments. Many financial advisors recommend keeping 6-months’ worth of earnings as cash. But if you have money to tuck away for several years, then stocks aren’t just likely to grow more, according to Mr Buffett they are less risky than cash. And if you can put that money in a stocks and shares ISA, you protect those big long-term gains from tax.

A low cost FTSE 100 tracker is one easy way for inexperienced investors to get started. The index has returned 9.6% p.a. over last three years and 9.1% p.a. over the last five.

Tony Reading has no position in any shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Arrow symbol glowing amid black arrow symbols on black background.
Investing Articles

Up 6%, can this ‘gritty’ stock continue outperforming the rest of the FTSE 250?

ITV's share price is soaring as investors react to a resilient performance in 2025. The question is, can the FTSE…

Read more »

Investing Articles

How much income could £20k in a Stocks and Shares ISA give you today?

As the clock ticks on this year's Stocks and Shares ISA allowance, Harvey Jones looks at how investors could use…

Read more »

Investing Articles

What next for the Endeavour Mining share price after a record-breaking set of results?

Since March 2025, Endeavour Mining’s share price has risen 175%. Do the gold miner’s latest results provide any clues as…

Read more »

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

How are Rolls-Royce shares looking in March 2026?

March promises to be an interesting time for Rolls-Royce shares, but should investors be worried or calm about developments?

Read more »

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

3 these stocks are smashing BAE Systems shares – are they worth considering today? 

Harvey Jones looks at the impact of current events on BAE Systems shares this week, and highlights some FTSE 100…

Read more »

Santa Clara offices of NVIDIA
Investing Articles

At a forward P/E of 17, is Nvidia stock now a screaming buy?

Stephen Wright outlines why Nvidia stock could be better value now than it has been in a long time, despite…

Read more »

Hand of person putting wood cube block with word VALUE on wooden table
Investing Articles

I asked ChatGPT to name the most undervalued share on the UK stock market. Here’s what it said…

Always on the lookout for value shares to add to his portfolio, James Beard turned to a well-known artificial intelligence…

Read more »

High flying easyJet women bring daughters to work to inspire next generation of women in STEM
Investing Articles

Are easyJet shares easy money at 425p?

While other airline stocks have soared since the pandemic, easyJet shares have remained grounded. Is the share price set for…

Read more »