Here’s what an investor needs in an ISA to earn £5,000 of passive income a month

The Stocks & Shares ISA is an incredible vehicle for building wealth and generating a tax-free income. Dr James Fox explains a formula for success.

| 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.

Storytelling image of a multiethnic senior couple in love - Elderly married couple dating outdoors, love emotions and feelings

Image source: Getty Images

A Stocks and Shares ISA is a powerful tool for building long-term wealth and generating passive income. With tax-free gains and dividends, it provides an efficient way to grow investments without losing returns to HMRC.

Over time, compound growth can significantly enhance wealth, making ISAs ideal for those seeking financial security. Whether investing in dividend stocks for passive income or growth shares for capital appreciation, the ISA’s tax advantages and flexibility make it an essential component of any UK investor’s portfolio. So, let’s put a figure on it. In order to receive around £5,000 in monthly passive income from an ISA, I believe an investor would need around £1.2m in the ISA pot.

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.

Here’s the formula

Building a £1.2m ISA pot from scratch takes time, patience, and regular investing. The key is consistency and the power of compound growth. With a fixed amount invested each month, returns start generating returns of their own, accelerating wealth accumulation. For instance, assuming a 7% annual return, investing £1,000 per month for 30 years could grow to around £1.2m. Increasing contributions or extending the timeline further boosts the chances of hitting the target. The earlier investing begins, the less heavy lifting is needed later to achieve financial independence.

Moreover, more successful investors can reach their targets faster and typically with less capital. For instance, £500 of monthly contributions for 30 years growing at a compound annual growth rate (CAGR) of 10.5% would also reach £1.2m.

Source: thecalculatorsite.com

Another important thing to note is the impact of compound interest. As the investment grows, the rate of growth appears to increase too. In the 30th year, the investment would grow by £124k versus £297 in the first year.

Finding diversity

As someone with a relatively mature portfolio, I prefer to pick my own stocks. I have around 25, meaning my portfolio is relatively diversified. But if I were starting afresh I’d look to achieve some diversification by investing in exchange-traded funds (ETFs) or trusts.

With that in mind, investors may want to consider The Monks Investment Trust (LSE:MNKS), which offers a compelling opportunity for long-term capital growth through its diverse global equity portfolio. The trust’s holdings include tech giants like Microsoft, Meta Platforms, and Amazon, alongside innovative companies such as Nvidia and Prosus. This mix of established and growth-oriented firms across various sectors provides a balanced approach to global investing.

With a significant portion invested in the US and smaller allocations in countries like the Netherlands, Japan, and China, Monks also offers broad geographical exposure. The trust’s relatively low ongoing charge of 0.44% makes it an attractive option for cost-conscious investors seeking actively managed global equities.

Moreover, its patient investment strategy, focusing on companies with enduring competitive advantages, aligns well with those looking for sustained value creation. The trust’s long-standing history since 1929 further underscores its resilience through various market cycles.

But while diverisification offers us protection against some risks, investors should note that some of its largest holdings, including Meta and Amazon, have fairly lofty valuations. This may put some investors off.

However, it’s a stock I’ve bought for my daughter’s SIPP.

James Fox has positions in The Monks Investment Trust 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

Person holding magnifying glass over important document, reading the small print
Investing Articles

£20,000 invested in BP shares 1 year ago is now worth…

BP shares have rocketed in the past 12 months, yet analysts think the real growth story is only just beginning,…

Read more »

A pastel colored growing graph with rising rocket.
Investing Articles

A 6.8% forecast yield! 1 often-overlooked FTSE 100 income stock to buy today?

This income stock offers a high forecast yield and strengthening momentum, yet many investors overlook it — creating a rare…

Read more »

GSK scientist holding lab syringe
Investing Articles

GSK’s share price is under £22, but with a ‘fair value’ much higher, is it time for me to buy more right now? 

GSK’s share price rose over the last year, but a huge gap remains between its price and fair value —…

Read more »

Businessman hand stacking money coins with virtual percentage icons
Investing Articles

Here’s how investors can aim for £11,363 a year in passive income from £20,000 in this overlooked FTSE media gem

I think this media stock is commonly overlooked by investors looking for high passive income, but it shouldn’t be, given…

Read more »

Tesla car at super charger station
Investing Articles

Why is Tesla stock down 30% since late 2025?

Tesla stock has been a bit of a car crash in 2026. Edward Sheldon looks at what’s going on, and…

Read more »

UK supporters with flag
Investing Articles

Is Wise now the UK stock market’s top growth share?

Wise rose around 4% in the UK stock market yesterday, bringing its four-year gain to 135%. Why are investors warming…

Read more »

Warhammer World gathering
Investing Articles

£20,000 invested in this FTSE 100 stock 10 years ago is now worth this astonishing amount…

This FTSE 100 stock's delivered an amazing return over the past 10 years. James Beard considers whether it’s worth holding…

Read more »

DIVIDEND YIELD text written on a notebook with chart
Investing Articles

8.4%! Why do Legal & General shares always have such a high dividend yield?

Legal & General shares come with an 8.4% dividend yield. But this is essentially a risk premium for buying shares…

Read more »