£40K in savings? Here’s how I’d aim to turn that into a second income of £20K a year!

Could this writer earn a £20,000 second income by investing £40,000 wisely today and taking the long-term view? He thinks so.

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.

Couple working from home while daughter watches video on smartphone with headphones on

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.

A second income could come in handy for many people.

But not everyone would want to take a second job to earn it. Fortunately, that is not always necessary. Some people earn a second income through investing in shares and letting major FTSE 100 companies like Shell and Unilever do the hard work on their behalf!

Using such an approach, I think I could aim to turn a lump sum of £40,000 today into a £20,000 annual second income down the line. Here’s how.

The principle of dividends

At the heart of this approach are dividends.

They are basically a way for a company to share its excess cash out among shareholders. Not all companies pay dividends and even those that do can stop at any moment.

So I invest in a diversified range of shares. I focus on finding businesses that I think enjoy a competitive advantage in an area I expect to benefit from long-term customer demand. I also check to see if there is anything that might stop a firm paying a dividend, like a lot of debt on its balance sheet.

Compounding

Still, even if invested in shares that pay large dividends, generating an annual £20,000 from £40,000 seems like a tall order.

That suggests a dividend yield of 50%. But most FTSE 100 companies have yields closer to 3% or 4%. None pays 50% (or anything near it).

That is where the principle of compounding can help me.

It is basically reinvesting the dividends, so that in turn they too earn dividends without me having to put any more money into my investment.

As an example, imagine I own a portfolio of shares with an average yield of 8%. My initial investment is £40,000. By compounding, after 24 years I should be generating over £20,000 of dividends annually.

That does mean that I will need to be patient. If I compound all my dividends until I earn £20,000 annually, I may not be able to draw my second income for decades. But when I do, it could be substantial.

Getting started

Whatever my timeframe, I would get going today.

My first move would be to open a share-dealing account or Stocks and Shares ISA.

Then I would start looking for the sort of shares that meet my objective.

My preference would be for well-established companies with a proven business model and long-term income potential. I would not just focus on dividends. They can always be cut, after all.

I would dig into a company’s accounts and figure out for myself what sort of profits I think it could make in future – and what that might mean for dividends.

C Ruane has no position in any of the shares mentioned. The Motley Fool UK has recommended Unilever 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

Portrait of elderly man wearing white denim shirt and glasses looking up with hand on chin. Thoughtful senior entrepreneur, studio shot against grey background.
Investing Articles

Could these FTSE 100 losers be among the best stocks to buy in 2026?

In the absence of any disasters, Paul Summers wonders if some of the worst-performing shares in FTSE 100 this year…

Read more »

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

Up 184% this year, what might this FTSE 100 share do in 2026?

This FTSE 100 share has almost tripled in value since the start of the year. Our writer explains why --…

Read more »

Close-up as a woman counts out modern British banknotes.
Investing Articles

You can save £100 a month for 30 years to target a £2,000 a year second income, or…

It’s never too early – or too late – to start working on building a second income. But there’s a…

Read more »

Hydrogen testing at DLR Cologne
Investing Articles

Forget Rolls-Royce shares! 2 FTSE 100 stocks tipped to soar in 2026

Rolls-Royce's share price is expected to slow rapidly after 2025's stunning gains. Here are two top FTSE 100 shares now…

Read more »

Road 2025 to 2032 new year direction concept
Investing Articles

Brokers think this 83p FTSE 100 stock could soar 40% next year!

Mark Hartley takes a look at the factors driving high expectations for one major FTSE 100 retail stock – is…

Read more »

Investing Articles

I asked ChatGPT for the best FTSE 100 shares to consider for 2026, and it said…

Whatever an individual investor's favourite strategy, I reckon there's something for everyone among the shares in the FTSE 100.

Read more »

Investing Articles

3 FTSE 100 powerhouses to consider buying for passive income in 2026

Looking to start earning passive income in 2026? Paul Summers picks out three dividend heroes to consider from the UK's…

Read more »

Growth Shares

2 growth shares that I think are very exposed to a 2026 stock market crash

Despite not seeing any immediate signs of a stock market crash, Jon Smith points out a couple of stocks he's…

Read more »