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 £100 per month in an ISA starting today

Rupert Hargreaves explains how he’d invest £100 or any other sum in a Stocks and Shares ISA to save for the future in today’s market.

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!.

After the recent stock market crash, investing £100 a month or any other amount in an ISA might seem like a risky proposition.

However, now could be the perfect time to start saving for the future. Doing so could help increase your financial prospects and build a sizable financial nest egg.

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.

Saving for the future

The market crash of 2020 has caused significant losses for many investors. Nevertheless, the market’s performance has for years been characterised by periods of boom and bust.

Yet over the long run, investing in the stock market has still proven to be a highly lucrative exercise.

Indeed, since its inception in the mid-1980s, the FTSE 100 has produced total returns in excess of 8% per annum. There have been peaks and troughs along the way, but over the long run, patient ISA investors have been well-rewarded.

The problem is, it’s quite challenging to pick the best time to buy the market.

Investors who bought while the index has been enjoying strong returns in a boom period may have experienced high returns. However, other investors who bought during bear markets and downturns could have produced even higher returns.

Investors who bought near the top of the market have had to weather protracted periods of lousy performance, but have generally seen a positive return over the long term.

One of the best ways to overcome this problem may be to ‘pound cost average’ your ISA investments. Simply put, this means setting up a regular investment plan to buy a set amount of shares every month.

Regular investing ISA

Investing £100, or any other amount, every month in an ISA could help you ride out the peaks and troughs. This will allow you to benefit from the market’s wealth-creating potential over the long run without having to worry about trying to time your investments.

By setting a fixed investment amount every month, the plan will buy more of a particular investment when it falls in value and less when it rises. This approach could help improve your ISA returns over the long run.

Most online stockbrokers now offer this service. You can invest £100 a month into the market through a selection of investment funds. A low-cost tracker fund may be the best option for this amount.

Buying individual stocks and investment trusts could incur significant transaction charges, which may eat into your cash reserves. A market tracker fund would help you regularly invest in an ISA cost-effectively while achieving broad diversification at the click of a button.

As such, by adopting a long-term focus and setting up a regular investment plan, you could dramatically improve your investment prospects. Such an approach would allow you to benefit from the market’s peaks and troughs without having to spend too much time and effort trying to time your investments.

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

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 is needed in an ISA for passive income that covers the UK’s monthly average rent of £1,381?

The UK’s monthly average rent for May 2026 is £1,381. Muhammad Cheema looks at how much is needed to aim…

Read more »

A rear view of a female in a bright yellow coat walking along the historic street known as The Shambles in York, UK which is a popular tourist destination in this Yorkshire city.
Investing Articles

How have BAE Systems shares become a dividend powerhouse? 5 reasons why!

Dividends on BAE Systems shares have risen every year without fail since the early 2000s. So what's the FTSE 100…

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 »

Tanker coming in to dock in calm waters and a clear sunset
Investing Articles

BP shares: still priced as an oil major — but the market may be behind the curve

Andrew Mackie looks at BP shares and why investors may be underestimating the quality and concentration of its underlying asset…

Read more »

A rear view of a female in a bright yellow coat walking along the historic street known as The Shambles in York, UK which is a popular tourist destination in this Yorkshire city.
Investing Articles

At 8.1%, are investors missing the bigger story behind Legal & General shares?

Andrew Mackie explores Legal & General shares and asks whether investors are still viewing it too narrowly as a yield…

Read more »

Young black female footballer training on stadium pitch
Investing Articles

How has this FTSE 250 share surged ANOTHER 7% today?

Applied Nutrition shares have soared on Monday after another brilliant trading update. So what's the FTSE 250 company's secret?

Read more »

Black woman using smartphone at home, watching stock charts.
Investing Articles

The stock market game you’re actually playing (and why you might be losing)

Our writer recounts a painful experience of making a rash stock market decision based on emotions, not logic – and…

Read more »

Aerial shot showing an aircraft shadow flying over an idyllic beach
Investing Articles

Why is EasyJet stock suddenly a takeover target for US investors?

Andrew Mackie looks at easyjet shares jumping on US takeover talk — but is this a genuine re-rating or just…

Read more »