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

Image source: Getty Images

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.

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.


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.

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

Young Caucasian man making doubtful face at camera
Investing Articles

At a 5-year low, is it time to call it a day on my Greggs shares?

Mark Hartley considers biting the bullet and taking a loss as his Greggs shares are one of the worst-performing stocks…

Read more »

Stack of British pound coins falling on list of share prices
Investing Articles

As Lloyds’ share price nears £1, is it time to sell the stock?

Lloyds’ share price has had a great run in 2025. With the stock approaching a psychologically-important level, is it time…

Read more »

Google office headquarters
Investing Articles

Warren Buffett’s team just invested billions in this Nasdaq-listed AI stock

This Nasdaq-listed AI stock was looking cheap in Q3. And Warren Buffett’s investment firm Berkshire Hathaway decided to buy it.

Read more »

Passive income text with pin graph chart on business table
Investing Articles

I asked ChatGPT, Gemini, and Claude for the best passive income stock to buy

ChatGPT came up with a very interesting name when Stephen Wright asked for passive income ideas. But is it the…

Read more »

Thoughtful man using his phone while riding on a train and looking through the window
Investing Articles

This growth stock down 50% reminds me of Netflix in 2009

Netflix has been one of the best growth stocks of the past two decades. This writer sees some similarities in…

Read more »

Mother At Home Getting Son Wearing Uniform Ready For First Day Of School
Investing Articles

Lloyds’ share price: with £1 in sight, is it time for cheer or fear?

As the Lloyds shares price continues to hit record highs, there could be trouble on the horizon. Mark Hartley considers…

Read more »

DIVIDEND YIELD text written on a notebook with chart
Investing Articles

9% yield! But is a huge dividend a big problem for this FTSE 250 stock?

Taylor Wimpey was relegated to the FTSE 250 earlier this year. And Stephen Wright thinks a consistent dividend might be…

Read more »

ISA Individual Savings Account
Investing Articles

How a Stocks and Shares ISA could supercharge your passive income

If the UK Budget brings an increase to dividend tax, a Stocks and Shares ISA could give dividend investors a…

Read more »