Why Brexit isn’t the biggest risk facing your portfolio

While Brexit could hurt share prices, a bigger risk may be just around the corner.

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.

With the EU referendum now less than a month away, the polls are telling us one thing: it’s likely to be a relatively close result. This means there’s a real chance that in just a handful of weeks’ time, the UK will be preparing to no longer be a member of the EU and will seek to go it alone for the first time in a generation.

While this may be a considerable risk to the UK economy and to the FTSE 100 in the short run, it’s not the only risk which the FTSE 100 faces. In fact, investors in the UK face a much bigger threat which has the potential to cause significant volatility and a period of depressed share prices.

Interest rates

That risk is US interest rate rises. The first rate rise occurred in December and since then the S&P 500 and FTSE 100 have been hugely volatile. Furthermore, in the weeks and months following the rate hike of 0.25%, share prices came under such severe pressure that the Federal Reserve decided to delay further rate rises until the market was in a more settled state. And with it apparently being so at the present time, there seems to be a good chance that the Federal Reserve will raise rates next month.

Although the impact of the next rate rise may not be as significant as the first, it’s still likely to change investors’ perceptions of the outlook for the US and global economy. While the US economy is continuing to post strong economic data on the whole, there’s a real risk that a tighter monetary policy will act as a brake on further progress. And even though the Federal Reserve is at pains to point out to investors that it’s not seeking to raise rates any faster than they need to, such rises still bring a huge amount of uncertainty to global stock markets.

A key reason for this is that it could be argued the bull run that has occurred since the credit crunch has largely been due to the availability of cheap money. In other words, the US economy hasn’t been forced to exist in more ‘normal’ economic times for a number of years, since an interest rate of near-zero encourages spending, borrowing and investing. However, all those things are set to gradually become less attractive and this should naturally cause at least a degree of pressure on the economic outlook.

Certainly, Brexit has the potential to hurt investor sentiment in the short run as it brings uncertainty. This doesn’t mean it’s necessarily a bad thing in the long run, but because it’s an unprecedented event it’s likely to make the investment world somewhat nervous. But the real danger to investors’ portfolios could turn out to be US monetary policy, even though Brexit, not a more hawkish Federal Reserve, seems to be dominating the financial news headlines.

More on Investing Articles

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

£20,000 invested in BP shares 1 year ago is now worth…

BP shares have rocketed in the past 12 months, yet analysts think the real growth story is only just beginning,…

Read more »

A pastel colored growing graph with rising rocket.
Investing Articles

A 6.8% forecast yield! 1 often-overlooked FTSE 100 income stock to buy today?

This income stock offers a high forecast yield and strengthening momentum, yet many investors overlook it — creating a rare…

Read more »

GSK scientist holding lab syringe
Investing Articles

GSK’s share price is under £22, but with a ‘fair value’ much higher, is it time for me to buy more right now? 

GSK’s share price rose over the last year, but a huge gap remains between its price and fair value —…

Read more »

Businessman hand stacking money coins with virtual percentage icons
Investing Articles

Here’s how investors can aim for £11,363 a year in passive income from £20,000 in this overlooked FTSE media gem

I think this media stock is commonly overlooked by investors looking for high passive income, but it shouldn’t be, given…

Read more »

Tesla car at super charger station
Investing Articles

Why is Tesla stock down 30% since late 2025?

Tesla stock has been a bit of a car crash in 2026. Edward Sheldon looks at what’s going on, and…

Read more »

UK supporters with flag
Investing Articles

Is Wise now the UK stock market’s top growth share?

Wise rose around 4% in the UK stock market yesterday, bringing its four-year gain to 135%. Why are investors warming…

Read more »

Warhammer World gathering
Investing Articles

£20,000 invested in this FTSE 100 stock 10 years ago is now worth this astonishing amount…

This FTSE 100 stock's delivered an amazing return over the past 10 years. James Beard considers whether it’s worth holding…

Read more »

DIVIDEND YIELD text written on a notebook with chart
Investing Articles

8.4%! Why do Legal & General shares always have such a high dividend yield?

Legal & General shares come with an 8.4% dividend yield. But this is essentially a risk premium for buying shares…

Read more »