How I’d invest £20k in a Stocks and Shares ISA

If you’re looking to invest £20k in a Stocks and Shares ISA today, this Fool has some tips to help you get started choosing investments.

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 tax year begins on April 6. So, if you’ve not done so already, now is the time to make the most of your Stocks and Shares ISA allowance for the current financial year.

Investors can own any assets inside a Stocks and Shares ISA as long as they are traded on a recognised stock exchange. This essentially means any developed country’s stock market.

As such, there are thousands of investments to choose from.

The best investments for your portfolio will depend on your own personal risk tolerance and investment horizon. However, for most investors, a selection of low-cost passive market tracker funds might be the best option.

Building a Stocks and Shares ISA

If you want to build a Stocks and Shares ISA portfolio at the click of a button, there are some options. Fund management powerhouse Vanguard’s LifeStrategy funds allow investors to build a diversified portfolio at the click of a button.

The LifeStrategy 60% Equity Fund is invested 60% in global equities 40% in global bonds. It charges an annual management fee of 0.22% per annum. Including recent market declines, over the past five years, the fund has turned an investment of £10,000 into £13,000.

That’s not bad for a fund that requires little to no management effort on your part.

If the LifeStrategy offering is not for you, there are plenty of other options. For example, a FTSE All-Share tracker fund will give you exposure to nearly 600 of the largest publicly-traded companies in the UK.

It might be better to own this investment alongside an international index fund inside a Stocks and Shares ISA. An S&P 500 tracker fund is a good alternative. Together these investments would give you exposure to the 1,100 largest public businesses in the UK and US.

Investment trusts are another alternative. Investment trusts are perfect for long term investors, because many of them have already been around for decades, so they know how to act in a crisis.

Today investors can buy investment trusts that own everything from commercial property to physical precious metals and even other funds inside a Stocks and Shares ISA.

If you do choose to go down the investment trust route, it might be sensible to own a portfolio of three or four. This diversification would minimise risk, and hopefully improve your long term returns.

A marathon, not a sprint

Whichever investment route you decide to take, it is essential to keep in mind that investing is a marathon, not a sprint.

Low-cost index funds might not look sexy or produce huge returns overnight. Nevertheless, successful investing is all about protecting and growing your capital over the long run.

High-risk penny stocks might offer the prospect of significant returns in a short time frame. But more often than not, these companies end up wiping out their shareholders.

The best way to protect your hard-earned money is to own a well-diversified portfolio of high-quality businesses. It’s imperative to keep that in mind when you’re picking investments for your Stocks and Shares ISA.

Rupert Hargreaves owns no share 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

ISA coins
Investing Articles

Got a spare £20k for a Stocks and Shares ISA? Here’s how it could generate a £1,400 passive income in 2026!

A Stocks and Shares ISA can be a serious source of long-term passive income. Christopher Ruane explains more about this…

Read more »

Growth Shares

2 of the cheapest FTSE 100 stocks to consider buying as we hit 2026

Jon Smith calls out a couple of FTSE 100 companies that have fallen in the past year that he believes…

Read more »

Tesla building with tesla logo and two teslas in front
Investing Articles

Why Tesla stock outperformed the S&P 500 — again — in 2025

As the Tesla share price shrugs off declining revenues and profits to climb 19%, what kind of further excitement will…

Read more »

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

Thinking of investing in the stock market? Keep these basic rules in mind

Investing in the stock market can put investors on the fast track to building wealth and earning passive income. And…

Read more »

piggy bank, searching with binoculars
US Stock

This Dow Jones stock could be a dark horse outperformer for 2026

Jon Smith looks across the pond and spots a Dow Jones company that has fallen by 11% in the past…

Read more »

Investing Articles

Why Greggs shares crashed 40% in 2025

Greggs has more stores than it had a year ago and total sales are higher, so is a 40% discount…

Read more »

Man hanging in the balance over a log at seaside in Scotland
Investing Articles

4 pros and cons of buying Lloyds shares in 2026!

Investors piled into Lloyds shares last year as the bank delivered strong trading numbers in tough conditions. Could the FTSE…

Read more »

Investing Articles

Prediction: AI stocks will rise again in 2026 and Nvidia’s share price will soar to this level

Can Nvidia and other AI stocks continue to perform in 2026? Edward Sheldon believes so. Here, he explains why he’s…

Read more »