How much money do I to put into need in an ISA for £1,000 in passive income each month?

The Stocks and Shares ISA is an incredible vehicle for Britons to build wealth and take an income from their investments. Not enough of us use it.

| More on:

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.

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.

Close-up image depicting a woman in her 70s taking British bank notes from her colourful leather wallet.

Image source: Getty Images

The Stocks and Shares ISA allows Britons to contribute up to £20,000 each year into a tax-free investment portfolio. In terms of wealth creation in the UK, there’s nothing quite like it.

To generate £1,000 in passive income each month (£12,000 per year) from a Stocks and Shares ISA, an investor would need a portfolio of around £240,000 yielding 5% annually.

That’s a substantial sum, but the beauty of compounding means it doesn’t have to be built overnight.

For instance, investing £400 a month into a diversified ISA returning an average of 8% per year could grow to roughly £235,000 after 20 years.

Each year, the returns themselves start earning returns — that’s compounding in action. Early contributions have decades to grow, while later ones benefit from an ever-larger base.

The key is consistency and time in the market, not timing it. Even modest, regular investments can snowball into a meaningful passive income stream, particularly when sheltered from tax within an ISA.

Created at thecalculatorsite.com

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. Readers are responsible for carrying out their own due diligence and for obtaining professional advice before making any investment decisions.

Where to invest?

Ok, so we’ve explored how this could be achieved in theory, but the next part is know what to do to get there. After opening a Stocks and Shares ISA with a brokerage, investors need to choose which stocks to buy with their hard-earned cash.

The options — depending on the brokerage — are typically vast. There’s everything from funds and trusts to stocks and bonds.

Funds and investment trusts pool money from many investors to buy a diversified mix of assets, managed by professionals aiming to generate steady returns.

They’re often seen as an easier way to spread risk without picking individual shares. Stocks, on the other hand, represent ownership in specific companies — higher risk, but with the potential for higher long-term gains.

Bonds are essentially loans to governments or corporations that pay fixed interest, offering stability and predictable income.

Personally, as a more experienced investor, my portfolio is geared towards a wide range of stocks. A data-driven approach helps me achieve returns that are typically far in excess those of an index-tracking fund.

A current favourite

My only investment in the month of October has been the London Stock Exchange Group (LSE:LSEG). According to analyst consensus, the London Stock Exchange Group is currently viewed as the most undervalued company on the FTSE 100.

Forecasts suggest a 42% discount to fair value. However, such estimates must be treated with caution as analyst coverage can vary in quality. So, why is it so undervalued?

The London Stock Exchange Group has a wide economic moat and high margin operations, especially in data and analytics. It also offers double-digit earnings growth while trading at a little over 20 times forward earnings.

However, no stock is perfect. Risks remain. Competition in data and analytics is fierce, and the transition away from legacy products could dent recurring revenues.

Still, for long-term investors, these risks may be balanced by the firm’s diversified, high-margin operations. I certainly believe it’s a stock worth considering.

James Fox has positions in London Stock Exchange Group. 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

GSK scientist holding lab syringe
Investing Articles

Why is everyone buying GSK shares?

GSK shares have been outperforming the FTSE 100 in 2026. Paul Summers takes a closer look and asks whether this…

Read more »

Middle-aged white man pulling an aggrieved face while looking at a screen
Investing Articles

£10,000 invested in easyJet shares at the start of 2026 is now worth…

Anyone buying easyJet shares will have endured a rough ride since January. Paul Summers wonders whether things could get even…

Read more »

Close-up of a woman holding modern polymer ten, twenty and fifty pound notes.
Investing Articles

5 years ago, £5,000 bought 2,645 Barclays shares. But how many would it buy now?

Despite delivering an impressive return since April 2021, Barclays' shares have lagged the FTSE 100's other banks. James Beard considers…

Read more »

Side of boat fuelled by gas to liquids, advertising Shell GTL Fuel
Investing Articles

5 years ago, £5,000 bought 354 Shell shares. But how many would it buy now?

When it comes to Shell’s numbers, most of them are impressive. And it’s no different when looking at the recent…

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

I asked ChatGPT if I should buy Aviva, Diageo or BAE Systems stock and it said…

Aviva, Diageo and BAE Systems shares are popular FTSE 100 picks. But which of the three does ChatGPT like the…

Read more »

Tesla car at super charger station
Investing Articles

SpaceX’s IPO threatens to leave the Tesla share price on the forecourt

As Elon Musk starts fuelling the engines for a SpaceX IPO, could the Tesla share price get left in the…

Read more »

Investor looking at stock graph on a tablet with their finger hovering over the Buy button
US Stock

A once-in-a-decade chance to buy software stocks?

Michael Burry thinks now is the time to think about buying falling tech stocks. But it might depend on which…

Read more »

Young mixed-race couple sat on the beach looking out over the sea
Investing Articles

Here’s how a £20k ISA could generate a £1,000 weekly second income

Drip-feeding money into a Stocks and Shares ISA can put you on track to a four-figure second income. Royston Wild…

Read more »