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 my first £100 today to target an £11,687 passive income

If I were to invest my first £100 again, I’d avoid common pitfalls and target an £11,687 passive income with this wealth-building strategy

Young mixed-race woman looking out of the window with a look of consternation on her face

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.

My earliest attempt at building a passive income was a complete failure. I naively and optimistically put a few thousand pounds into a savings account with the hopes I’d get a decent chunk of cash back. My first month’s interest was about 40p. Safe to say, I wasn’t impressed. 

Throwing my life savings into a 0.5% interest account wasn’t my only mistake, but I’ve had a lot of success too. I’ve since watched the cash I invest multiply far more than I could get through cash savings or even property. I’m now on course to withdraw a sizable passive income one day that would never have been possible with other investments. 

XXX

Let’s say I was starting today with £100 and I wanted to build a passive income without wasting years spinning wheels and getting subpar returns. So here’s what I’d do to target a £11,687 yearly passive income. 

What to do

My first step would be to open a Stocks and Shares ISA so I can invest in the stock market. This would have sounded crazy to my younger self. After all, I’d only ever seen the stock market on television or in documentaries, usually where smooth-talking Americans lose millions of dollars. It seemed risky and not something I wanted a part of. 

What changed my mind was seeing how much money could be made with stocks. The MCSI World Index – like a tracker for the major stock markets of the globe – has grown at 10.6% on average in recent decades.

Other investments struggle to match that return, and aiming for 10% or more is the cornerstone of many passive income strategies. 

An eye on an income

And while 10% a year sounds like a decent chunk of change, it’s hard to overstate how rapidly the cash grows over long periods. To take an example, if I save £100 each month for 30 years, I end up with £36,000. Not too bad. But it won’t provide much in the way of a passive income.

Saving
1 year£1,200
5 years£6,000
10 years£12,000
20 years£24,000
30 years£36,000

But if I save that exact same amount and add 10.6% each year in the form of interest, I end up with £233,743. My investments reach as high as they do – over six times the amount I put in – through the compounding effect as I get ‘interest on the interest’. 

SavingInvesting
1 year£1,200£1,268
5 years£6,000£7,833
10 years£12,000£20,797
20 years£24,000£77,753
30 years£36,000£233,743

When it’s time to enjoy my passive income, I’d withdraw a smaller amount. Something like 5% can be achieved through dividends – many FTSE 100 stocks offer a higher return – which could bring me a passive income of £11,687 each year. 

As nice as working towards a passive income sounds, there are no guarantees here. Past performance is not guaranteed to continue, and I can lose money investing this way. On balance though, I feel there is no better place for my money. 

Passive income it is, then!

John Fieldsend has no position in any of the shares mentioned. 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 »