We have some exciting news to share! The Motley Fool UK has now become The Twelfth Magpie -- an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. This site is our new home, and there will be extra tweaks made across the coming few days as we settle in. So if anything looks a little off, please bear with us!

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.

How I’d aim to build a million-pound portfolio in a Stocks and Shares ISA

Thousands of ordinary British investors have become Stocks and Shares ISA millionaires. Here’s how I’d look to follow their example.

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

Image source: Getty Images

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.

The first thing I’d say is that it really is possible to build a £1m Stocks and Shares ISA portfolio, because thousands of Britons have done just that. The next thing I’d say is that it isn’t easy. Anybody who wants to build this mighty sum would have to work at it.

Most important of all, it takes time. Anybody who thinks it can be done with some huge investment coup such as buying an early stage Amazon or Tesla then selling at the right time is deluded. The odds of doing that are slim. Luckily, there’s a better way to build a tax-free million inside a Stocks and Shares ISA.

XXX

Stocks and Shares ISA millionaires take their time

Forget trying to get rich quick, long-term investors know that the key is to take it slow. Those annual ISA contributions need plenty of time to compound and grow.

Currently, we can all invest a maximum of £20,000 a year inside a Stocks and Shares ISA. Maxing out the allowance every year is essential for those taking a shot at a million. Somebody who does that every year would become an ISA millionaire after 22 years, assuming their money grew at 7% a year. That’s roughly the long-term annual return from investing in FTSE 100 shares, with dividends reinvested.

Instead of an impossibility, becoming a millionaire starts to look like a mathematical certainty. But nothing is certain when it comes to investing. There is no guarantee that the FTSE 100 or any other index will deliver 7% a year (although history suggests they usually do). 

The other big issue is that would-be millionaires may not have £20k a year and a 23-year timeframe at their disposable. That doesn’t mean they can’t do it, though. It is possible to beat the FTSE 100, by investing in individual companies listed on the index. 

That’s how Motley Fool investors do it. Rather than buying trackers, we believe in scouring the index for exciting company stocks that we think can outperform. These don’t have to be whizzy growth stocks, either.

I would start my quest to make a million by investing in FTSE 100 stocks offering high yields. For example, housebuilder Barratt Developments currently offers dividend income of 8.52% a year. That yield should roll up nicely over the years, with any share price growth on top.

Insurer Aviva yields 8.37% and fund manager M&G yields 9.51%. When their shares start to grow, too, the total return should multiply.

These are just three names picked out at random. If I was aiming to build a £1m fortune, I would want to build a diversified spread of about 15 different income, growth, and value stocks. One or two are bound to disappoint, but hopefully the winners will more than offset the losers.

There is no guarantee that I would make a million, but one thing is pretty certain. I’d be a lot richer for trying.

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.

Harvey Jones doesn't hold any of the shares mentioned in this article. 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

Friends and sisters exploring the outdoors together in Cornwall. They are standing with their arms around each other at the coast.
Investing Articles

£503 buys 14 shares in this FTSE 250 stock that returned 23.9% annually for the last 15 years

This FTSE 250 stock has averaged a huge return for 15 years. At today's price, £503 buys 14 shares. But…

Read more »

Black woman using loudspeaker to be heard
Investing Articles

£1,000 buys 25 shares in this FTSE 100 stock that’s returned 29.2% annually for the last 10 years

This FTSE 100 mining stock has returned close to 30% a year for a decade. At 3,995p, £1,000 buys 25…

Read more »

Female student sitting at the steps and using laptop
Investing Articles

Down 47%, is this growth stock finally worth buying in May?

With a £288m order book and a hidden pipeline of defence and nuclear contracts, is this growth stock now too…

Read more »

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

2 REITs yielding 7%+ to consider for passive income in 2026

A REIT backed by the NHS and another backed by Tesco and Sainsbury's with both yielding 7%+. Here's why I'm…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

Just 97 shares of this UK dividend stock generate £238 in passive income

A 5.7% yield, £238 in passive income from just 97 shares, and one of the most divisive dividend stocks on…

Read more »

ISA coins
Investing Articles

£10,000 in an ISA generates a second income of…

The London Stock Exchange is home to some of the world's most generous dividends. But how big a second income…

Read more »

Shot of a senior man drinking coffee and looking thoughtfully out of a window
Investing Articles

Expert recommendations: 2 top income stocks yielding 7%+!

With yields of 7.2% and 7.8% respectively, these two income stocks are catching the eyes of institutional analysts. Should investors…

Read more »

Illustration of flames over a black background
Investing Articles

3 top income-focused stocks to buy in May 2026, according to experts

Looking for a stock to buy for income in May 2026? Experts have flagged these three UK dividend shares as…

Read more »