Share your opinion and earn yourself a free Motley Fool premium report!

We are looking for Fools to join a 75 minute online independent market research forum on 15th / 16th December.

To find out more and express your interest please click here

40 and no pension? Here’s what £400 a month in a Stocks and Shares ISA could become

It’s never too late to start investing for retirement. Here’s how regular contributions to a Stocks and Shares ISA could balloon over time.

| 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.

ISA Individual Savings Account

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.

A Stocks and Shares ISA is a popular option for UK investors looking to build extra income for retirement. The tax-free allowance means investors can sink up to £20k per year into the account with no tax on the capital gains.

That’s probably a bit more than most people can afford to squirrel away each year. But no worries, even £400 a month can quickly add up to a lot due to the miracle of compounding returns.

Here’s one strategy a late but highly motivated investor could use to aim for a comfortable retirement.

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.

Diversified risk

A self-directed ISA brings with it a certain level of responsibility regarding risk. Unlike a Cash ISA, the investor needs to navigate their own path to ensure positive growth.

However, the potential for higher returns is much greater. The key is to balance risk and reward. One way to do this is through a diversified mix of stocks, funds, and investment trusts.  

Take Scottish Mortgage Investment Trust (LSE: SMT), for example. This highly diversified trust provides exposure to almost 100 stocks from a range of different countries.

Its core focus is on leading tech giants such as Nvidia, Meta, and TSMC. However, it’s also enthusiastic about global e-commerce, opting not only for popular choices like Amazon and Shopify but also smaller outfits like Sea Limited, DoorDash, and even private equity like Rappi.

Being heavily weighted towards US tech stocks is a moderate risk and one that’s resulted in volatility before. Since suffering a sharp drop in 2022, the fund has been trading at a discount to its net asset value (NAV). That means investors get exposure to all listed stocks at a price cheaper than buying them individually.

In February 1995, the shares were changing hands at a meagre 42p a pop. Fast-forward 30 years and they’re now valued at 1,087p. That equates to an annualised growth of 11.45%.

That’s somewhat higher than average for UK stocks. However, it’s realistic to aim for annual growth of 10% with a decent portfolio of stocks. After all, the FTSE 100 returned 9.5% last year.

Retirement goals

By investing £400 a month into an ISA with an average return of 10%, the pot could grow to over £535,000 in 25 years. That’s from only £120,000 invested (£400 x 12 x 25). At that point, the investor could begin drawing down approximately £53,500 a year — a sizeable pension pot to live off!

Even if performance tapered off to a below-average return of only 5%, it could still grow to nearly £240,000. In a strong portfolio of dividend stocks with an average 7% yield, that would return £16,800 a year.

Most likely, the final amount would fall somewhere in between these two extremes. In a standard rate Cash ISA, the pot would barely grow to above £200,000.

The above example shows how a lack of pension at 40 is not a life sentence. It’s never too late to start working towards a comfortable future. However, it will require a dedicated savings plan and a large monthly contribution.

John Mackey, former CEO of Whole Foods Market, an Amazon subsidiary, is a member of The Motley Fool’s board of directors. Randi Zuckerberg, a former director of market development and spokeswoman for Facebook and sister to Meta Platforms CEO Mark Zuckerberg, is a member of The Motley Fool's board of directors. Mark Hartley has positions in Scottish Mortgage Investment Trust Plc. The Motley Fool UK has recommended Amazon, Meta Platforms, Nvidia, Sea Limited, Shopify, 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

Investing Articles

Up 30% in 2025 and still cheap! Is this former stock market darling the best share to buy today?

Harvey Jones has been hunting for the best shares to buy for his SIPP, and found what he thinks is…

Read more »

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

£5,000 to invest? Consider 5 no-brainer dividend shares with over 20 years of growth

These UK dividend shares have some of the longest track records of consistent growth, making them a dream for passive…

Read more »

Passive income text with pin graph chart on business table
Investing Articles

How to build passive income starting with just £3 a day

Starting with only £3 a day, it's possible to build a pot worth £200,000 over decades. But which investments does…

Read more »

Investing Articles

£5,000 invested in Tesco shares at the start of 2025 is now worth…

Tesco shares have enjoyed a very strong run over the past couple of years. But where next for this FTSE…

Read more »

Night Takeoff Of The American Space Shuttle
Investing Articles

4 dirt-cheap growth shares to consider for 2026!

Discover four top growth shares that could take off in the New Year -- and why our writer Royston Wild…

Read more »

Road 2025 to 2032 new year direction concept
Investing Articles

I asked ChatGPT how to start investing in UK shares with just £500 and it said do this

Harvey Jones asks artificial intelligence a few questions about how to get started in investing, before giving up and deciding…

Read more »

Three signposts pointing in different directions, with 'Buy' 'Sell' and 'Hold' on
Dividend Shares

Yielding 10.41%, is this the best dividend share in the FTSE 250?

Jon Smith points out a dividend share with a double-digit yield, but explains why digging below the surface provides important…

Read more »

Investing Articles

Is 2026 the year it all goes wrong for the Rolls-Royce share price?

2025 has been another stellar year for the Rolls-Royce share price but Harvey Jones wonders just how long its magnificent…

Read more »