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.

If a 40-year-old put £500 a month in an empty ISA, here’s what second income they might have at 65

Harvey Jones shows how investing regular monthly sums in FTSE 100 shares can build up to a substantial second income from dividends over time.

| More on:
Middle aged businesswoman using laptop while working from home

Image source: Getty Images

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!.

Investing in a Stocks and Shares ISA can be a great way to build a second income stream for retirement. 

By regularly investing and letting compound growth work its magic, even relatively modest monthly sums can add up to a sizeable pot.

Should you buy National Grid Plc 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.

While it’s never too late to start, it’s definitely better to begin early. That gives more time for compound interest to work its magic.

Let’s say a 40-year-old has only just woken up to the attractions of investing in an ISA, and can afford to put away £500 a month.

Now let’s assume they stick at it for 25 years, and their portfolio grows at an average annual rate of 7%, in line with the long-term FTSE 100 average total return. They could build a nest egg of £406,059 by the time they turn 65.

FTSE 100 dividends can fund a retirement

If they upped their monthly payments as their income increased, and threw in lump sums when they had cash to hand, they could end up with a lot more than that.

Now, let’s say their portfolio generated an annual yield of 6%. That’s above the FTSE 100 average yield of 3.5%, but is doable by targeting stocks that pay above average dividends.

On a £406,059 pot, they’d generate an impressive £24,364 a year, without touching their capital. That’s more than £2,000 a month in passive income.

Crucially, their capital remains intact, meaning they could continue drawing income for decades. Or take lump sums too.

Right now, there are plenty of top dividend stocks to choose from. National Grid (LSE: NG.) is a favourite among income investors.

As a regulated utility, it delivers essential electricity and gas services across the UK and parts of the US. 

This stable business model allows it to generate reliable cash flow, which in turn supports a steady dividend payout. Right now, the stock has a trailing dividend yield of 6.3%.

As with every stock, there are risks. National Grid is investing heavily in the transition to green energy, which requires substantial capital expenditure. We’re looking at £60bn in the next five years.

Even National Grid shares carry risk

Last year, it even asked shareholders for more money through a rights issue. This uncertainty has weighed on the stock, which is down 4% over the last year and flat over five.

Yet it looks unusually good value by its own standards, currently trading at just 10 times earnings. That could make now an interesting entry point to consider for long-term investors looking to lock in a high yield.

Relying on a single stock would be risky. Our hypothetical 40-year-old investor should aim to build a diversified portfolio of around 15 different shares. This would help spread risk, balance income and offer more capital growth potential.

By focusing on high-yield dividend stocks like National Grid and maintaining a well-diversified portfolio, investors could set themselves up for a comfortable and secure retirement.

History suggests the stock market should deliver a far superior return to cash over time, but with volatility along the way. We’re seeing some of that volatility right now. This actually favours investors who pay in regular monthly sums, as their contribution buys more shares when markets are down. The ISA deadline is fast approaching. Time to get stuck in.

Harvey Jones has no position in any of the shares mentioned. The Motley Fool UK has recommended National Grid Plc. 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

Santa Clara offices of NVIDIA
Investing Articles

Up 1,200% in 5 years, here’s why Nvidia could still be a brilliant value stock

An exciting new announcement that could reshape the PC industry has just pushed Nvidia stock... well, just about nowhere really.

Read more »

House models and one with REIT - standing for real estate investment trust - written on it.
Investing Articles

How investing £4.50 a day could set you on the way to a £1,505 monthly second income

How can UK stocks with high dividend yields help investors earn a meaningful second income from the price of a…

Read more »

Investing Articles

Up 103% with a P/E of 261 — is this FTSE 100 stock still worth buying?

One FTSE 100 stock is quietly moving higher while most investors are still looking elsewhere — is the market missing…

Read more »

Concept of two young professional men looking at a screen in a technological data centre
Investing Articles

The smart money thinks AI stocks look risky — but is there still a chance to buy?

According to fund managers, the AI trade is getting crowded. But they still seem to think it’s the place to…

Read more »

Man putting his card into an ATM machine while his son sits in a stroller beside him.
Investing Articles

Barclays shares are 11% below their 52-week high. Could they be a bit of a bargain to consider?

Overpriced or one of the FTSE 100’s hidden gems? James Beard takes a closer look at how the market is…

Read more »

Stack of one pound coins falling over
Investing Articles

Down 65% but yielding 6.7% – is this beaten-down UK stock now a generational bargain?

Harvey Jones says this UK stock is one of the worst FTSE 100 performers but there are sound reasons to…

Read more »

Portrait of elderly man wearing white denim shirt and glasses looking up with hand on chin. Thoughtful senior entrepreneur, studio shot against grey background.
Investing Articles

Is this FTSE stock really 46% undervalued?

Analysts reckon this FTSE stock should be worth nearly 50% more. James Beard considers why there’s so much positivity surrounding…

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 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 »