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

A million from your ISA investments won’t come easy, but with a bit of dedication it’s surely achievable.

You’re reading a free article with opinions that may differ from The Twelfth Magpie’s Premium Investing Services. Become a member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn more, and get a free 'Best Buy Now' stock!.

At the Motley Fool, we’re always talking about the sums you can accumulate by investing in shares for the long term.

But a million? Well, there are an estimated 1,000 ISA millionaires in the UK, so it’s very much an achievable target. But it is likely to take a fair amount of hard work and dedication to get there, though if you’re the kind of person who’s prepared to make the extra effort, I say you can do it.

Should you buy Rolls Royce shares today?

Before you decide, please take a moment to review this report first. Despite ongoing uncertainties from US tariffs to global conflicts, Mark Rogers and his team believe many UK shares still trade at substantial discounts, offering savvy investors plenty of potential opportunities to learn about.

That’s why this could be an ideal time to secure this valuable research – Mark’s analysts have scoured the markets to reveal 5 of his favourite long-term ‘Buys’. Please, don’t make any big decisions before seeing them.

Lump sum

Why £10,000? You certainly don’t need a lump sum to get you started in investment, and even just stashing away a few pounds per day can make a difference. But if you do have a chunk of cash to get you going, you can start seeing meaningful results that much sooner.

Several people I know started investing when they received a windfall, and £10k is the kind of sum that people quite often receive. I had £10k once from an employer’s share option scheme, and a similar amount selling a flat (and moving somewhere cheaper), and there must be many on higher incomes whose annual bonuses are around that level or even more.

And the ultimate lump sum to invest for retirement is, perhaps, the cash you might liberate from a company pension scheme and transfer to a SIPP, and that could be a lot more than £10,000.

Performance

According to Barclays, the UK stock market has been returning 4.9% above inflation for a century or more, and I can’t see that stopping any time soon. In fact, I think we could be in for a few years of better returns, and I’ll come to that shortly.

If inflation sticks at around 2%, which is close to the Bank of England’s long-term target, the Barclays figure would suggest a return of 6.9% per year. With all returns reinvested, that would turn an initial £10,000 into a million in, well, 70 years. Now, I know I’m talking about the long term, but I doubt many people reading this will be thinking of working and investing for quite that long.

The latest figures from AJ Bell suggest to me that we’re in a spell when a lump sum investment could do significantly better than that, because FTSE 100 dividends are unusually high these days. Of the whole index, 26 stocks are on forecast dividend yields of 6% or better, with an average among them of 7.8%.

Top yields

If you invest now, you can lock in those yields, and a £10,000 investment pot is plenty to get a good spread across the 26 companies. It’s only approximately £385 per stock if you go for all of them, but you can be a bit selective and, say, choose one from BP (6.2%) and Shell (6.4%), one from Aviva (7.1%), Legal & General (6.3%) and Standard Life Aberdeen (7%), one from Taylor Wimpey (10.6%), Persimmon (9.5%) and Barratt (7.2%), and so on.

If you assume share price gains in line with inflation of around 2%, a total return of 9.8% would turn your £10k into £1m in 50 years. That’s still a long time, but you could bring it down a lot by adding regular monthly savings. Just £200 per month on top would get you to a million in 36 years, and if you invest £500 per month you could get there in 29 years.

And in an ISA, it’s all tax-free.

Alan Oscroft owns shares of Aviva and Persimmon. The Motley Fool UK has recommended Barclays. 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 Retirement Articles

Senior Adult Black Female Tourist Admiring London
Investing Articles

Just 9% of us can expect a ‘comfortable’ retirement! Could UK shares be the answer?

Millions of Brits could miss out on the retirement of their dreams. Might they avoid this by investing in UK…

Read more »

happy senior couple using a laptop in their living room to look at their financial budgets
Investing Articles

Here’s why Legal & General is still one of the UK’s most popular SIPP buys

So far in 2026, UK SIPP investors have largely stuck to the same group of favourite FTSE 100 stocks. And…

Read more »

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.
Investing Articles

Want to retire early? Here’s how a weak stock market could actually help

Christopher Ruane demonstrates with a real-world example how a tumbling stock market could potentially help someone who wants to retire…

Read more »

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.
Investing Articles

12.2m reasons why I’m building a passive income to supplement the State Pension!

Saving for retirement might be more urgent than you think! Here's why I'm investing in ISAs and SIPPs to supplement…

Read more »

Smiling white woman holding iPhone with Airpods in ear
Investing Articles

What’s the right age to think seriously about a SIPP?

If you reckon a SIPP's something you can put off thinking about until you're older, you may be missing out…

Read more »

Young mixed-race couple sat on the beach looking out over the sea
Investing Articles

How much does someone need to put in the stock market to stop working and live off passive income?

Dividends as a passive income stream? Christopher Ruane looks at how the stock market could potentially help someone as they…

Read more »

A close up side view of a father and his young daughter who is a wheelchair user having a cute affectionate moment with each other whilst on a family day out in a beautiful public park in Newcastle upon Tyne in the North East of England.
Investing Articles

How much do you need in an ISA for £20 a day of passive income in retirement?

Mark Hartley simplifies the stress and complexities around building passive income in retirement, focusing rather on a basic, daily amount.

Read more »

Young mixed-race woman jumping for joy in a park with confetti falling around her
Investing Articles

Does a SIPP really offer free money? What about an ISA?

When people talk about a SIPP giving them free money, what exactly are they talking about? Our writer explains some…

Read more »