How I’d invest £20,000 in an ISA to earn passive income for life

Here’s my two-part strategy for building a portfolio of stock investments in a Stocks and Shares ISA aimed at achieving lifelong passive income.

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.

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 new ISA allowance will be available to us on 6 April. This year it’s been held flat at £20,000. But I see it as an opportunity to build passive income.

Sadly, the allowance doesn’t mean the government is giving us £20k! But it does mean we can invest up to £20k of our own money in an ISA. And we may do so until 5 April 2023. And then the allowance will renew. However, ISA allowances may change in the future. And it’s even possible the government could alter the tax advantages provided.

Aiming for passive income for life

Right now, any gains made within an ISA are tax-free. So I’m keen to put as much as I can into a Stocks and Shares ISA. And although the full annual allowance is £20k, we can invest as much as we like up to that limit during the year.

Once the money is in, we can invest it in shares whenever we choose. For example, we don’t have to invest all the money immediately. However, I see a big opportunity developing in the stock market because of the current correction. So I’m keen to get started and will likely invest some of my new allowance in April.

The primary aim of my programme of investment will be to earn passive income for life. And the income will arrive in the form of shareholder dividends paid by my investee companies. However, I want my investments to grow first so the eventual stream of passive income will be as large as possible. And that means I’m in the building stage of my portfolio.

To begin with, I’ll reinvest all dividends and other gains to ensure the process of compounding is working for me. And my approach to building a portfolio of investments will have two pathways.

A two-part strategy

The first will be aimed at matching the performance of the general stock market. And to do that, I’ll invest in several low-cost tracker investments.

For example, I’ll buy trackers following London’s FTSE 100 and FTSE 250 indices. And I’ll aim to track small-cap shares in the UK as well. On top of that, I’ll track the American stock market and some emerging markets abroad.

The second pathway will be to invest in individual company stocks. And with that approach, I’ll aim to achieve better returns than those produced by tracking the markets. But, of course, there’s no guarantee I’ll succeed in beating the markets. Shares can go down as well as up and all stocks come with risks as well as positive potential.

Nevertheless, I’d embrace the risks and aim to mitigate them by doing thorough research and investing with care. And although diversification is important too many stocks will likely reduce my portfolio’s potential.

So I’d select a handful from my watchlist, which contains defensive names such as British American TobaccoUnilever and Diageo, among others.

Kevin Godbold owns shares in British American Tobacco. The Motley Fool UK has recommended British American Tobacco, Diageo, and Unilever. 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

Investing Articles

Will the S&P 500 crash in 2026?

The S&P 500 delivered impressive gains in 2025, but valuations are now running high. Are US stocks stretched to breaking…

Read more »

Teenage boy is walking back from the shop with his grandparent. He is carrying the shopping bag and they are linking arms.
Investing Articles

How much do you need in a SIPP to generate a brilliant second income of £2,000 a month?

Harvey Jones crunches the numbers to show how investors can generate a high and rising passive income from a portfolio…

Read more »

Investing Articles

Will Lloyds shares rise 76% again in 2026?

What needs to go right for Lloyds shares to post another 76% rise? Our Foolish author dives into what might…

Read more »

Investing Articles

How much passive income will I get from investing £10,000 in an ISA for 10 years?

Harvey Jones shows how he plans to boost the amount of passive income he gets when he retires, from FTSE…

Read more »

Investing Articles

Down 34% in 2025 — but could this be one of the UK’s top growth stocks for 2026?

With clarity over research funding on the horizon, could Judges Scientific be one of the UK’s best growth stocks to…

Read more »

piggy bank, searching with binoculars
Investing Articles

Can the rampant Barclays share price beat Lloyds in 2026?

Harvey Jones says the Barclays share price was neck and neck with Lloyds over the last year, and checks out…

Read more »

Investing Articles

Here’s how Rolls-Royce shares could hit £25 in 2026

If Rolls-Royce shares continue their recent performance, then £25 might be on the cards for 2026. Let's take a look…

Read more »

Departure & Arrival sign, representing selling and buying in a portfolio
Investing Articles

Prediction: in 2026 the red-hot Rolls-Royce share price could turn £10,000 into…

Harvey Jones can't believe how rapidlly the Rolls-Royce share price has climbed. Now he looks at the FTSE 100 growth…

Read more »