Share your opinion and earn yourself a free Motley Fool premium report!

We are looking for Fools to join a 75 minute online independent market research forum on 15th / 16th December.

To find out more and express your interest please click here

Investing £20,000 in an ISA could one day give an investor £1,564 monthly passive income for life

Harvey Jones looks at how investors can use their Stocks and Shares ISA allowance to build a high and rising passive income over time, and beat returns on cash.

| 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.

A senior man using hiking poles, on a hike on a coastal path along the coastline of Cornwall. He is looking away from the camera at the view.

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.

The Stocks and Shares ISA allowance is a brilliant way to generate passive income because it’s 100% tax-free. Investors get to keep every penny of the dividends they earn, and there’s no need to include ISAs on tax returns.

Many people play safe by generating income from a Cash ISA, which is essentially a tax-free savings account. With interest rates relatively high, they can currently get up to 4.5% a year on a one-year fixed-rate Cash ISA or 4.2% fixed for five years. And their capital’s secure.

I’m using my Stocks and Shares ISA for tax-free wealth

Personally, I don’t take that route. While I keep some cash on easy access for emergencies, my long-term savings are all invested in the stock market. For me, it’s a no-brainer.

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.

Moneyfacts figures show the average annual total return from a Stocks and Shares ISA over the past decade is 9.6% a year. This includes both share price growth and dividend income. By comparison, the average Cash ISA returned just 1.2% annually.

While today’s higher interest rates may narrow the gap, savings accounts are unlikely to match the long-term total return of shares. 

Of course, stock markets can be volatile in the short term, which is why I never invest with less than a five-year time horizon. The real rewards come over decades. That’s how I’m building wealth for retirement.

The blue-chip FTSE 100 index is filled with fantastic high-yielding shares like insurer Aviva (LSE: AV), which currently offers a trailing dividend yield of 6.77%. Over the past year, its shares have climbed more than 14%. Combined, that would have delivered a total return of over 21%.

Neither the share price nor dividend is guaranteed. Aviva’s share price could fall in the next 12 months for all anyone knows. However, the company seems well-positioned. Its board has been streamlining operations and focusing on core markets in the UK, Ireland, and Canada. This should boost efficiency.

The shares come with a dazzling yield

Additionally, demand for retirement and investment products is growing as the population ages. Aviva operates in the competitive financial services sector, and factors like economic downturns or market instability could hit profitability. Yet over the long run, I expect its dividend and share price to rise steadily.

It’s wise to spread risk across 10-15 dividend-paying stocks, in the hope that if one or two underperform, others will more than compensate.

Let’s say an investor puts their £20,000 ISA allowance into shares growing by 9.6% annually. After 20 years, they’d have £125,000. Staying invested for 30 years would increase this to an impressive £312,857.

If those shares yielded an average second income of 6%, they’d generate £18,771 a year. And that’s without touching the capital. It works out as £1,564 a month. Not bad from an initial £20k. And with luck, the income would grow over time. I do think it’s worth further research.

To me, that makes a compelling case for investing in a Stocks and Shares ISA over cash.

Harvey Jones 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

Rolls-Royce's Pearl 10X engine series
Investing Articles

Can the Rolls-Royce share price do it again in 2026?

Can the Rolls-Royce share price do it again? The FTSE 100 company has been a star performer in recent years…

Read more »

Businessman hand flipping wooden block cube from 2024 to 2025 on coins
Investing Articles

After huge gains for S&P 500 tech stocks in 2025, here are 4 moves I’m making to protect my ISA and SIPP

Gains from S&P tech stocks have boosted Edward Sheldon’s retirement accounts this year. Here’s what he’s doing now to reduce…

Read more »

View of Lake District. English countryside with fields in the foreground and a lake and hills behind.
Investing Articles

With a 3.2% yield, has the FTSE 100 become a wasteland for passive income investors?

With dividend yields where they are at the moment, should passive income investors take a look at the bond market…

Read more »

Smart young brown businesswoman working from home on a laptop
Investing Articles

Should I add this dynamic FTSE 250 newcomer to my Stocks and Shares ISA?

At first sight, a UK bank that’s joining the FTSE 250 isn’t anything to get excited by. But beneath the…

Read more »

Investing Articles

£10,000 invested in BT shares 3 months ago is now worth

BT shares have been volatile lately and Harvey Jones is wondering whether now is a good time to buy the…

Read more »

Person holding magnifying glass over important document, reading the small print
Investing Articles

After a 66% fall, this under-the-radar growth stock looks like brilliant value to me

Undervalued growth stocks can be outstanding investments. And Stephen Wright thinks he has one in a company analysts seem to…

Read more »

Content white businesswoman being congratulated by colleagues at her retirement party
Investing Articles

Don’t ‘save’ for retirement! Invest in dirt cheap UK shares to aim for a better lifestyle

Investing in high-quality and undervalued UK shares could deliver far better results when building wealth for retirement. Here's how.

Read more »

Black woman using smartphone at home, watching stock charts.
Investing Articles

1 growth and 1 income stock to kickstart a passive income stream

Diversification is key to achieving sustainable passive income. Mark Hartley details two broadly different stocks for beginners.

Read more »