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

This Fool gives his advice on where he would invest £20k today.

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.

ISAs are an excellent tool for long-term saving. At the time of writing, savers can put away £20,000 a year in a stocks and shares ISA, and invest this money how they wish.

There’s no income tax or capital gains tax applicable on any income or profits generated on the money inside an ISA wrapper. You don’t even need to declare it on your tax return.

Every single investor can benefit from opening an ISA. And if you’re planning to do just that, but don’t know where to invest your £20,000 savings pot, I think there are a couple of rules you should follow.

Slow and steady wins the race

Firstly, even though profits and losses inside an ISA are not subject to capital gains tax, I think it’s sensible to concentrate on buying investments for the long term, rather than trying to pick short-term bets. Yes, you might make more money by trying to trade the market, but as the ISA contribution is limited to just £20,000 every year, you cannot replace any money if you end up making a losing trade.

The best way to maximise your ISA allowance is, in my opinion, to focus on attractive long-term buy-and-forget investments.

With this being the case, I think it’s probably best to concentrate on picking blue-chip dividend stocks, or if you aren’t comfortable chosing single stocks, buying an FTSE 100 tracker fund might be a better option. Other options are available, including investment trusts, which cost a bit more, but offer a higher level of income.

Personal preference

The amount of money you devote to blue-chip stocks will depend on your own investing preference. I believe it could be best to devote the bulk of your £20k investment to these companies.

At the same time, it could be a good idea to target high growth stocks as well, although I don’t recommend trying to pick these stocks yourself. It’s better to choose a fund run by an experienced small-cap investor. Doing so will give you exposure to small-cap companies, which generally produce a better return than blue-chips over the long term, without exposing yourself to the risk of permanent capital impairment.

If you’re happy to have your entire ISA invested in stocks, I recommend investing around 75% in blue-chip stocks and 25% in small- and mid-cap companies (via funds).

If you’re not too comfortable with such a high allocation towards equities, bond funds can be added to the mix as well. Replacing the 25% allocation towards small- and mid-cap companies with bonds would impact long-term returns, but it would also reduce volatility.

The income option 

At the moment, blue-chip stocks offer a higher level of income than most bonds. So, if it’s income you’re after, it might be better to have more money in blue-chips than bonds. Although, at the end of the day, the allocation you decide on really depends on how comfortable you are owning certain investments.

Personally, I’ve adopted the 75% blue-chip and 25% small- and mid-cap allocation. I’m satisfied with this level of risk and believe it will produce the best returns over the long term.

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

Young mixed-race couple sat on the beach looking out over the sea
Investing Articles

This FTSE small-cap stock can surge 105%, says one broker

Ben McPoland highlights a FTSE small-cap share that's trading cheaply and offering a dividend for the first time since 2019.

Read more »

A mature adult sitting by a fireplace in a living room at home. She is wearing a yellow cardigan and spectacles.
Investing Articles

£10,000 invested in ultra-high yield Legal & General shares on 5 April last year is now worth…

Investors typically buy Legal & General shares for the dividend income, as they now yield more than 8.5%. But will…

Read more »

Modern apartments on both side of river Irwell passing through Manchester city centre, UK.
Investing Articles

With an empty ISA today, how long would it take to aim for a million?

Is it realistic to aim for a million with an empty ISA? Our writer turns from fantasy to facts to…

Read more »

Burst your bubble thumbtack and balloon background
Investing Articles

What on earth’s going on with the Helium One share price?

The Helium One share price rally has stalled. Our writer reflects on the reasons and asks whether now could be…

Read more »

Female student sitting at the steps and using laptop
Investing Articles

Getting started with investing? Here are 3 UK stocks to take a look at

The next time the stock market opens, it will be the new financial year. And Stephen Wright has three UK…

Read more »

Diverse children studying outdoors
Growth Shares

2 growth shares beating Rolls-Royce stock so far this year

Jon Smith points out some growth shares that have come out of the blocks strongly in 2026, with momentum right…

Read more »

Calendar showing the date of 5th April on desk in a house
Investing Articles

How much would someone need in an ISA to double the state pension and target a £24,436 annual income?

A full state pension is £230.25 per week. But James Beard reckons it’s possible to aim to double this by…

Read more »

Smartly dressed middle-aged black gentleman working at his desk
Investing Articles

New to investing? Here’s how to use the stock market to try and generate a second income

Is investing in the stock market a better way of earning a second income than starting a business? Stephen Wright…

Read more »