Here’s how you could aim to turn £20,000 into a £7,400 yearly second income

We’d all like a second income to help fund our daily expenses, right? I take a look at what my favoured strategy might achieve.

| More on:

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.

Businessman hand stacking money coins with virtual percentage icons

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.

If we want to build up a long-term second income, our annual £20,000 ISA allowance means we could do it without paying any tax on the gains we make.

Government data shows the amount of cash put into ISAs has been declining since the 2014/15 year. But the good news is the proportion of wealth in Stocks and Shares ISAs has grown in comparison to Cash ISAs.

High interest rates make Cash ISAs look more attractive. And it can make sense to use one for shorter-term needs. Also, some savers don’t want any stock market risk and will priortise the safety of a guaranteed return.

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.

Long-term best?

For more than a century, the UK stock market had strongly outperformed cash-based savings. But what difference does a few percent either way make in reality? If we invest for the long term, it can mean quite a lot.

Consider £20,000 put into two different investments. One pays a 4.4% return every year, with the other offering 8%. Each year, we reinvest the income we receive into more of the same thing without adding any new money.

By my calculations, the £20,000 earning 4.4% per year should more than double to over £47,000 in 20 years. And the same 4.4% return could then earn an annual second income of a bit over £2,000.

But the investment paying 8% in annual returns could grow to £93,000 over the same 20 years. And 8% of that could then mean £7,400 income per year. So, an 80% better annual return could result in more than three-and-a-half times the eventual yearly second income.

Stocks beat cash

Why did I pick these two figures? They’re not just off the top of my head. No, the 4.4% is about what the best Cash ISAs I can find today are offering — likely to fall following future Bank of England cuts.

And the 8% is the current forecast dividend yield from M&G (LSE: MNG) shares — forecast to rise gradually in the next few years.

Do I suggest putting a whole ISA allowance into a single stock like M&G? No, most definitely not. I wouldn’t do that with any stock, and instead I reckon diversification across a range of businesses is essential.

Long-term diversification

We also shouldn’t depend on today’s dividend level. Stock market dividends are never guaranteed. And in tough times they can even be cut altogether.

M&G is in the savings and investment business, and can be at the mercy of stock market risk more than others. And it’s been a separate company in its own right only since being spun out from Prudential in 2019. So there’s not much of a track record yet.

But I do hope this comparison might raise a few thoughts. Investors seeking a second income should be aware that stocks and shares have beaten cash savings over the long term. And I rate M&G as one to consider as part of a diversified Stocks and Shares ISA.

The not-a-secret is to invest as much as we can each year, and keep going as long as we can.

Alan Oscroft has no position in any of the shares mentioned. The Motley Fool UK has recommended M&g Plc and Prudential 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

Warren Buffett at a Berkshire Hathaway AGM
Investing Articles

Want to be a hit in the stock market? Here are 3 things super-successful investors do

Dreaming of strong performance when investing in the stock market? Christopher Ruane shares a trio of approaches used by some…

Read more »

Two white male workmen working on site at an oil rig
Investing Articles

The BP share price has been on a roller coaster, but where will it go next?

Analysts remain upbeat about 2026 prospects for the BP share price, even as an oil glut threatens and the price…

Read more »

Investing Articles

Prediction: move over Rolls-Royce, the BAE share price could climb another 45% in 2026

The BAE Systems share price has had a cracking run in 2025, but might the optimism be starting to slip…

Read more »

Tesla car at super charger station
Investing Articles

Will 2026 be make-or-break for the Tesla share price?

So what about the Tesla share price: does it indicate a long-term must-buy tech marvel, or a money pit for…

Read more »

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

Apple CEO Tim Cook just put $3m into this S&P 500 stock! Time to buy?

One household-name S&P 500 stock has crashed 65% inside five years. Yet Apple's billionaire CEO sees value and has been…

Read more »

Dividend Shares

How much do you need in an ISA to make £1,000 of passive income in 2026?

Jon Smith looks at how an investor could go from a standing start to generating £1,000 in passive income for…

Read more »

Investing Articles

Can the Lloyds share price hit £1.30 in 2026?

Can the Lloyds share price reproduce its 2025 performance in the year ahead? Stephen Wright thinks investors shouldn’t be too…

Read more »

Young woman working at modern office. Technical price graph and indicator, red and green candlestick chart and stock trading computer screen background.
Investing Articles

Down 45%, is it time to consider buying shares in this dominant tech company?

In today’s stock market, it’s worth looking for opportunities to buy shares created by investors being more confident about AI…

Read more »