Could I use a stock market crash to turn £20k into half a mil in just over a decade?

A stock market crash might sound terrifying to some but it can also present a once-in-a-lifetime opportunity to accumulate generational wealth.

| More on:

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.

Two business people sitting at cafe working on new project using laptop. Young businesswoman taking notes and businessman working on laptop computer.

Image source: Getty Images

While I wouldn’t wish a stock market crash on anyone, savvy investors know a good opportunity when they see one. The trick to making the most of such an opportunity is being prepared.

As the saying goes: failing to prepare is preparing to fail. 

Nobody knows for sure when the next crash will come so it’s critical to keep some savings aside. With enough cash on hand, a cunning investor can grab the right stocks at the right time!

However, it’s important to understand the psychology of market downturns and have a strategy for taking advantage of lower prices. Turning £20k into half a million pounds is no easy feat – and involves some risk!

Here’s a breakdown of how I’d try to do it.

Maximise my ISA potential

Twenty grand is a fair bit of money so I’d need to spend some time saving to start with. It’s also the ideal amount to fill a Stocks and Shares ISA with the full yearly allowance. Using an ISA would help reduce any capital gains tax I pay on my returns.

Please note that tax treatment depends on the individual circumstances of each client and may be subject to change in future. The content in this article is provided for information purposes only. It is not intended to be, neither does it constitute, any form of tax advice. Readers are responsible for carrying out their own due diligence and for obtaining professional advice before making any investment decisions.

Smart investors know that a market crash isn’t a reflection of individual companies’ long-term value. Many solid businesses experience temporary price drops simply because of market-wide panic. During a crash, well-established and financially sound companies often become available at a discount. 

So it’s important to identify which stocks have high intrinsic value but have been pulled down by the broader market.

Identifying quality stocks

Consider a stock like British American Tobacco. It’s provided annualised returns of 6% over the past 30 years. Certainly, there’s been some ups and downs in that time but overall, it’s proven a steady gainer. 

Currently, the dividend yield‘s over 8% but on average it’s stood around 5% for the past few decades.

Assuming those averages held, £20k invested would grow to almost £470,000 in 30 years, with dividends reinvested. Buying at the bottom of a crash would likely deliver even greater returns.

Don’t like tobacco? Let’s consider Legal & General (LSE: LGEN), the well-established £13bn UK insurance provider. Its annual dividend has increased at a rate of 13.3% a year since 2008, rising from 4p per share to 20p. 

However, it holds substantial liabilities tied to long-term policies, making it vulnerable to adverse market conditions that can affect its ability to generate returns on reserves.

That may be one reason the price is down 11% this year.

Looking long-term however, its 30-year annualised returns are also around 6%. The yield’s currently at 9.3% but on average it’s been around 6.5% since 2014. With those averages, £20k could grow to half a million in just 27 years.

Looking back to the 2008 financial crisis, the stock fell 75% that year. That would be like today’s 220p price falling to 55p. But in the 10 years following the crash, the price recovered at an annualised rate of almost 22% a year. 

If that happened again, a £20k investment could balloon to over £500,000 in less than 13 years! 

I wouldn’t put everything in one stock though. Rather, I’d aim for similar average returns by diversifying my investment across a portfolio of stocks. This helps to reduce exposure to industry- or company-specific risks.

Mark Hartley has positions in British American Tobacco P.l.c. and Legal & General Group Plc. The Motley Fool UK has recommended British American Tobacco P.l.c. 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

Front view of aircraft in flight.
Investing Articles

Is it game over for the BP share price rally?

The BP share price has looked like a one-way bet in recent weeks as oil and gas prices soar but…

Read more »

Man hanging in the balance over a log at seaside in Scotland
Investing Articles

Amid geopolitical and AI risks, here’s how I’m positioning my ISA and SIPP in 2026

Edward Sheldon explains how he's allocating capital within his investment accounts and SIPP amid the various risks to the market.

Read more »

Young mixed-race woman looking out of the window with a look of consternation on her face
Investing Articles

My game plan for the next stock market crash

Markets have been surprisingly resilient during the recent Middle East conflict but we still cannot rule out a stock market…

Read more »

Concept of two young professional men looking at a screen in a technological data centre
Investing Articles

1 top growth stock to consider buying after it crashed 59%

This S&P 500 growth stock has fallen off a cliff lately due to AI software fears. Our writer thinks this…

Read more »

A mature woman help a senior woman out of a car as she takes her to the shops.
Investing Articles

Here’s how a 35-year-old putting £15 a day into an ISA could end up earning £18k+ of passive income annually!

A 35-year-old with no ISA but a willingness to invest relatively small sums could one day be earning many thousands…

Read more »

Young black colleagues high-fiving each other at work
Investing Articles

With the potential to double in 10 years, this could be a dividend stock to consider buying

With a yield of 7.2%, income investors might consider buying this stock. But reinvesting the dividends could deliver even more…

Read more »

Happy couple showing relief at news
Investing Articles

How much would someone need to invest in the stock market to target a £1,250 monthly second income?

Investing in the stock market can help deliver long-term wealth. But James Beard says it can also be a way…

Read more »

happy senior couple using a laptop in their living room to look at their financial budgets
Investing Articles

How much would someone need in an ISA to aim to treble the current State Pension?

Experts say the State Pension isn’t generous enough to provide a comfortable retirement. James Beard says the stock market could…

Read more »