We have some exciting news to share! The Motley Fool UK has now become The Twelfth Magpie -- an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. This site is our new home, and there will be extra tweaks made across the coming few days as we settle in. So if anything looks a little off, please bear with us!

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.

How I’d invest £10k in an ISA to make a million by retirement

Rupert Hargreaves explains the strategy he’s following to make a million for retirement by using the stock market and an ISA.

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.

Many investors dream of being able to retire with £1m in the bank. The good news is my figures suggest this is possible with a stringent savings and investment plan. Today, I’m going to explain my strategy to make a million using an ISA for retirement

Make a million 

At the core of my millionaire-maker strategy is the stock market. Over the past few decades, the stock market has produced an average annual return for investors in the region of 8%. I see no reason why the market cannot repeat this performance in the decades ahead. That tells me stocks could be one of the best assets to own to build wealth in the long term. 

XXX

In my opinion, owning stocks in an ISA is one of the best ways to hold this asset class. You can only contribute £20,000 a year to an ISA, but its tax benefits more than make up for these limitations. Any income or capital gains earned on assets held inside one of these wrappers doesn’t attract tax. You don’t even need to declare the income on your tax return.

Following the recent increase in the dividend tax rate to 7.5% on any dividends over £2k a year for basic-rate taxpayers, these tax benefits could potentially be worth tens of thousands of pounds in the long run. This is why I think an ISA is a perfect tool to make a million. 

ISA investing 

To replicate the performance of the stock market over the past few decades, I’d buy a low-cost passive tracker fund. After the initial investment, I’d set up a monthly investment plan to make the most of the wealth-creating power of the stock market in the long run.

According to my calculations, £10,000 invested in the stock market at an average annual return rate of 8% could grow to be worth £220,000 after four decades.

However, with the addition of an extra £100 a month, the final total could hit £541,000. An additional £200 a month would provide an absolute value of £870,000, according to my calculations. And an extra £300 a month could potentially yield a final investment value of £1.1m. 

Straightforward process 

I think these figures show just how straightforward it can be to make a million in an ISA. Even at the higher target of £300 a month, the total outlay is only £3,600 a year. That’s easily under the annual ISA cap of £20k. 

The £1m nest egg would easily provide enough cash to retire on in comfort. The market’s current dividend yield sits at around 4%. This level of income on a financial nest egg of over £1m could provide an annual income in retirement of more than £40,000 a year. 

That’s the strategy I’d use to make a million by retirement. Indeed, I already have a regular investment and savings plan in place. All I have to do is make sure the money is available each month, and the market takes care of the rest.

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

Friends and sisters exploring the outdoors together in Cornwall. They are standing with their arms around each other at the coast.
Investing Articles

£503 buys 14 shares in this FTSE 250 stock that returned 23.9% annually for the last 15 years

This FTSE 250 stock has averaged a huge return for 15 years. At today's price, £503 buys 14 shares. But…

Read more »

Black woman using loudspeaker to be heard
Investing Articles

£1,000 buys 25 shares in this FTSE 100 stock that’s returned 29.2% annually for the last 10 years

This FTSE 100 mining stock has returned close to 30% a year for a decade. At 3,995p, £1,000 buys 25…

Read more »

Female student sitting at the steps and using laptop
Investing Articles

Down 47%, is this growth stock finally worth buying in May?

With a £288m order book and a hidden pipeline of defence and nuclear contracts, is this growth stock now too…

Read more »

House models and one with REIT - standing for real estate investment trust - written on it.
Investing Articles

2 REITs yielding 7%+ to consider for passive income in 2026

A REIT backed by the NHS and another backed by Tesco and Sainsbury's with both yielding 7%+. Here's why I'm…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

Just 97 shares of this UK dividend stock generate £238 in passive income

A 5.7% yield, £238 in passive income from just 97 shares, and one of the most divisive dividend stocks on…

Read more »

ISA coins
Investing Articles

£10,000 in an ISA generates a second income of…

The London Stock Exchange is home to some of the world's most generous dividends. But how big a second income…

Read more »

Shot of a senior man drinking coffee and looking thoughtfully out of a window
Investing Articles

Expert recommendations: 2 top income stocks yielding 7%+!

With yields of 7.2% and 7.8% respectively, these two income stocks are catching the eyes of institutional analysts. Should investors…

Read more »

Illustration of flames over a black background
Investing Articles

3 top income-focused stocks to buy in May 2026, according to experts

Looking for a stock to buy for income in May 2026? Experts have flagged these three UK dividend shares as…

Read more »