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

How much do I need to invest to become a Stocks & Shares ISA millionaire?

We can dream of becoming a stock market millionaire. With these tips, a steady investment in a Stocks and Shares ISA might make this possible.

| 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.

Playful senior couple in aprons dancing and smiling while preparing healthy dinner at home

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.

Last year, there were 4,000 Stocks and Shares ISA millionaires in the UK. And the number’s expected to keep growing as people get financially savvier and look for better returns than those from traditional savings accounts.

But how much does a investor need to invest to build a magic million-pound portfolio?

The magic number

The answer to this isn’t a simple one. It depends on a variety of factors, including the rate of return I’m seeking. A higher return of, say, 12% will mean I don’t have to invest as much. But targeting a larger return also means I’ll typically be taking a bigger risk with my cash.

But in order to get an idea, let’s use the average return that Stocks and Shares ISA investors have enjoyed over the past decade. This stands at 9.64%, according to financial services provider Moneyfarm.

If I was looking to reach millionaire status after 30 years of investing, I’d need to invest exactly £478 each month based on this figure. A breakdown of total deposits and earned interest over the period can be seen below.

Returns after 30 years.
Created with thecalculatorsite.com

Tax boost

Past performance is no guarantee of future returns, of course. I may find myself making a sub-9.64% return over the long term. With a bit of luck, I may even beat that figure.

But I’m boosting my chances of hitting that million-pound target straight away by using a Stocks and Shares ISA. This way I don’t have to pay the taxman a penny on any capital gains or dividends I receive.

Over time, this can add up to a significant chunk of cash. Asset manager Netwealth reckons an additional rate taxpayer investing £100,000 in an ISA would save £44,000 in taxes over a decade. That’s based on a 5.9% average annual return, and excludes broker fees.

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.

Two top tips…

There are other important things I can do to try and reach millionaire status. One is to reinvest any dividends I receive, allowing me to earn money on this ‘interest’ alongside my initial capital.

As I buy more and more shares, which in turn gives me an increasing number of dividends, a snowball effect’s created that can supercharge the size of my portfolio over time. This mathematical miracle is known as compounding.

The other thing I’d do is invest in a wide range of shares, exchange-traded funds (ETFs), and other assets. Spreading my money across asset classes, sectors, and geographies gives me exposure to different investment opportunities and also spreads risk.

… and one great ETF

A fund like the iShares Edge MSCI USA Quality Factor UCITS ETF (LSE:IUQA) could help me achieve this in an easy and cost-effective way. This particular product invests in 125 US companies that have great records of generating strong and stable earnings.

Major names it holds include microchip manufacturer Nvidia, pharmaceuticals giant Eli Lilly, retailer Costco and credit card provider Visa.

Its narrow focus on US shares could create problems if sentiment towards the Stateside stock market deteriorates. But, on balance, I think it’s still worth a close look.

This quality factor fund’s delivered an average annual return of 14.39% since its inception in 2016. If this continues, a £478 monthly investment here could help me hit millionaire status much sooner.

Royston Wild has no position in any of the shares mentioned. The Motley Fool UK has recommended Nvidia and Visa. 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

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 »

Night Takeoff Of The American Space Shuttle
Investing Articles

A SpaceX IPO could light a fire under this FTSE 100 stock

Shareholders of this FTSE 100 investment trust may have just got an early Christmas present from Space Exploration Technologies (SpaceX).

Read more »