How I’d invest a £20,000 Stocks and Shares ISA to try and build long-term wealth

Christopher Ruane reckons he could aim for big rewards by investing a £20,000 Stocks and Shares ISA in the right way. Here he shares his thinking.

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.

Businessman use electronic pen writing rising colorful graph from 2023 to 2024 year of business planning and stock investment growth concept.

Image source: Getty Images

Different people have their own investment objectives when it comes to their Stocks and Shares ISA. As a long-term investor, I think an ISA can be a good vehicle to try and build wealth over the course of years or decades.

If I had £20,000 to put into a Stocks and Shares ISA at the moment, with that goal, here is how I would go about it.

Setting objectives: growth, income, or both

My first move would be to get clear on what I really wanted my ISA to do for me. Simply imagining buying good shares is not an objective in itself.

Rather, I would decide what my focus was. Do I want to zoom in on shares I think could benefit from strong growth of the business in years to come? Should I instead concern myself less with growth and go for some big dividend payers? Or might a balance of growth and income shares make sense for me?

Right now, there are certainly some strong dividend payers even among the ranks of blue-chip FTSE 100 shares. Vodafone announced its latest dividend this week, for example, maintaining its 10.8% yield.

But while I would be happy to have some juicy dividend payers in my Stocks and Shares ISA, I am also keen to tap into some growth opportunities. So as with my current ISA, I would invest in both growth and income shares.

Compounding dividends

If I make the right choices, hopefully the growth shares can increase in value over time.

If my investment thesis about any of them changes at some point, I may sell them and use the proceeds to buy others. At all times, I would maintain a diversified Stocks and Shares ISA.

But what about the income I earn from dividend shares? It could be tempting to take this out of the ISA as I go and use it as a form of passive income.

But with the objective of building wealth, I think it makes more sense to keep the dividends inside the ISA and use them to buy more shares.

That is known as compounding and could be a powerful way to build wealth.

Take that 10.8% dividend yield for example. If I compound £1,000 at 10.8% for a decade, it would be worth almost £2,800. Over two decades that sum would jump to over £7,700 and after three decades, over £21,000!

Compounding can illustrate the value of a long-term approach to investing.

Building wealth from an ISA

What if I compounded the whole £20,000 at 10.8% for three decades? After 30 years, my ISA would be worth over half a million pounds. That would be despite me only having invested £20,000 in it, as well as reinvesting dividends.

A compound annual growth rate of 10.8% is not easy to achieve over a 30-year period, admittedly. But if I can focus on finding the right mixture of high-quality shares at good prices, my Stocks and Shares ISA could put me over halfway towards being a millionaire!

C Ruane has positions in Vodafone Group Public. The Motley Fool UK has recommended Vodafone Group Public. 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

British pound data
Investing Articles

The red lights are flashing again for Lloyds’ share price! Here’s why

Lloyds' share price continues to defy gravity. But Royston Wild thinks it's only a matter of time before the FTSE…

Read more »

Aston Martin DBX - rear pic of trunk
Investing Articles

Aston Martin shares are now only 41p!

Aston Martin shares just dropped to around the 41p mark! Is this a brilliant buying opportunity or a stock that…

Read more »

Artillery rocket system aimed to the sky and soldiers at sunset.
Investing Articles

Up 325% in 5 years! But are BAE System shares still a no-brainer buy?

BAE Systems shares would have been a brilliant buy five years ago. But could they still offer excellent returns if…

Read more »

Investing Articles

How much do you need to invest each month into FTSE 100 shares to aim for a million?

Simply by putting a few hundred pounds a month into FTSE 100 shares, how might someone aim to become a…

Read more »

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

£10,000 invested in BAE shares at the beginning of 2026 is now worth…

Paul Summers tips his hat to those who invested in BAE Systems shares when markets opened back up in January.…

Read more »

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.
Investing Articles

What size ISA do you need for £250-a-week retirement income?

Harvey Jones outlines the advantages of investing in a Stocks and Shares ISA rather than leaving money in cash, and…

Read more »

Mature Caucasian woman sat at a table with coffee and laptop while making notes on paper
Investing Articles

£5,000 invested in Legal & General shares 5 years ago is now worth…

Harvey Jones crunches the numbers to show how much an investor would have earned from Legal & General shares lately,…

Read more »

Investing Articles

Just check out the latest bumper forecasts for Lloyds, NatWest and Barclays shares

Harvey Jones says Barclays shares have had a terrific year and there could be more action to come. So what's…

Read more »