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 large must my ISA be for a £3,000 monthly passive income?

Discover how to target a reliable long-term passive income with shares, bonds and investment trusts in a diversified ISA.

| More on:
Array of piggy banks in saturated colours on high colour contrast background

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!.

Have you ever considered loading a Stocks and Shares ISA with high-yield dividend shares for passive income? Millions of Britons do. I own a wide range of global dividend stocks.

At the moment, I revinvest the dividends I receive to grow my portfolio. When I retire, I plan to use my cash rewards to supplement my State Pension income.

Should you buy Henderson High Income Trust 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.

But how large will my Stocks and Shares ISA need to be to generate a £3,000 second income every month?

First steps

The good news is I don’t have to factor any cash grabs from the taxman into my calculations. With a tax-efficient ISA, I don’t have to pay a penny in capital gains or dividend tax. And critically for my retirement income, I won’t pay any income tax when I make withdrawals. The dividends I receive are mine and mine alone.

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.

To get a predictable passive income each month, though, I’ll need to diversify my portfolio across different asset classes. Economic conditions can change quickly and significantly. Not building an ISA to cater for this could make my income highly volatile.

For this reason, it’s important to have a collection of shares spanning different industries and parts of the globe. Companies in defensive sectors like utilities, healthcare and telecoms can provide a reliable income across the economic cycle. More cyclical stocks can deliver tasty dividend growth over time.

A mix of both can be a great way to target a long-term second income. It can also be a good idea to add other fixed income assets like bonds for guaranteed income.

Diversification

I like the idea of buying investment trusts to solve this need. Let’s look at Henderson High Income (LSE:HHI) to understand why.

Today, the trust holds shares in 58 companies, the bulk of which are listed in London. This geographic allocation could harm the share price if investor appetite for UK shares declines. But the large number of multinationals on HHI’s books helps protect dividend income from weakness in specific regions.

What’s more, the stocks it owns operate across both cyclical and non-cyclical sectors for extra passive income stability. Some of its largest holdings are British American Tobacco, Lloyds, Rio Tinto and Unilever.

Henderson High Income also holds a wide selection of fixed-income corporate bonds. This blend of shares and bonds has helped the trust grow annual dividends every year for more than a decade.

Investment trusts can be a great way to source passive income
Source: Janus Henderson

The final question

The last thing I need to think about when targeting a future passive income is dividend yield.

For our monthly target of £3,000, I’ll need my ISA to be worth £900,000 if packed with shares yielding an average 4%. The amount is £720,000 if the average yield is 5%, and £600,000 based on a 6% yield. You get the idea.

Targeting stocks with higher dividend yields can come with extra risk. Greater dividend yields can indicate an unsustainable dividend, or a company facing significant challenges whose share price has slumped.

However, building a diversified portfolio as I’ve described can spread these risks and generate a predictable long-term passive income. Someone investing £500 a month could achieve that £600k ISA in under 25 years with a 9% average annual return.

Royston Wild has no position in any of the shares mentioned. The Motley Fool UK has recommended British American Tobacco P.l.c., Lloyds Banking Group Plc, and Unilever. 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

A row of satellite radars at night
Investing Articles

This ex-penny stock has crushed Rolls-Royce shares over 5 years! Is there more to come?

With all eyes on Rolls-Royce shares, this growth share with a connection to SpaceX might have gone unnoticed by a…

Read more »

Close-up as a woman counts out modern British banknotes.
Investing Articles

With a 6.4% yield and P/E of 10 is this FTSE dividend stock a hidden passive income gem?

Building a portfolio of solid UK dividend stocks isn't hard. Paul Summers takes a closer look at one high-yielding candidate…

Read more »

Black woman using smartphone at home, watching stock charts.
Growth Shares

At 112p, where next for the Lloyds share price? 168p or 56p?

Jon Smith mulls over the direction going forward for the Lloyds share price, and explains why two very different scenarios…

Read more »

Investing Articles

This dividend stock has a 7.3% yield, and Stocks and Shares ISA investors are buying!

Looking to move from a Cash ISA to a Stocks and Shares ISA to target passive income? Alan Oscroft has…

Read more »

Surprised Black girl holding teddy bear toy on Christmas
Investing Articles

Could Rolls-Royce shares lock in another 34% gain before Christmas?

Mark Hartley takes a look at some of the more optimistic price targets for Rolls-Royce, and considers a best-case scenario.…

Read more »

This way, That way, The other way - pointing in different directions
Investing Articles

Investec vs Aberdeen: which is the better income stock to buy?

Aiming to boost the average yield of his income portfolio, Mark Hartley's looking for new income stocks to buy on…

Read more »

Asian man looking concerned while studying paperwork at his desk in an office
Investing Articles

Down 41% since January, this quality S&P 500 stock is stinking out my ISA

The tide's turned against this S&P 500 robotics stock. Is it time to dump it? Or is there a no-brainer…

Read more »

GSK scientist holding lab syringe
Investing Articles

By mid-2027, analysts expect £6,000 in GSK shares to be worth…

GSK shares are currently trading almost 20% below their 2026 highs. Is there potential for a rebound over the next…

Read more »