How you can become an ISA millionaire in 20 years

The UK already has about 1,000 ISA millionaires, and here’s how you could join them.

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.

With this year’s ISA deadline coming up in April and a whole new investing allowance of £20,000 coming our way for the 2018-19 tax year, how much do you think you might accumulate? Do you think a million pounds is out of the question?

You might be surprised to learn that there are estimated to be close to 1,000 investors in the UK who have accumulated a million or more in their ISA accounts, most of whom started out investing in the earlier PEP (Personal Equity Plan) scheme. 

The PEP was introduced in the 1986 budget, so investors have had a maximum of 32 years to reach the million milestone. But seeing as some are even multimillionaires now, getting there in 20 years is feasible, especially as a couple can invest up to £40,000 per year. Who are these super investors and how did they get where they are?

The millionaires

One, Balbir Bagria, managed to retired at the age of 39 and he and his wife stopped adding new cash to their ISAs in the year 2000, achieving multimillionaire status in less than 15 years. Mr Bagria’s investment performance has been nothing less than stellar, as he achieved an annualised return of around 25% via a carefully chosen portfolio of around 10 to 15 stocks — that’s way better than even Warren Buffett has managed over the same period.

But you don’t need to beat Warren Buffett to do it. John (now Lord) Lee became the UK’s first known ISA millionaire back in 2003, just 17 years after PEPs were introduced — and his ISA now holds several million pounds in shares. Interestingly, Lord Lee also went for a limited portfolio of around 10 stocks, but does he have any other secrets?

Never taking any anything out and always investing dividend cash in new shares is a key part of his strategy. He also aims to hold a share for at least five years, avoids big gambles, and only invests in consistently profitable companies whose businesses he understands.

Which shares do ISA millionaires typically choose?

Online broker Hargreaves Lansdown reckons it has more than 150 millionaires among its ISA investors, and you might be surprised to learn that they haven’t relied on hitting ‘get rich quick’ startups or fashionable growth stocks.

No, the top 10 stocks held by the firm’s ISA millionaires are Aviva, BP, GlaxoSmithKline, Legal & General, Lloyds Banking Group, National Grid, Rio Tinto, Royal Dutch Shell, Unilever and Vodafone — all FTSE 100 giants, and all big Foolish favourites.

Returns

If you’re starting today, what would you realistically need to achieve to make a million in 20 years? Let’s assume the current £20,000 limit will continue — hopefully it will rise with inflation, but we’ll stick to 2018 prices.

If you can use up your entire ISA allowance of £20,000 each year for the next 20 years, spread out in monthly instalments of £1,667, you’d need to achieve a return of 8.4% per year to reach the magic million mark. Is that really possible? As it happens, that’s actually slightly less than the average total return of the FTSE All Share index over the past 30 years, so the answer is a clear yes.

Most people don’t have that amount of cash spare to invest every month, but if you invest the most you can manage and leave it there for the long term, you could end up a very happy retiree.

Alan Oscroft owns shares of Aviva and Lloyds Banking Group. The Motley Fool UK owns shares of and has recommended GlaxoSmithKline and Unilever. The Motley Fool UK has recommended BP, Hargreaves Lansdown, Lloyds Banking Group, and Royal Dutch Shell. 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

Warren Buffett at a Berkshire Hathaway AGM
Investing Articles

Can someone invest like Warren Buffett with a spare £500?

Christopher Ruane explains why an investor without the resources of billionaire Warren Buffett could still learn from his stock market…

Read more »

Investing Articles

Can these 2 incredible FTSE 250 dividend stocks fly even higher in 2026?

Mark Hartley examines the potential in two FTSE 250 shares that have had an excellent year and considers what 2026…

Read more »

Thoughtful man using his phone while riding on a train and looking through the window
Investing Articles

Is 45 too late to start investing?

Investing at different life stages can come with its own challenges -- and rewards. Our writer considers why a 45-year-old…

Read more »

Hand of person putting wood cube block with word VALUE on wooden table
Investing Articles

UK shares look cheap — but the market might be about to take notice

UK shares have traded at a persistent discount to their US counterparts. This can create huge opportunities, but investors need…

Read more »

Investing Articles

This FTSE 100 growth machine is showing positive signs for a 2026 recovery

FTSE 100 distributor Bunzl is already the second-largest holding in Stephen Wright’s Stocks and Shares ISA. What should his next…

Read more »

Investing Articles

I asked ChatGPT for the best FTSE 100 stocks to buy for passive income in 2026 and it said…

Paul Summers wanted to learn which dividend stocks an AI bot thinks might be worth buying for 2026. Its response…

Read more »

ISA Individual Savings Account
Investing Articles

Stop missing out! A Stocks and Shares ISA could help you retire early

Investors who don't use a Stocks and Shares ISA get all the risks that come with investing but with less…

Read more »

Investing Articles

Will Greggs shares crash again in 2026?

After a horrible 2025, Paul Summers takes a look at whether Greggs shares could sink even further in price next…

Read more »