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

Young Caucasian man making doubtful face at camera
Investing Articles

Time to start preparing for a stock market crash?

2025's been an uneven year on stock markets. This writer is not trying to time the next stock market crash…

Read more »

Santa Clara offices of NVIDIA
Investing Articles

Nvidia stock’s had a great 2025. Can it keep going?

Christopher Ruane sees an argument for Nvidia stock's positive momentum to continue -- and another for the share price to…

Read more »

Close-up of a woman holding modern polymer ten, twenty and fifty pound notes.
Investing Articles

£20,000 in savings? Here’s how someone could aim to turn that into a £10,958 annual second income!

Earning a second income doesn't necessarily mean doing more work. Christopher Ruane highlights one long-term approach based on owning dividend…

Read more »

Road 2025 to 2032 new year direction concept
Investing Articles

My favourite FTSE value stock falls another 6% on today’s results – should I buy more?

Harvey Jones highlights a FTSE 100 value stock that he used to consider boring, but has been surprisingly volatile lately.…

Read more »

UK supporters with flag
Investing Articles

See what £10,000 invested in the FTSE 100 at the start of 2025 is worth today…

Harvey Jones is thrilled by the stunning performance of the FTSE 100, but says he's having a lot more fun…

Read more »

Investing Articles

Prediction: here’s where the latest forecasts show the Vodafone share price going next

With the Vodafone turnaround strategy progressing, strong cash flow forecasts could be the key share price driver for the next…

Read more »

Front view of a young couple walking down terraced Street in Whitley Bay in the north-east of England they are heading into the town centre and deciding which shops to go to they are also holding hands and carrying bags over their shoulders.
Investing Articles

How much do you need in a SIPP or ISA to aim for a £2,500 monthly pension income?

Harvey Jones says many investors overlook the value of a SIPP in building a second income for later life, and…

Read more »

Friends at the bay near the village of Diabaig on the side of Loch Torridon in Wester Ross, Scotland. They are taking a break from their bike ride to relax and chat. They are laughing together.
Investing Articles

Can you turn your Stocks and Shares ISA into a lean, mean passive income machine?

Harvey Jones shows investors how they can use their Stocks and Shares ISA to generate high, rising and reliable dividends…

Read more »