My simple 3-step plan to build up a £1m ISA account

A £1m ISA could be in reach, but investors need a clear strategy, says Rupert Hargreaves.

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.

According to the Financial Times, there are just under 500 so-called ‘ISA Millionaires’ in the UK. The one thing that links all of these investors is age. The average age of the UK ISA millionaire is around 70. This suggests these investors have been squirrelling money away for decades, and patiently waiting for a return.

The other factor that links all of these millionaires is their love of investing. All of them have used the stock market to help them build wealth. Strategies differ from account to account (based on the limited information available), but the one thing they all have in common is a focus on long-term investing in high-quality companies.

Based on the above information, I’ve put together a three-step plan to build a £1m ISA account.

ISA saving 

The first step is to start saving. Investors are currently allowed to put away £20,000 a year in a stocks and shares ISA. This is a use-it-or-lose-it allowance. So, it makes sense to use as much of the quota as possible every year — even if you can only afford a couple of hundred pounds.

It’s not possible to build a £1m ISA overnight. It takes time. In fact, with contributions of £20k a year, it would take five decades, excluding any investment gains or losses. That’s why it’s essential to start saving as soon as possible. When you’ve started, you need to stick to the savings plan over the long term.

Trust the market

The next step is to invest your money. Over the long run, the FTSE 250 has returned around 10% per annum. At this rate of return, it would take just 18 years to build a £1m ISA account. That’s assuming an investor used up the full £20,000 ISA allowance every year.

It would be impossible to achieve the same kind of return with cash interest rates where they are today. The best flexible Cash ISA interest rate on the market today is just 1.3%. At this rate of return, it would take nearly four decades to build a £1m ISA account with annual top-ups of £20k.

Quality over quantity

The third and final step is to seek quality over quantity. One thing that links all successful long-term investors is a focus on high-quality stocks. This primarily means targeting companies that have a definite competitive advantage and a loyal customer base.

These are the kind of businesses investors can buy and forget, safe in the knowledge that they should generate attractive returns over the long run.

Successful long-term investors also avoid trading in and out of positions quickly. They tend to pick a few key companies and stick with them, rather than owning a broad range of businesses. The more investments you make, the higher the chances are that something will go wrong.

Buying a low-cost FTSE 250 or FTSE 100 tracker fund could be an excellent alternative for investors who don’t have enough time to find these sort of companies.

Rupert Hargreaves has no position in any of the shares 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

Close-up image depicting a woman in her 70s taking British bank notes from her colourful leather wallet.
Investing Articles

3 FTSE 100 dividend stocks with the biggest yields. Time to buy?

The insurance sector's filled with dividend stocks paying enormous yields. Is this a massive buying opportunity? Or are these payouts…

Read more »

Artillery rocket system aimed to the sky and soldiers at sunset.
Investing Articles

Will we see a catastrophic stock market crash next week?

Harvey Jones examines how investors should respond to the current uncertainty, and urges investors to stay calm even if the…

Read more »

Two business people sitting at cafe working on new project using laptop. Young businesswoman taking notes and businessman working on laptop computer.
Investing Articles

Down 15% in a month! The Barclays share price looks like a screaming buy for me

Harvey Jones has had his eyes on the Barclays share price for ages. As markets plunge, this may be his…

Read more »

Concept of two young professional men looking at a screen in a technological data centre
Investing Articles

Here’s why I’m betting big on these 2 FTSE 100 stocks in the age of AI

This pair of FTSE 100 stocks couldn't be more different. So why are they big positions in my Stocks and…

Read more »

UK financial background: share prices and stock graph overlaid on an image of the Union Jack
Investing Articles

Is last week’s dip in the Rolls-Royce share price a brilliant buying opportunity?

Even the Rolls-Royce share price can't shake off current stock market turmoil, but Harvey Jones says the FTSE 100 stock…

Read more »

Senior Adult Black Female Tourist Admiring London
Investing Articles

Does the Lloyds share price suddenly look like a bargain again?

After a brilliant run the Lloyds share price was starting to look a little overstretched, says Harvey Jones. But does…

Read more »

British pound data
Investing Articles

It’s time to prepare for a stock market crash

Edward Sheldon expects the stock market to keep rising in 2026. However, looking further out, he sees the potential for…

Read more »

DIVIDEND YIELD text written on a notebook with chart
Investing Articles

£5,000 buys 1,938 shares in this 8.4%-yielding passive income stock!

An investment of £5,000 in this amazing passive income stock could generate £422 in dividends this year. And things could…

Read more »