How I’d turn £100 a month into £100k

Rupert Hargreaves explains how you can turn a monthly investment of just £100 into a small fortune with little to no effort.

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.

When investing, your capital is at risk. The value of your investments can go down as well as up and you may get back less than you put in.

Read More

The content of this article is provided for information purposes only and is not intended to be, nor does it constitute, any form of personal advice. Investments in a currency other than sterling are exposed to currency exchange risk. Currency exchange rates are constantly changing, which may affect the value of the investment in sterling terms. You could lose money in sterling even if the stock price rises in the currency of origin. Stocks listed on overseas exchanges may be subject to additional dealing and exchange rate charges, and may have other tax implications, and may not provide the same, or any, regulatory protection as in the UK.

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.

It might seem silly to suggest that you can build a small fortune of £100,000 with a regular monthly investment of just £100, but my figures showed that this really is possible. 

Unfortunately, with interest rates where they are at the moment, it won’t be possible to hit this goal with cash savings. 

So, if you want to make £100,000 with just £100 a month, investing in the stock market is your best option.

Investing might seem like a daunting prospect, but today there are plenty of different tools out there that can help you streamline and simplify your investment process. These include robo advisors, online educational resources, and foundation fund lists provided by the big online brokerages. 

Taking risk 

According to data compiled by analysts at investment bank Credit Suisse, over the past 100 years, UK stocks have produced an average annual return of around 5.5% after inflation. 

While past performance figures should never be used as a guide to future returns, the fact that this number was compiled using 100 years of trading data makes it a good benchmark to use to calculate the potential profits equity investors could achieve going forward. 

My figures show that it would take around 27 years of saving £100 a month to build a £100k savings pot at this rate of return (adjusted to include inflation of 2%). 

However, this returns figure is just an average. Some funds have put up a much better performance than the market over the past 10 to 20 years. Funds with international equity exposure have produced particularly compelling performances.

For example, the Scottish Mortage Investment Trust, which focuses on finding the best growth stocks around the world, has returned around 11% per annum for its investors over the past five years. 

At this rate of return, I estimate it would take 21 years of saving £100 a month to build up a rainy-day fund of £100k. 

A framework 

So, that’s how I would turn £100 a month into £100,000. The figures above are just a rough guide and there’s no guarantee they will be replicated going forward. Nevertheless, I believe the numbers show just how easy it is to accumulate a substantial savings pot – if you are putting away a little every month and investing sensibly

The key here is to make sure that you are saving regularly and putting your money to work either in a tracker fund or actively managed investment trust that has a good track record of generating value for shareholders. Buying single stocks isn’t that sensible with just £100 a month because it will be challenging to build a diversified portfolio without incurring huge costs. 

Instead, investment trusts like Scottish Mortgage or passive funds, like an FTSE All-Share tracker will give you access to an instantly diversified portfolio at the click of a button. No extra effort will be required on your part, and most stockbrokers offer a regular investment plan, which costs only a few pounds every month. It’s worth subscribing to this if you’re serious about getting wealthy. 

Should you invest, the value of your investment may rise or fall and your capital is at risk. Before investing, your individual circumstances should be assessed. Consider taking independent financial advice.

Rupert Hargreaves owns no share 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

Growth Shares

This major UK bank just updated the forecast for the Rolls-Royce share price

Jon Smith talks through an analyst forecast for the Rolls-Royce share price and explains why he thinks further gains could…

Read more »

Middle-aged white male courier delivering boxes to young black lady
Investing Articles

This FTSE 100 share looks like a Black Friday bargain for me!

Our writer explains why he recently took the opportunity to buy this ultra-cheap FTSE 100 share after its 39% year-to-date…

Read more »

Investing Articles

What will happen to the stock market in 2025? Here’s what the experts say

The UK stock market did well at the start of this year but has faltered towards the end. Our writer…

Read more »

Investing Articles

After plunging nearly 40%, I’m considering buying this bargain FTSE 100 stock

Paul Summers has been running the rule over one of the year's biggest FTSE 100 losers. Is a screamingly cheap…

Read more »

Ice cube tray filled with ice cubes and three loose ice cubes against dark wood.
Investing Articles

Just released: this month’s lower-risk, higher-yield Share Advisor recommendation [PREMIUM PICKS]

Ice ideas will usually offer a steadier flow of income and is likely to be a slower-moving but more stable…

Read more »

Investing Articles

Should I buy growth or value in my Stocks and Shares ISA?

Here’s why Stephen Wright's looking past the difference between growth stocks and value shares when finding investments for his ISA.

Read more »

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

If I’d invested £5,000 in a Nasdaq index fund 5 years ago, here’s how much I’d have now

The Nasdaq index keeps hitting new all-time records in 2024, as US tech stocks fly. How much could I have…

Read more »

A senior group of friends enjoying rowing on the River Derwent
Investing Articles

£500 to invest a month? Consider aiming to turn that into a £20,000 passive income like this!

With a regular monthly investment, it's possible to build a large and steady passive income for retirement. Royston Wild explains.

Read more »