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 £300 a month to make a £23,687 passive income for life

A diversified selection of quality shares invested over time can result in a chunky passive income. Our writer considers which shares to buy.

Middle-aged white man wearing glasses, staring into space over the top of his laptop in a coffee shop

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.

It might sound far-fetched to turn a modest sum of £300 a month into a chunky passive income stream. But it’s not. That said, there are some parameters that I’d use to try to get there.

In summary, the key components are time and investment return. Both would be needed to reach my goal.

XXX

A long-term passive income plan

The average investment return including dividends for the FTSE 100 is around 10% a year. That calculation goes back to when the Footsie was first created in 1984.

Bear in mind that future returns could differ. But given that this period included several recessions and a global financial crisis, I’m happy to use it as an estimate.

An equally important factor in the equation is time. By investing £300 a month in UK shares, I’m unlikely to reach my seemingly ambitious goal anytime soon. But if I set this to run continuously for the next 30 years, it becomes a much more realistic target.

With these assumptions, I’d end up with an investment pot totalling a whopping £592,178. Common industry thinking suggests that I could safely withdraw 4% of this sum every year for the rest of my life. That equates to an annual passive income of £23,687.

What to invest in?

One option is to buy a FTSE 100 index fund. This is an instrument designed to replicate the performance of this popular stock index.

Another option is to pick and choose a selection of the best shares. One benefit to this is that I could filter out any shares that I deem to be low-quality.

For a long-term portfolio, I’d look to build a diversified selection of shares. For instance, I’d want to own stocks from a variety of industries and styles. That way I wouldn’t be putting all my eggs in one basket.

History shows that small- and mid-cap shares often perform much better than large-cap stocks over time. That said, they are more volatile and less liquid. In contrast, large-cap shares can often be relatively slow and steady.

To capture these differing characteristics, I prefer to include all these types of shares in my portfolio.

Which shares?

If I had a spare £300 a month that I could devote to a long-term passive income plan, I’d buy the following shares today.

Large-cap selection: Rio Tinto, BP, Next, AstraZeneca, Experian, Diageo, and Legal & General Group.

Mid-cap selection: Games Workshop, Liontrust Asset Management, Howden Joinery, Greggs, and Vistry Group.

Small-cap selection: UP Global Sourcing Holdings, Robert Walters, Bloomsbury Publishing, and Zotefoams.

This strikes me as a high-quality, diversified, long-term portfolio. Highlighting its quality characteristics, it offers a return on capital employed of 22 and a 20% profit margin. It also benefits from a 4% dividend yield and a price-to-earnings ratio of 13.

Bear in mind that much can change in the world of business. New competition or technology might disrupt a company’s prospects. I’d need to monitor my portfolio to ensure long-term success.

Harshil Patel has positions in Bp P.l.c. The Motley Fool UK has recommended Bloomsbury Publishing Plc, Diageo Plc, Experian Plc, Games Workshop Group Plc, Howden Joinery Group Plc, and Liontrust Asset Management 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

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 »