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 £5 per day in an ISA to make £500k

Investing small amounts regularly can lead to big gains. Roland Head explains how he’d invest £150 each month to build a £500k 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.

Saving £500,000 might feel like it’s out of reach for many of us. But I reckon I should be able to hit this target by saving as little as £5 per day, or £150 per month. In this piece I want to explain how I’d invest my cash in the stock market to build a £500k retirement fund.

How I plan to multiply my money

Although I want to build a £500k fund, I don’t intend to save £500,000 of my hard-earned cash. In fact, I only expect to have to contribute around £72,000 of my own cash to hit my goals.

XXX

The reason this is possible is because of the power of compounding. What this means is leaving any capital gains or dividend income untouched in my account and reinvesting it every year. Over time, following this approach makes a big difference to investment returns.

For example, the average long-term return from the UK stock market is about 8% per year. If I invested £1,000 at this rate and made no withdrawals, my investment would be worth £10,062 after 30 years. That’s a profit of £9,062.

However, if I withdrew the 8% return each year, my total profit would be just £2,400.

Staying with the same 8% return, my calculations show that by investing £5 per day (£150 per month) for 40 years, I should be able to build a £500,000 retirement fund.

How I’d invest the cash

There are lots of ways to invest in the stock market, but my priority is to make it simple, cheap, and reliable.

In my view, the cheapest and simplest way to invest in UK shares is to buy a FTSE 100 index fund. These low-cost funds track the progress of the FTSE 100 index, which contains the 100 largest companies on the UK stock market.

A FTSE 100 tracker fund won’t fill my life with excitement. But over long periods, history suggests that it should be reliable.

However, I can’t ignore the fact that smaller companies have earned more attractive returns over the last decade. To gain some exposure to faster-growing businesses, I’d probably put half of my cash into a FTSE 250 index fund. The FTSE 250 contains companies that are well established but a little smaller than FTSE 100 firms. Typically, FTSE 250 companies have more room left to grow.

Why I always use an ISA

I don’t mind paying tax. But the UK ISA system means that investors can invest up to £20,000 a year completely tax free. This is a no-brainer, in my view.

That’s why the first thing I did when I started investing was to open a Stocks and Shares ISA.

The £20,000 per year limit on an ISA means you can save up to £1,666 per month, tax free. That’s plenty, for most people. Indeed, my sums show that based on the 8% annual return I mentioned above, you could hit £1m in 20 years if you maxed out your ISA each month.  

Roland Head 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 »