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.

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.

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. 

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

Close-up of a woman holding modern polymer ten, twenty and fifty pound notes.
Investing Articles

£20,000 in savings? Here’s how someone could aim to turn that into a £10,958 annual second income!

Earning a second income doesn't necessarily mean doing more work. Christopher Ruane highlights one long-term approach based on owning dividend…

Read more »

Road 2025 to 2032 new year direction concept
Investing Articles

My favourite FTSE value stock falls another 6% on today’s results – should I buy more?

Harvey Jones highlights a FTSE 100 value stock that he used to consider boring, but has been surprisingly volatile lately.…

Read more »

UK supporters with flag
Investing Articles

See what £10,000 invested in the FTSE 100 at the start of 2025 is worth today…

Harvey Jones is thrilled by the stunning performance of the FTSE 100, but says he's having a lot more fun…

Read more »

Investing Articles

Prediction: here’s where the latest forecasts show the Vodafone share price going next

With the Vodafone turnaround strategy progressing, strong cash flow forecasts could be the key share price driver for the next…

Read more »

Front view of a young couple walking down terraced Street in Whitley Bay in the north-east of England they are heading into the town centre and deciding which shops to go to they are also holding hands and carrying bags over their shoulders.
Investing Articles

How much do you need in a SIPP or ISA to aim for a £2,500 monthly pension income?

Harvey Jones says many investors overlook the value of a SIPP in building a second income for later life, and…

Read more »

Friends at the bay near the village of Diabaig on the side of Loch Torridon in Wester Ross, Scotland. They are taking a break from their bike ride to relax and chat. They are laughing together.
Investing Articles

Can you turn your Stocks and Shares ISA into a lean, mean passive income machine?

Harvey Jones shows investors how they can use their Stocks and Shares ISA to generate high, rising and reliable dividends…

Read more »

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

Move over Lloyds, are Barclays shares the ones to go for in 2026?

As we head into 2026 with inflation and interest rates set to fall, what does the banking outlook offer for…

Read more »

Young Black man sat in front of laptop while wearing headphones
Investing Articles

Down 60% with a 10.2% yield and P/E of 13.5! Is this FTSE 250 stock a once-in-a-decade bargain? 

Harvey Jones is dazzled by the yield available from this FTSE 250 company, and wonders if it's the kind of…

Read more »