How I’d invest £20,000 in a Stocks and Shares ISA in March to aim for a million

For UK investors, the Stocks and Shares ISA allowance resets in April. Here’s what Stephen Wright would buy in March to use this year’s allowance.

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.

Senior woman potting plant in garden at home

Image source: Getty Images

Key Points
  • Investing £20,000 a year compounds to £1m at a 4% growth rate
  • Dividend shares allow investors to increase the number of shares they own by reinvesting their income
  • Growth stocks increase in value as the company reinvests its profits internally

March is just about the last chance for UK investors to use this year’s Stocks and Shares ISA allowance. I think if someone uses their full allowance each year for 30 years, becoming a millionaire is a realistic aim.

Building a £1m portfolio over 30 years using annual deposits of £20,000 involves earning a 4% annual return for every one of those years. Despite the FTSE 100 this year being more expensive than it’s ever been, I think that’s still achievable.

Dividends

One way of becoming an ISA millionaire is by investing in dividend stocks. These are shares in companies that distribute part of their income to shareholders.

Using this approach, I could reinvest the money I received to buy more shares, increasing my future dividends. And I could keep doing this until I reached a million.

The easiest way to do this involves buying stocks offering a return above 4% today and hoping that the business maintains its payouts in the future. Taking this approach, I’d buy shares in Legal & General.

At today’s prices, the stock has a dividend yield of 8%. As long as the company’s payments don’t fall significantly, I should achieve my target. 

Growth

Instead of increasing the value of my portfolio by buying more shares, I could also look to buy shares that will increase in value. This involves investing in growth stocks.

Shares in growth companies increase in value because the businesses retain their earnings and reinvest them to generate more cash in future. As a result, the value of their stock should increase.

If I were taking this approach, I’d buy shares in Halma. It does pay a dividend, but its real value comes from the growth of its business.

Over the last decade, the company has increased its earnings per share by an average of 10% a year.  If it can continue to do so, it could get me to my target after 30 years.

Aiming for a million

There are different strategies I could try. But there’s no rule that says I have to stick to only one of them.

When I invest, I try to focus on whatever I think the best opportunity is. Sometimes that’s a dividend stock and sometimes it’s a growth stock. 

Doing this allows me to develop a diversified investment portfolio. By concentrating on whatever I think the best opportunity at the time is, I’ll eventually have a collection of different investments.

If I were investing £20,000 in March, I’d probably look to buy shares in Diploma. The stock has a dividend yield of around 2%, but it’s real attraction is as a growth stock.

Diploma’s revenue has grown at an average of 13% per year over the last decade. And the company’s size means I think it can continue for some time, helping me reach my million pound target.

Please note that tax treatment depends on the individual circumstances of each client and may be subject to change in future. The content in this article is provided for information purposes only. It is not intended to be, neither does it constitute, any form of tax advice. Readers are responsible for carrying out their own due diligence and for obtaining professional advice before making any investment decisions.

Stephen Wright has positions in Diploma Plc. The Motley Fool UK has recommended Halma Plc. 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

Businessman hand stacking money coins with virtual percentage icons
Investing Articles

Here’s what could send Greggs shares climbing again

Greggs shares are down after investor optimism was hit head-on by a dose of financial reality. The wheels could be…

Read more »

Investing Articles

Suddenly investors can’t get enough of GSK shares! What’s going on?

After years in the doldrums, GSK shares are suddenly the most bought stock on the entire FTSE 100. Harvey Jones…

Read more »

'2024' art concept overlaid on a stock screener
Investing Articles

£5,000 invested in Greggs shares in October 2024 is now worth…

Despite facing a multitude of challenges today, might Greggs' stock be worth a look after losing well over a third…

Read more »

Investor looking at stock graph on a tablet with their finger hovering over the Buy button
Investing Articles

Where will Rolls-Royce shares go next? Let’s ask the experts

Rolls-Royce shares have wobbled as aviation uncertainty grows. But can the City's glowing forecasts help get the price climbing again?

Read more »

Two female adult friends walking through the city streets at Christmas. They are talking and smiling as they do some Christmas shopping.
Investing Articles

No savings at 45? Here’s how investors could still build a £17,360 second income

It’s never too late to start investing, and with compounding working over time, Andrew Mackie shows how investors could still…

Read more »

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

How to invest £10,000 to aim for a £6,108 annual passive income

UK REITs have been getting a lot of attention. But our author thinks they're still the place to look for…

Read more »

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

What sort of passive income stream could you build for a fiver a day?

Think a few pounds a day might not go far? In fact, that could be the basis of some pleasing…

Read more »

British Isles on nautical map
Investing Articles

I sense a potential opportunity if the FTSE 100 loses this quality growth stock…

Rightmove falling out of the FTSE 100 might have been unthinkable a year ago. But that's the reality investors are…

Read more »