Here’s how I’d invest £20k in 2021 to make a million

I think the best way to invest £20k is across a range of diversified investments. That’s how I’d structure my portfolio on my quest to make a million.

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.

I think the best way to invest £20k is in the stock market, particularly if I hope to make a million. I like to follow in the footsteps of billionaire investor Warren Buffett. Both he and his friend and colleague, Charlie Munger, advocate a buy and hold approach to investing. This is a tried and tested method first made famous by value investor Benjamin Graham in his 1934 book, The Intelligent Investor.

Deciding where and how to invest £20k

£20k is a lot of money, so to put it to work I need to consider my options. I’d begin by deciding where to buy my stocks. I think a Stocks and Shares ISA or Self-invested Personal Pension (SIPP), through a reputable broker such as Hargreaves Lansdown or AJ Bell, is the best starting point.

There will be fees incurred on each transaction, but fees on funds are lower than on individual equities. I’d probably allocate £3,000 to five individual stocks and the remaining £5k I’d split into five funds. If I hope to make a million, these need to be held for a minimum of five years, preferably many more.

Make a million

If I could guarantee a 12% effective annual return on my investment, I could invest £20k, leave it for 35 years and I’d be a millionaire, with a total sum of £1,055,992 accumulated. However, 12% every year for 35 years is pretty difficult to achieve. Therefore, if I could afford to top up my initial £20k investment, with a regular monthly sum, then I could achieve the millionaire mark at a lower interest rate.

With a 9% effective annual rate, £230 a month deposit for 30 years, on top of my initial £20k investment, would result in a final sum of £1,032,282. Or, by upping the timeline and monthly amount to 43 years at £450 respectively, I’d bring the interest rate right down to a very achievable 5% and the final sum would be £1,008,775.

While time, patience, and cash are a given, this goes to show it’s possible for ordinary people to become ISA millionaires.

What stocks should I buy in 2021?

With the likelihood of a vaccine rollout and normality returning in 2021, there may be less volatility in the UK stock markets. However, I don’t think that will be the case until later in the year. I believe the best way to invest £20k is to diversify my portfolio with a mixture of sectors and possibly countries, which may mean choosing an emerging markets fund or solid US stock. But with Brexit out of the way, the UK government wants to focus its efforts on ensuring the UK remains a financial hub of excellence. For this it will encourage investment in technology and financial stocks.

Micro Focus is a tech company that helps companies upgrade and secure their systems. Security is a big issue as cyber attacks have massively increased during the pandemic and I think this will continue to be an area of growth next year. Augmentum Fintech is a venture capital company investing in fast growing fintech businesses. So, I might consider one of these.

It can be difficult to know the best UK shares to buy now on my quest to make a million. I’d probably choose to invest £20k across fintech, oil, pharmaceuticals and emerging markets to ensure diversified exposure to several areas of growth.

Kirsteen has no position in any of the shares mentioned. The Motley Fool UK has recommended Hargreaves Lansdown and Micro Focus. 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

Investing Articles

Down 35% in 2 months! Should I buy NIO stock at $5?

NIO stock has plunged in recent weeks, losing a third of its market value despite surging sales. Is this EV…

Read more »

Two employees sat at desk welcoming customer to a Tesla car showroom
Investing Articles

Could 2026 be the year when Tesla stock implodes?

Tesla's 2025 business performance has been uneven. But Tesla stock has performed well overall and more than doubled since April.…

Read more »

Portrait of elderly man wearing white denim shirt and glasses looking up with hand on chin. Thoughtful senior entrepreneur, studio shot against grey background.
Investing Articles

Could these FTSE 100 losers be among the best stocks to buy in 2026?

In the absence of any disasters, Paul Summers wonders if some of the worst-performing shares in FTSE 100 this year…

Read more »

Midnight is celebrated along the River Thames in London with a spectacular and colourful firework display.
Investing Articles

Up 184% this year, what might this FTSE 100 share do in 2026?

This FTSE 100 share has almost tripled in value since the start of the year. Our writer explains why --…

Read more »

Close-up as a woman counts out modern British banknotes.
Investing Articles

You can save £100 a month for 30 years to target a £2,000 a year second income, or…

It’s never too early – or too late – to start working on building a second income. But there’s a…

Read more »

Hydrogen testing at DLR Cologne
Investing Articles

Forget Rolls-Royce shares! 2 FTSE 100 stocks tipped to soar in 2026

Rolls-Royce's share price is expected to slow rapidly after 2025's stunning gains. Here are two top FTSE 100 shares now…

Read more »

Road 2025 to 2032 new year direction concept
Investing Articles

Brokers think this 83p FTSE 100 stock could soar 40% next year!

Mark Hartley takes a look at the factors driving high expectations for one major FTSE 100 retail stock – is…

Read more »

Investing Articles

I asked ChatGPT for the best FTSE 100 shares to consider for 2026, and it said…

Whatever an individual investor's favourite strategy, I reckon there's something for everyone among the shares in the FTSE 100.

Read more »