Here’s how I’d invest £20,000 in FTSE 100 shares in an ISA today to make a million

The FTSE 100 (INDEXFTSE:UKX) could offer cheap shares and high returns that improve your chances of making a million, in my view.

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 your full annual ISA allowance of £20,000 in FTSE 100 shares may not necessarily produce high returns in the short run. The index’s recent performance suggests that it could experience a volatile period – especially since risks such as a second wave of coronavirus remain in place.

However, over the long run, buying FTSE 100 shares while they offer margins of safety could be a means of producing impressive growth rates. It could even help to make you a million at a time when few other mainstream assets offer attractive risk/reward opportunities.

FTSE 100 margin of safety

The FTSE 100 continues to trade significantly down on its 2020 starting price despite its recent rebound. This could be an opportunity for investors with a long time horizon to capitalise on low valuations across the index. Many sectors, including banking, retail and resources contain high-quality businesses that are facing the prospect of weak operating conditions. As such, they may offer margins of safety that produce favourable risk/reward opportunities.

Since the index has a sound track record of recovering from every one of its previous downturns, buying undervalued shares could be a sound move. It may allow you to capitalise on the volatile nature of the stock market to buy businesses when they are trading at low prices, and sell them when they occupy higher price points.

Dividend shares

Many FTSE 100 companies may not offer an especially attractive income opportunity in the short run. An uncertain economic outlook means that some companies have cancelled dividends, while others may be slow to raise them.

However, over the coming years, dividend shares could become increasingly popular. Low interest rates are set to make it increasingly challenging to generate a worthwhile passive income from your capital. This could boost demand for high-yielding stocks, as well as those companies that are able to post rising dividends in the coming years. The end result could be rising stock prices that further enhance your portfolio’s valuation.

Financial stability

As well as focusing on FTSE 100 stocks that offer margins of safety and dividend potential, investing in financially-stable companies could be a sound move. The economy is likely to be in a recession for at least part of 2020, which could mean that only the strongest businesses survive. Therefore, taking the time to assess a stock’s balance sheet and economic moat before buying it could be extremely effective in avoiding losses and making stronger gains.

Of course, a weak economic outlook means investor sentiment could shift rapidly. Therefore, there could be difficulties ahead for investors. But by adopting a long-term time horizon and buying high-quality income shares at low prices you can increase your chances of obtaining high returns. It may even lead to a seven-figure portfolio in the coming years.

Peter Stephens 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

Aston Martin DBX - rear pic of trunk
Investing Articles

There are hundreds of shares I’d rather buy than Aston Martin. Here’s why!

Aston Martin shares sell for pennies yet some of its cars can cost millions. So why doesn't this writer see…

Read more »

Young Caucasian man making doubtful face at camera
Investing Articles

3 risks to Greggs shares that could hamper a recovery

Greggs shares have a good dividend, but the price has performed weakly. Is our writer missing something by holding onto…

Read more »

ISA coins
Investing Articles

1 mighty FTSE dividend stock I’m considering for my ISA

A new ISA allowance has Paul Summers searching for strong and stable dividend stocks to add to his portfolio.

Read more »

Rolls-Royce's Pearl 10X engine series
Investing Articles

Are Rolls-Royce shares’ best days behind them?

Rolls-Royce shares have had a stellar few years. So far in 2026, though, they slightly lag the FTSE 100 blue-chip…

Read more »

A rear view of a female in a bright yellow coat walking along the historic street known as The Shambles in York, UK which is a popular tourist destination in this Yorkshire city.
Investing Articles

Buying £20k of Lloyds shares could give me an £851 income this year!

Lloyds has been one of the FTSE 100's hottest dividend growth shares in recent years. But do current risks make…

Read more »

Picturesque Cotswold village of Castle Combe, England
Investing Articles

ISA or SIPP? Some key differences to know

Ever wondered what some of the differences are between investing for retirement in a SIPP and in an ISA? Here…

Read more »

Young woman working at modern office. Technical price graph and indicator, red and green candlestick chart and stock trading computer screen background.
Investing Articles

2 world-class S&P 500 stocks down 11% and 32% to consider buying

Searching for stocks to buy for an ISA in April? Our writher thinks these excellent growth shares are worth a…

Read more »

View over Old Man Of Storr, Isle Of Skye, Scotland
Investing Articles

How much do you need in a Stocks and Shares ISA to aim for an annual income of £39,477?

Harvey Jones shows how ordinary investors can use their Stocks and Shares ISA allowance to build a generous passive income…

Read more »