How big must an ISA be to provide you with a £3,000 monthly second income?

Looking to build life-changing wealth for retirement? Here’s how a Stocks and Shares ISA could deliver a sustained second income.

| More on:
Stack of one pound coins falling over

Image source: Getty Images

When investing, your capital is at risk. The value of your investments can go down as well as up and you may get back less than you put in.

Read More

The content of this article is provided for information purposes only and is not intended to be, nor does it constitute, any form of personal advice. Investments in a currency other than sterling are exposed to currency exchange risk. Currency exchange rates are constantly changing, which may affect the value of the investment in sterling terms. You could lose money in sterling even if the stock price rises in the currency of origin. Stocks listed on overseas exchanges may be subject to additional dealing and exchange rate charges, and may have other tax implications, and may not provide the same, or any, regulatory protection as in the UK.

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 most people, a monthly second income of £3,000 could go a long way towards helping them achieving financial independence in retirement.

Given the ongoing debate about State Pension levels and eligibility, securing a supplementary income stream is essential, in my view. The good news is that securing a life-changing passive income is a realistic target with a well-diversified portfolio of global shares and other assets.

For a regular £3k monthly income, an investor may need a Stocks and Shares ISA of £900,000. That’s based on an annual drawdown rate of 4% that would likely provide a lasting income for life.

That looks like a colossal amount of cash. But as the thousands of stocks ISA millionaires in the UK will tell you, it’s quite possible with a patient and structured approach.

The ISA route

The first thing to say is that using a Stocks and Shares ISA is a critical part of building long-term wealth. It’s the most generous investing product on the planet, and Britons who are serious about building long-term wealth should give it a close look.

The £20,000 annual deposit limit is more than enough for most people. And they protect investors from the cost of paying capital gains tax and dividend tax, savings that can be invested instead to speed up the wealth-growing process.

What’s more, unlike other savings products (including the Self-Invested Personal Pension (or SIPP), individuals don’t have to pay income tax on withdrawals. As a consequence, investors don’t have to factor in tax grabs when calculating their portfolio targets.

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.

Stick to a plan

The second essential thing to think about is committing to making regular investments. Why? Because making your money work for you consistently over time is how wealth grows.

The typical Briton invests just over £500 a month in the stock market today. Those that can keep this up and achieve a 9% average annual return on their cash could turn this sum of money into £915,372 over 30 years.

A retirement fund of this size would comfortably support the £3,000 monthly passive income we’re targeting.

Is that sort of return possible in the real world, though? It’s important to note that many won’t achieve this. But given the average long-term stock market investor achieves 8% to 10%, the answer is yes, it can be done.

Building our portfolio

With an ISA set up and investment plan sorted, it’s time to think about what to buy.

There’s no one-size-fits-all approach here. We all have different risk tolerances and investing styles. But there’s one universal truth: investors who spread their cash across different share categories, regions and sectors and have a better chance of building wealth.

This is where diversified products like investment trusts and exchange-traded funds (ETFs) can help. The Polar Capital Technology Trust (LSE:PCT) is one that could supercharge portfolio growth and demands consideration, I feel.

It invests in 92 different global technology stocks. This reduces the impact of one or two underperformers on overall returns, whilst allowing investors to harness the full potential of fast-growing segments like artificial intelligence (AI), robotics, cybersecurity and quantum computing.

The trust’s excellent returns speak for themselves. Since 2015, it’s delivered an average annual return of 22.6%. That’s more than double the 9% target in our above example. I’m optimistic it can continue delivering, even though it can underperform during economic downturns.


Should you invest, the value of your investment may rise or fall and your capital is at risk. Before investing, your individual circumstances should be assessed. Consider taking independent financial advice.

Royston Wild 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

Snowing on Jubilee Gardens in London at dusk
Investing Articles

Will the stock market crash before Christmas?

Christmas is fast approaching. Could the uncertainty in the markets lead to a stock market crash before presents get opened?

Read more »

Portsmouth, England, June 2018, Portsmouth port in the late evening
Investing Articles

What will happen to the UK stock market in 2026? Here’s what experts think

UK stocks have had one of the best years of the century, but can that momentum continue into 2026? Our…

Read more »

Illustration of flames over a black background
Investing Articles

Why are investors on this trading platform piling in to an AI-threatened US stock?

James Beard tries to work out why this US stock’s attracting a lot of interest even though it could be…

Read more »

piggy bank, searching with binoculars
Investing Articles

Prediction: in 12 months the Persimmon share price and dividend could turn £10,000 into…

James Beard examines whether the Persimmon share price could stage a major recovery in 2026. And he looks at the…

Read more »

Percy Pig Ocado van outside distribution centre
Investing Articles

As the Ocado share price crashes, could it be a bargain?

The Ocado share price has plummeted -- and for a clear reason. Our writer considers whether this could be a…

Read more »

A front-view shot of a multi-ethnic family with two children walking down a city street on a cold December night.
Investing Articles

How on earth did this world-beating blue-chip growth stock crash 50% in five years?

Harvey Jones was a huge fan of this FTSE 100 growth stock for years but lately it has only inflicted…

Read more »

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

I asked ChatGPT to build the perfect Stocks and Shares ISA portfolio and it said…

Artificial intelligence (AI) may have its uses but when Harvey Jones asked it to build the ideal Stocks and Shares…

Read more »

Friends and sisters exploring the outdoors together in Cornwall. They are standing with their arms around each other at the coast.
Investing Articles

I asked ChatGPT what dividend shares I should buy for retirement. Its answer was amusing

Mark Hartley isn't convinced by ChatGPT’s attempt at picking dividend shares for retirement. But the results were entertaining nonetheless.

Read more »