Share your opinion and earn yourself a free Motley Fool premium report!

We are looking for Fools to join a 75 minute online independent market research forum on 15th / 16th December.

To find out more and express your interest please click here

How much is needed in an ISA for a £2k monthly second income

The Stocks and Shares ISA is an amazing vehicle for building wealth and earning a second income. Dr James Fox reveals his passive income formula.

| 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.

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

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.

Generating a £2,000 monthly second income through a Stocks and Shares ISA is an achievable goal with careful planning and disciplined investing. Assuming a 5% withdrawal rate — achieved through dividend stocks — for portfolio sustainability, an investor would need an ISA valued around £480,000.

Scared already?

£480,000 might sound like a lot of money. And it is. However, building a portfolio this large is much easier than many Britons think. It simply takes time.

To illustrate, let’s consider a 30-year-old who starts investing £1,000 monthly in a Stocks and Shares ISA. Assuming an average annual return of 8% (which is in line with historical stock market performance), by age 55, their ISA could be worth over £480,000. This scenario doesn’t even utilise the full £20,000 annual ISA allowance.

It’s crucial to remember that consistency is key. Regular contributions, coupled with the power of compound interest, can turn seemingly small sums into significant wealth over time. Moreover, as one’s career progresses and earnings potentially increase, there may be opportunities to boost contributions, accelerating progress towards the goal.

However, it’s also important to highlight that some investors achieve much higher rates of return. My portfolio value has almost doubled over the last year and my long-term average is very strong.

For example, if a 15% rate of return was average over 28, an investor could reach this £480,000 mark with just £100 of monthly contributions. This is demonstrated in the graph below.

Created at thecalculatorsite.com

One stock to consider for the journey

Currently, I’m employing several different strategies for several different portfolios. The smallest of these is my daughter’s pension — as a one-year-old, her maximum contribution is around £240 per month, which is topped up by the government.

Despite a long time to maturation, I’m still following a growth-oriented approach. And because I’m investing relatively small figures, I’m preferring funds and ETFs to gain diversification, such The Monks Investment Trust, Scottish Mortgage Investment Trust, and Berkshire Hathaway (NYSE:BRK.B).

The latter presents an interesting opportunity at this moment. Berkshire has increasingly sold some of its prized holdings, including Apple, and now sits on $300bn in cash. This cash will likely be put to work on opportunistic acquisitions if the market goes into reverse.

However, this is a long-term investment into America. Warren Buffett’s conglomerate owns some of the most important parts of the American economy including banks, payment card services, railroads, and insurance.

Nonetheless, as with every investment, there are some risks. The conglomerate’s immense size may limit future growth opportunities, as finding acquisitions or investments capable of significantly moving the needle becomes increasingly difficult in today’s competitive market. 

James Fox has positions in Berkshire Hathaway, The Monks Investment Trust PLC, and Scottish Mortgage 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

Young woman holding up three fingers
Investing Articles

Want to start investing in 2026? 3 things to get ready now!

Before someone is ready to start investing in the stock market, our writer reckons it could well be worth them…

Read more »

Investing Articles

Can the stock market continue its strong performance into 2026?

Will the stock market power ahead next year -- or could its recent strong run come crashing down? Christopher Ruane…

Read more »

Businessman hand stacking money coins with virtual percentage icons
Investing Articles

Here’s how someone could invest £20k in an ISA to target a 7% dividend yield in 2026

Is 7% a realistic target dividend yield for a Stocks and Shares ISA? Christopher Ruane reckons that it could be.…

Read more »

A quiet morning and an empty Victoria Street in Edinburgh's historic Old Town.
Investing Articles

How little is £1k invested in Greggs shares in January worth now?

Just how much value have Greggs shares lost this year -- and why has our writer been putting his money…

Read more »

Businessman using pen drawing line for increasing arrow from 2024 to 2025
Investing Articles

This cheap FTSE 100 stock outperformed Barclays, IAG, and Games Workshop shares in 2025 but no one’s talking about it

This FTSE stock has delivered fantastic gains in 2025, outperforming a lot of more popular shares. Yet going into 2026,…

Read more »

Close-up of British bank notes
Investing Articles

100 Lloyds shares cost £55 in January. Here’s what they’re worth now!

How well have Lloyds shares done in 2025? Very well is the answer, as our writer explains. But they still…

Read more »

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

How much do you need in an ISA to target £2,000 a month of passive income

Our writer explores a passive income strategy that involves the most boring FTSE 100 share. But when it comes to…

Read more »

Investing Articles

£5,000 invested in a FTSE 250 index tracker at the start of 2025 is now worth…

Despite underperforming the FTSE 100, the FTSE 250 has been the place to find some of the UK’s top growth…

Read more »