£20,000 in an ISA? Here’s how I’d aim to make £1,250 a month in passive income

Our writer thinks one rare FTSE 100 stock could help drive an ISA portfolio higher, resulting in a sizeable passive income down the road.

| 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.

Smiling family of four enjoying breakfast at sunrise while camping

Image source: Getty Images

Fifteen grand a year in passive income isn’t going to allow me to retire, but it’s enough to make life easier.

Here, I’ll explore how £20k invested in shares could lead me to a £1,250-a-month passive income stream.

Choosing the right vehicle

To start, I’m always going to invest in my Stocks and Shares ISA. This account allows me to invest in a wide selection of shares, investment trusts, and exchange-traded funds.

It also enables my portfolio to grow free from the grubby mitts of the taxman, as any capital gains or dividends earned within my ISA are not subject to tax. For me, it’s an absolute no-brainer!

Of course, shares don’t always go up and dividends aren’t certain to be paid. So diversification is very important to minimise risk.

Personally, I reckon £20k invested evenly in 10 shares provides a solid foundation and adequate level of diversification. Any more would start to spread my investments too thinly, diluting potential gains.

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.

Choosing my shares

Many investors choose to buy blue-chip UK dividend shares to aim for passive income straight away. Due to the high yields around right now, I think it’s entirely realistic to build a quality income portfolio that yields 7%.

However, this isn’t going to get me anywhere close to £1,250 a month. To aim for this, I prefer to build a portfolio with more long-term growth potential, then switch fully to dividends and passive income later on.

Potential hedge fund bargain

One unique FTSE 100 stock that I own in my ISA and think has great long-term growth potential is Pershing Square Holdings (LSE: PSH).

This is an investment trust that gives me exposure to the hedge fund of renowned Wall Street investor Bill Ackman. He looks for firms with competitive advantages, strong management teams, and scalable operations.

Hedge funds are normally limited to the well-heeled, so this is a pretty rare stock. Ackman has returned 22% annually over the last five years, which easily beats the S&P 500‘s 16%.

That’s no mean feat, and it’s propelled Pershing Square stock 155% higher in five years!

Ackman specialises in investing in time-tested brands that have fallen on hard times. For example, he invested in Chipotle Mexican Grill in 2016 after an E. coli outbreak, generating fantastic long-term returns.

Recently, he bought shares of Nike after the share price bombed due to weak consumer spending and mounting competition.

One risk here though is Ackman himself (key person risk). If he lost his touch or wasn’t able to carry on for some reason, the hedge fund’s value would be jeopardised. I could lose money on my investment.

Still, the shares have fallen 15% since June and are now trading at a 36% discount to the fund’s underlying net asset value. This suggests that the stock may be significantly undervalued, which is why I’m keen to add to my holding the next time I have cash available.

Enjoying income

With stocks like this, I think it’s realistic for me to aim for an average 10% return over time, reinvesting dividends along the way to compound my returns.

Here’s how that would play out.

YearAccrued interestBalance
1£2,000£22,000
5£12,210£32,210
10£31,874£51,874
15£63,544£83,544
25£196,694£216,694

Once I reach £216k, I’ll have the option to switch to a 7%-yielding dividend portfolio. This would provide me with annual passive income of £15,168 — or just over £1,250 a month.

Ben McPoland has positions in Pershing Square. The Motley Fool UK has recommended Nike. 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

Santa Clara offices of NVIDIA
Investing Articles

£5,000 invested in Nvidia stock 6 months ago is now worth…

Nvidia stock's taking a breather at the moment. But it could be getting ready for its next move higher, says…

Read more »

British coins and bank notes scattered on a surface
Investing Articles

I hold Lloyds. Is it madness to buy Barclays shares too?

Harvey Jones is keen to buy Barclays shares but wonders whether he's simply doubling down, given that he already holds…

Read more »

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

It’s time we all took a long, cold look at the Lloyds share price

The Lloyds share price has been good to Harvey Jones, making him a huge fan of the FTSE 100 bank.…

Read more »

Warren Buffett at a Berkshire Hathaway AGM
Investing Articles

Warren Buffett didn’t retire early. But could his investing wisdom help you do so?

Warren Buffett's wisdom from decades of stock market investing is actionable even for a modest investor who simply aims to…

Read more »

Young female hand showing five fingers.
Investing Articles

5 compelling investment ideas for a Stocks and Shares ISA in 2026

Edward Sheldon discusses some ideas to consider for a Stocks and Shares ISA and highlights a UK stock that could…

Read more »

Man writing 'now' having crossed out 'later', 'tomorrow' and 'next week'
Investing Articles

Is this the best time to buy shares in a long time?

Earlier this week, Bill Ackman stated on X that this is the best time to buy shares in a long…

Read more »

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.
Investing Articles

£1,000 buys 35 shares in an incredibly reliable FTSE 100 dividend stock

Despite falling 72% from their highs, shares in this FTSE 100 company have been an incredibly reliable source of dividend…

Read more »

Warren Buffett at a Berkshire Hathaway AGM
Investing Articles

This is what Warren Buffett has to say about passive income — and I’m listening!

While searching for new ways to earn passive income, our writer takes to heart sage advice from the Oracle of…

Read more »