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 invest £350 a month in a Stocks and Shares ISA to aim for a million

Targeting a £1m Stocks and Shares ISA, our writer looks at what it would take to reach this goal if he invested regularly.

A young Asian woman holding up her index finger

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.

Recession risks are rising, borrowing costs are soaring and investors are nervous amid market turmoil. So why should I invest in a Stocks and Shares ISA right now?

Times of crisis can often create opportunities. Share prices can fall in the short term due to temporary factors. But as a long-term investor, I can somewhat ignore near-term price swings.

XXX

Timing the market and trying to buy at the bottom is notoriously difficult. One of the golden rules of long-term investing is said to be, “time in the market beats timing the market”.

It suggests that investing consistently for many years should give a better return than selling in times of crisis with the hoping of buying back later.

If I had the spare cash and wanted to start investing in a Stocks and Shares ISA today, here’s what I’d do.

Aiming for a £1m Stocks and Shares ISA

First, I’d invest consistently and regularly. That way, even if share prices fall in the near term, I can rest assured that my automated plan is picking up cheap shares.

History shows that over long periods, average stock market returns have been around 8%-10% a year. Although future returns aren’t guaranteed, I’d use this figure as an estimate.

I’d like to aim for a £1m Stocks and Shares ISA. But to do so, I’d need to invest for many years. I calculate that if I invest £350 every month for 35 years, I could have a pot worth around £1.1m.

What to invest in?

I could invest in a FTSE 100 or S&P500 index fund. They would track the largest UK and US stocks.

Alternatively, I could pick and choose my own shares. Many have achieved a far greater than average return over the years.

With some reading and research, I’d look for shares that could perform well over the coming years and decades.

More specifically, I’d look for high-quality businesses that offer strong profit margins and a solid competitive advantage. This could be in the form of patents, customer relationships or a brand.

I’d look for a double-digit return on capital employed. That’s a key measure of a quality business, in my opinion. It demonstrates how efficiently a company uses its capital.

Next, I’d like to own a mixture of stocks that span growth, value, and income. Over time, one category might perform better than another. For instance, this year, value stocks have performed far better than growth stocks. But that won’t always be the case.

Top picks

Right now, the FTSE 100 includes several of the shares that I’d buy if I had £350 a month to add to my ISA. These include analytics business RELX, equipment rental company Ashtead, and defence leader BAE Systems.

On average, these three shares offer a return on capital employed of 16%, and a tasty 20% profit margin. Their performances over the past decade have been remarkable. If I’d bought all three shares exactly 10 years ago, I’d have achieved a return of 19% a year.

Although the result could be very different over the coming decades, if I can consistently find such gems, I could potentially achieve my £1m goal much earlier than planned.

Harshil Patel has no position in any of the shares mentioned. The Motley Fool UK has recommended RELX. 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 »