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 big does an ISA need to be to target £1,500 in monthly second income?

Paul Summers explores how much cash it takes to earn a tax-free second income of £1,500 in 2025. He also highlights a stock that might help achieve it.

| More on:
Businessman hand stacking money coins with virtual percentage icons

Image source: Getty Images

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.

You probably don’t need me to tell you that the idea of earning a second income is very attractive, especially if it involves relatively little effort. In time, it may even be enough to allow someone to reduce the hours their main job takes up. And I’d say that the stock market is the best opportunity most of us have for making that money. This is assuming we can stay the course if things get choppy, of course.

So, just how much money does an investor already need to have to aim for, say, £1,500 per month (or £18,000 per year)?

XXX

The first step

Before getting to that, I reckon it’s important to start with a good foundation.

In my opinion, using a Stocks and Shares ISA to hold investments is as close to a ‘no brainer’ as one can get. Doing so means any profit or dividends are completely shielded from HMRC.

Please note that tax treatment depends on the individual circumstances of each client and may be subject to change in future. The content in this article is provided for information purposes only. It is not intended to be, neither does it constitute, any form of tax advice.

Having opened an ISA, what does one do next?

One option is to invest money into an index tracker. As it sounds, this type of fund ‘tracks’ the return of a specific group of companies. The FTSE 100 is the best known index in the UK. And the great thing about funds following it is that they also generate dividends.

The only problem with this is that the dividend yield on the FTSE 100 is about 3.1%. According to my calculations, this would mean an investor would already need to have a smidgen over £580,000 in their ISA.

But there is a way of getting that big sum down.

Searching for higher yields

One of the great things about being a UK investor is that there’s no shortage of stocks offering more than the FTSE 100.

One example that I hold myself is Persimmon (LSE: PSN). As one of the UK’s biggest housebuilders, it’s arguably positioned well to gain from the government’s pro-housing agenda. I particularly like that its homes tend to be more affordable than rivals.

As thing stand, the shares are also down to yield 5.1% in 2025, rising to 5.4% in 2026, if analysts are correct. Using the latter, an investor would need an ISA pot of around £335,000 to generate that £1,500 per month.

I get it — that’s still a hefty amount of money. But it does demonstrate how looking for high-dividend stocks has the potential (and that last word is key) for getting an investor to their second income goal much sooner.

Second income can’t be guaranteed

I need to emphasise that last point one more time. There’s no sure thing in the stock market.

Part of the reason Persimmon shares in particular offer such a juicy yield is because the share price has been suffering. The ongoing cost-of-living crisis and wider economic uncertainty aren’t exactly boosting demand for new homes. Oh and there’s next month’s Budget — and its impact on the property market — to ruminate on.

So, how might an investor protect themselves?

Well, we’re big fans of spreading money around a diverse bunch of stocks at Fool UK. By doing this, any dips in income — perhaps as a result of some companies cutting their distributions — shouldn’t be catastrophic.

I’m crossing my fingers that Persimmon won’t need to be one of them.

Paul Summers owns shares in Persimmon Plc. 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 »