How to invest £500 in an ISA and aim for a £90,000 second income

Millions of us invest for a second income and our writer believes there’s never a better time to get started than now.

| 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.

Black woman using smartphone at home, watching stock charts.

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.

For many of us, a second income’s about achieving financial stability and gaining peace of mind. It’s also something that could allow us to work less or put more money aside for things like holidays.

With an Individual Savings Account (ISA), UK residents can invest as little as £100 a month and set themselves on a path to potentially earning a substantial second income.

Personally, I believe there’s no better time to start than now, despite the FTSE 100 being at elevated levels.

Market conditions may fluctuate, but by investing strategically and with a long-term perspective, investors can navigate these ups and downs. 

How should I invest £500 a month?

The more I can invest in a Stocks and Shares ISA monthly, the better chance I have of building a large portfolio that can deliver a life-changing passive income.

And consistency is important. By regularly putting £500 a month into a Stocks and Shares ISA, investors harness the power of compound returns, and this can be truly game changing.

Over time, the returns on my investments generate their own returns, accelerating my portfolio’s growth. Additionally, regular investments allow me to benefit from pound-cost averaging, smoothing out market volatility.

When it all goes to plan

When we invest wisely, we can achieve returns that are far in excess of what we may be able to achieve in a regular savings account.

Many investors will look to the benchmark of achieving at least 10% growth every year. Some of this will come in the form of dividends, and some in share price growth.

So this is how my £500 a month could grow if I achieved 10% annually. I’ve also assumed that the contributions could grow at 2% annually, in line with the Bank of England’s inflation target.

Created at thecalculatorsite.com

With £1.33m after 30 years, I could generate around £90,000 annually as a second income, noting the kind of dividend yields we see today.

Investing wisely

But if we invest poorly, we could lose money. That’s why I always invest in carefully-researched stocks and bonds, investments recommended by great stock pickers, or Exchange-Traded Funds (ETFs). Investors should also consider index tracker funds.

So what’s a wise investment? Well, as someone who has the time to research stocks, I tend to invest in individual companies I think have great potential, like Super Micro Computer, a leader in the artificial intelligence (AI) server and data centre segment.

However, investors with less time may prefer to invest in ETFs like iShares Semiconductor (NASDAQ:SOXX). This ETF seeks to track the investment results of an index composed of US-listed equities in the semiconductor sector.

Since its inception, it’s achieved annualised total returns of 12.05%. But it’s performance is even better in recent years, with annualised total returns of 25.4% over the last decade.

Some analysts may suggest that semiconductor stocks, like Nvidia, are getting a little expensive. But it’s equally the case that the market’s forecasting a long period of rapid and sustained growth.

Its top investments include Broadcom — an American chip designer and manufacturer — Nvidia, AMD, and Applied Materials. It also has holdings in semiconductor giant TSMC. I think it’s one to consider.

James Fox has positions in Nvidia and Super Micro Computer. The Motley Fool UK has recommended Advanced Micro Devices, Nvidia, and Taiwan Semiconductor Manufacturing. 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

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.
Investing Articles

Is Diageo quietly turning into a top dividend share like British American Tobacco?

Smoking may be dying out but British American Tobacco remains a top dividend share. Harvey Jones wonders if ailing spirits…

Read more »

Young woman holding up three fingers
Investing Articles

Just released: our 3 top income-focused stocks to consider buying in December [PREMIUM PICKS]

Our goal here is to highlight some of our past recommendations that we think are of particular interest today, due…

Read more »

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

Tesco’s share price: is boring brilliant?

Tesco delivers steady profits, dividends, and market share gains. So is its share price undervaluing the resilience of Britain’s biggest…

Read more »

Businessman hand stacking money coins with virtual percentage icons
Investing Articles

1 huge takeaway from the Martin Lewis investing presentation

Martin Lewis showed how returns from stocks have smashed the returns from cash savings over the last decade. But here’s…

Read more »

Middle aged businesswoman using laptop while working from home
Investing For Beginners

I think the best days for Lloyds’ share price are over. Here’s why

Jon Smith explains why Lloyds' share price could come under increasing pressure over the coming year, with factors including a…

Read more »

A graph made of neon tubes in a room
Investing Articles

£5,000 invested in the FTSE 100 at the start of 2025 is now worth…

Looking to invest in the FTSE 100? Royston Wild believes buying individual shares could be the best way to target…

Read more »

Thoughtful man using his phone while riding on a train and looking through the window
Investing Articles

Can the BAE share price do it again in 2026?

The BAE share price has been in good form in 2025. But Paul Summers says a high valuation might be…

Read more »

Investing Articles

Can Rolls-Royce, Babcock, and BAE Systems shares do it all over again in 2026?

Harvey Jones examines whether BAE Systems and other defence-focused FTSE 100 stocks can continue to shoot the lights out in…

Read more »