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

Roland Head explains how he’d follow Warren Buffett’s advice to make a million using a simple and cheap strategy, boosted with growth stocks.

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.

What’s the best way to make a million in the stock market? Ask 100 people and you’ll likely get 100 different answers. But the method I’d use is one that US investing legend Warren Buffett has often mentioned. It’s also simple and cheap.

Getting started: £20k

My plans are based on the goal goal of hitting £1m at age 60. In my view, a £20k lump sum could be enough to make that happen.

Warren Buffett has often commented that for most investors, he thinks an index tracker fund is the best way to invest. He’s at pains to point out that very few investors consistently beat the market, even professionals.

Over the last century or so, the long-term average return from the UK stock market has been about 8% per year, including dividends. Past performance isn’t a reliable guide to the future. But I estimate that if average returns remain the same in the future, it would take 50 years for my £20k investment to hit £1m.

If I’d started my index tracker investment at age 20, I’d just make it to £1m by the age of 70.

This is a great example of why it makes sense to start a Stocks and Shares ISA for children when they’re as young as possible. But it’s not much good to me now. My 20s are a distant memory.

Juice things up

While I’m still working, I aim to make regular monthly payments into my ISA. Adding these to my initial £20k should improve my returns significantly.

For example, my sums indicate that investing an extra £250 per month in a FTSE 100 tracker fund could see me make a million after 37 years. Similarly, increasing my monthly payment to £400 could see me hit £1m after just 33 years.

By combining regular monthly payments and an initial lump sum, I should be able to speed up my progress. But 33 years is still a long time. Is there anything else I could do to improve my returns?

Could I make a million with growth stocks?

Investing in small, speculative growth stocks can deliver much bigger profits. But it’s a specialist area with a lot of potential risk. It’s easy to lose a lot of money, as many growth companies don’t succeed.

After all, the UK stock market has 1,117 companies valued at under £500m, but only 174 companies valued at over £2bn. Most small companies stay small.

When I’m looking for growth, I prefer to focus on the FTSE 250. These mid-sized companies are generally already profitable and successful. They’re big enough to survive when times are tough, but still small enough to deliver strong growth.

The FTSE 250 has risen by 76% over the last 10 years, compared to just 13% for the FTSE 100. I can’t be sure this outperformance will continue. But to improve my chances of benefiting from the success of smaller growth stocks, I’d put half my cash into a FTSE 250 tracker and half into the FTSE 100.

To increase my exposure to proven winners, I might also use some of my funds to build a portfolio of hand-picked quality stocks. I’d look for companies with above-average profit margins and a track record of beating the market.

I’d hope that taking this approach might provide the boost I’ll need to reach my £1m goal by the time I’m 60.

Roland Head has no position in any of the shares 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

Ice cube tray filled with ice cubes and three loose ice cubes against dark wood.
Investing Articles

Recently released: December’s lower-risk, higher-yield Share Advisor recommendation [PREMIUM PICKS]

Ice ideas will usually offer a steadier flow of income and is likely to be a slower-moving but more stable…

Read more »

Sunrise over Earth
Investing Articles

Meet the ex-penny share up 109% that has topped Rolls-Royce and Nvidia in 2025

The share price of this investment trust has gone from pennies to above £1 over the past couple of years.…

Read more »

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

1 of the FTSE 100’s most reliable dividend stocks for me to buy now?

With most dividend stocks with 6.5% yields, there's a problem with the underlying business. But LondonMetric Property is a rare…

Read more »

Investing Articles

Is 2026 the year to consider buying oil stocks?

The time to buy cyclical stocks is when they're out of fashion with investors. And that looks to be the…

Read more »

ISA coins
Investing Articles

3 reasons I’m skipping a Cash ISA in 2026

Putting money into a Cash ISA can feel safe. But in 2026 and beyond, that comfort could come at a…

Read more »

US Stock

I asked ChatGPT if the Tesla share price could outperform Nvidia in 2026, with this result!

Jon Smith considers the performance of the Tesla share price against Nvidia stock and compares his view for next year…

Read more »

Investing Articles

Greggs: is this FTSE 250 stock about to crash again in 2026?

After this FTSE 250 stock crashed in 2025, our writer wonders if it will do the same in 2026. Or…

Read more »

Investing Articles

7%+ yields! Here are 3 major UK dividend share forecasts for 2026 and beyond

Mark Hartley checks forecasts and considers the long-term passive income potential of three of the UK's most popular dividend shares.

Read more »