We have some exciting news to share! The Motley Fool UK has now become The Twelfth Magpie -- an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. This site is our new home, and there will be extra tweaks made across the coming few days as we settle in. So if anything looks a little off, please bear with us!

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.

What I plan to do if the FTSE 100 plunges after Brexit

The FTSE 100 (INDEXFTSE: UKX) could plunge if the UK crashes out of the EU without a deal. Here’s how I plan to react if it does.

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.

Investing would be a lot easier if we could all predict the future. For example, if we knew how the UK will leave the EU at the end of March, it would be a lot easier to invest accordingly.

As it stands, we don’t know what will happen when Brexit becomes effective and whether or not we will leave the EU with a deal in place.

XXX

We also don’t know how the market will react. Some analysts have suggested the value of the pound will collapse if the UK crashes out of Europe with no deal. Other analysts have suggested the Bank of England will rush to raise interest rates to try and offset rising inflation, which will come as the result of higher tariffs on imported goods and services.

A sudden spike in interest rates could force many companies throughout the UK into liquidation as they struggle to meet rising interest costs. That’s not to mention any extra fees they might have to deal with as a result of increased delays and checks at UK borders.

A deal agreed? 

The worst forecasts suggest the UK economy will plunge into a recession, banks and businesses will collapse, unemployment will rise and stock markets will fall with a no deal Brexit. Those are the worst-case forecasts. On the other hand, some more bullish analysts and investors have speculated that the fallout from a no deal will be manageable.

Indeed, in recent weeks and months, there have been a number of agreements put in place between the UK and Europe that will ensure the continuity of vital services no matter what happens at the end of March.

So, if the UK crashes out of Europe with no deal, the worst forecasts suggest the economy will collapse, while the best suggest the fallout will be limited. But what if a deal is agreed at the last minute? How do we react then?

Impossible to tell 

The problem is, we don’t know what will happen between now and the end of March, so it’s impossible to plan. You could prepare for the worst, but what if the worst doesn’t happen? Or you could plan for the best case scenario, but what if a significant UK bank suddenly collapses at the beginning of April? If the unexpected does occur, it could upset your carefully planned post-Brexit investment strategy. 

With this being the case, I’m making absolutely no changes to my portfolio over the next six months. I have a large percentage of my portfolio invested in the FTSE 100 as I believe the UK’s leading blue-chip index will continue to generate returns for investors no matter what happens after March. 

As more than two-thirds of the index’s profits are generated outside the UK, the long term impact on the index from a no deal Brexit should be limited. In the short-term, it’s impossible to tell how the index will trade, and that’s why I’m planning to ignore it over the next six months. 

When the dust has settled, we should have more clarity on what the future holds for the UK’s relationship with the EU and the UK economy and only then can we make an informed decision on what investments to hold after Brexit.

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

Friends and sisters exploring the outdoors together in Cornwall. They are standing with their arms around each other at the coast.
Investing Articles

£503 buys 14 shares in this FTSE 250 stock that returned 23.9% annually for the last 15 years

This FTSE 250 stock has averaged a huge return for 15 years. At today's price, £503 buys 14 shares. But…

Read more »

Black woman using loudspeaker to be heard
Investing Articles

£1,000 buys 25 shares in this FTSE 100 stock that’s returned 29.2% annually for the last 10 years

This FTSE 100 mining stock has returned close to 30% a year for a decade. At 3,995p, £1,000 buys 25…

Read more »

Female student sitting at the steps and using laptop
Investing Articles

Down 47%, is this growth stock finally worth buying in May?

With a £288m order book and a hidden pipeline of defence and nuclear contracts, is this growth stock now too…

Read more »

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

2 REITs yielding 7%+ to consider for passive income in 2026

A REIT backed by the NHS and another backed by Tesco and Sainsbury's with both yielding 7%+. Here's why I'm…

Read more »

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

Just 97 shares of this UK dividend stock generate £238 in passive income

A 5.7% yield, £238 in passive income from just 97 shares, and one of the most divisive dividend stocks on…

Read more »

ISA coins
Investing Articles

£10,000 in an ISA generates a second income of…

The London Stock Exchange is home to some of the world's most generous dividends. But how big a second income…

Read more »

Shot of a senior man drinking coffee and looking thoughtfully out of a window
Investing Articles

Expert recommendations: 2 top income stocks yielding 7%+!

With yields of 7.2% and 7.8% respectively, these two income stocks are catching the eyes of institutional analysts. Should investors…

Read more »

Illustration of flames over a black background
Investing Articles

3 top income-focused stocks to buy in May 2026, according to experts

Looking for a stock to buy for income in May 2026? Experts have flagged these three UK dividend shares as…

Read more »