Here’s how I’d invest £20k in UK shares today to double my money

I think investing £20k in UK shares could produce 100% returns over the long run. Here’s how I’d achieve that goal in today’s stock market.

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.

Investing £20k in UK shares today could realistically produce a portfolio valued at £40k within nine years. After all, the FTSE 100 and FTSE 250 have delivered annual total returns of around 8% in the past 20 years. Assuming the same rate of return in future would mean 100% returns are achieved within nine years.

However, it may be possible to beat the stock market’s returns. Many shares are trading at cheap prices that seem to undervalue their long-term growth prospects. Through buying a diverse range of them, an investor could reduce the amount of time it takes to double their money on the stock market.

Investing £20k in UK shares trading at cheap prices

Despite the recent stock market rally, it’s possible to invest £20k in UK shares that trade at cheap prices. Investor sentiment towards a wide range of sectors remains downbeat, with their challenging near-term prospects weighing on valuations.

For example, financial services companies including Aviva and HSBC trade significantly lower than they did at the start of the year. Yet, they have revised strategies that could lead to improving profitability over the long run.

Buying cheap shares has historically been a sound means of generating market-beating returns. For example, investors who purchased FTSE 100 and FTSE 250 shares after the global financial crisis are likely to have benefitted from the stock market’s subsequent recovery.

Similarly, the same approach is likely to have been successful after other notable bear markets, such as the 1987 crash and dot com bubble.

Buying high-quality businesses from across the FTSE 100 and FTSE 250

Clearly, investing £20k in UK shares comes with risks. The economic outlook is uncertain, and could even get worse before it improves. As such, buying a diverse range of companies is perhaps more important than ever.

A broad range of shares in a portfolio means less reliance on a small number of sectors for returns. Over time, this can have a positive impact on an investor’s chances of doubling their money.

Meanwhile, buying high-quality companies could be an important means of outperforming the stock market. Clearly, what makes a business ‘high quality’ is subjective. However, traits such as a solid balance sheet, a wide economic moat and a strategy that provides flexibility in an uncertain economic period are likely to be key ingredients.

Such companies may outperform the stock market – especially when they trade at cheap prices today following the recent stock market crash.

Making 100% over and over again

Of course, investing £20k in UK shares to make a 100% return can lead to a surprisingly large portfolio in the long run. Compounding makes each subsequent 100% return even more valuable in monetary terms.

Even assuming an 8% annual return would mean an investor with a 36-year timeframe has sufficient time for their initial investment to double four times. In doing so, a £20k investment could ultimately be worth £320k.

As such, taking a long-term view and buying high-quality companies at cheap prices could be a sound move.

Peter Stephens owns shares of Aviva and HSBC Holdings. The Motley Fool UK has recommended HSBC Holdings. 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 »