Forget a Cash ISA: I say a stock market crash is a FTSE 100 buying opportunity

Are you thinking of a Cash ISA to protect against a stock market crash? Please read this before you do anything so drastic.

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.

I’ve only just explained why I don’t think there’s going to be a FTSE 100 crash any time soon, but part of me is hoping I’ll be proven wrong and that we really are in for one. Why?

Well, I’ve seen a few stock market slumps in my time, and there are two things that have been unarguably true about every single one of them – every one recovered, and every one provided great buying opportunities while it lasted.

So if you’re still in a net buying stage of your investing life, you should welcome stock market crashes as they come along and use them to snap up new shares for less money than you’d otherwise have to pay, shouldn’t you?

Income unaffected

But what if you’re not in a net withdrawal stage, and instead of buying more shares you’re relying on the income from your investments. When I reach my withdrawal stage, I intend to be fully invested in reliable dividend stocks. And you know what a stock market crash does to dividends? Nothing at all. At least, it shouldn’t affect the ability of healthy companies with good dividend cover to keep handing over your regular cash.

And if you haven’t reached your net withdrawal years yet and are still lining up the dividend stocks that will help secure a wealthier and happier retirement, getting the best long-term yields can make a big difference.

FTSE 100 opportunities

Let’s look at a FTSE 100 dividend stock that my colleague Rupert Hargreaves rates as one to keep for life, AstraZeneca. The pharmaceuticals giant has rebuilt its drugs pipeline after losing some key patent protections a few years ago, and Rupert thinks it’s set up nicely now to provide a return to progressive annual dividends.

I agree, and the current forecast 3.3% yield looks like an attractive entry point. But if, say, AstraZeneca shares fell by 10% in a stock market crash, the dividend yield would rise to 3.6%, and the same boost would apply to all future dividends, year after year.

But you know what I think a lot of investors will do when they fear we’re heading for a stock market crash and they want to take defensive action? I reckon they’ll divert their investment cash away from shares and into their Cash ISAs, though I think that’s the exact opposite of a good strategy.

Terrible returns

The best easy access Cash ISA interest rates I can find today reach a measly 1.45%. While that might look better than an actual cash loss should you buy shares that fall in price, it doesn’t even match inflation even, though it dropped as low as 1.7% in August. If you find financial comfort in a guaranteed loss in real terms, well, let’s just say I don’t share your outlook.

Some will seek higher Cash ISA rates through fixed-term offerings, but even then the best I see are paying around 2.3% per year over five years. That’s a little ahead of inflation, but it means locking your cash up for five whole years and not being able to buy cheap shares.

The FTSE 100 is offering an overall dividend yield of 4.5% for 2019, and any market decline could see that boosted nicely. A crash could see us heading for the best time to buy shares in years.

Alan Oscroft has no position in any of the shares mentioned. The Motley Fool UK has recommended AstraZeneca. 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

Sunrise over Earth
Investing Articles

Meet the ex-penny share up 109% that has topped Rolls-Royce and Nvidia in 2025

The share price of this investment trust has gone from pennies to above £1 over the past couple of years.…

Read more »

House models and one with REIT - standing for real estate investment trust - written on it.
Investing Articles

1 of the FTSE 100’s most reliable dividend stocks for me to buy now?

With most dividend stocks with 6.5% yields, there's a problem with the underlying business. But LondonMetric Property is a rare…

Read more »

Investing Articles

Is 2026 the year to consider buying oil stocks?

The time to buy cyclical stocks is when they're out of fashion with investors. And that looks to be the…

Read more »

ISA coins
Investing Articles

3 reasons I’m skipping a Cash ISA in 2026

Putting money into a Cash ISA can feel safe. But in 2026 and beyond, that comfort could come at a…

Read more »

US Stock

I asked ChatGPT if the Tesla share price could outperform Nvidia in 2026, with this result!

Jon Smith considers the performance of the Tesla share price against Nvidia stock and compares his view for next year…

Read more »

Investing Articles

Greggs: is this FTSE 250 stock about to crash again in 2026?

After this FTSE 250 stock crashed in 2025, our writer wonders if it will do the same in 2026. Or…

Read more »

Investing Articles

7%+ yields! Here are 3 major UK dividend share forecasts for 2026 and beyond

Mark Hartley checks forecasts and considers the long-term passive income potential of three of the UK's most popular dividend shares.

Read more »

Hand is turning a dice and changes the direction of an arrow symbolizing that the value of an ETF (Exchange Traded Fund) is going up (or vice versa)
Investing Articles

2 top ETFs to consider for an ISA in 2026

Here are two very different ETFs -- one set to ride the global robotics boom, the other offering a juicy…

Read more »