See how much an investor needs in an ISA to fund an £888 monthly passive income

Harvey Jones grabs his calculator to work out how much money people need to generate a decent passive income in retirement, and how much they need to put away.

| 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.

Three generation family are playing football together in a field. There are two boys, their father and their grandfather.

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.

Passive income has always struck me as the holy grail of investing. A regular payment landing in my account, without me having to lift a finger. Ideally, generated inside a Stocks and Shares ISA.

To generate £888 a month, or £10,656 a year, I’d need to think carefully about what kind of payout I’m aiming for. Many people use the so-called 4% rule, which assumes investors draws 4% a year from a pot without running it down too fast. That would mean needing a hefty £266,400 to hit my income target.

That’s quite a chunk of change. But I think it’s possible to bring that number down a fair bit, depending on the stocks I pick and the yields they offer.

Higher yields, smaller pot

One of my favourite second income stocks is FTSE 100 wealth manager M&G (LSE: MNG). A year ago, it was yielding close to 10%. That’s since dipped to around 7.9% as the shares have enjoyed a strong run.

They’ve climbed 25% over 12 months, and 60% over five years. Not bad for a stock many wrote off as purely an income play. Possibly including me.

M&G isn’t without risk. Markets remain shaky, and the long shift to passive investing is still a threat to its active management model. With interest rates staying higher for longer, income seekers may find cash and bonds more tempting than equity income stocks, where capital is at risk. The dividend is set for modest growth, with the board targeting 2% annual increases.

But there’s still potential. On 30 May, M&G revealed that Japan’s Dai-ichi Life will be taking a 15% stake, bringing an estimated $6bn of new investment into its funds over the next five years. That has given sentiment a lift. I suspect share price growth may slow after its strong run, but I think M&G is still worth considering with a long-term view.

Even so, I wouldn’t pile everything into a single income stock, no matter how juicy the yield. Instead, I’d spread my money around and aim for a more realistic average yield of 5.5%.

Compounding and growing

With a 5.5% yield, I’d need around £193,745 in my ISA to generate £10,656 of annual income and hit that £888 monthly goal. That assumes I live off the dividends, and leave the capital untouched to keep growing over time.

That’s almost £195,000 which sounds like a lot, and it is. But over a 40-year working life, I think it’s achievable. For example, investing just £75 a month at an average growth rate of 7% – roughly in line with the long-term FTSE 100 average – could do the trick.

Naturally, there are risks. Stock markets can go down as well as up. Inflation will nibble away at the buying power of that £888. So I’d encourage anyone with long-term ambitions to save more if they can.

But this shows that with patience, consistency and a little know-how, building a decent ISA income pot is far from impossible. I’d say income investors might consider buying high-yield stocks where the fundamentals still stack up, while diversifying to help smooth out the ride.

Harvey Jones has positions in M&g Plc. The Motley Fool UK has recommended M&g Plc. 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

Yellow number one sitting on blue background
Investing Articles

I asked ChatGPT to pick 1 growth stock to put 100% of my money into, and it chose…

Betting everything on a single growth stock carries massive danger, but in this thought experiment, ChatGPT endorsed a FTSE 250…

Read more »

Portrait of pensive bearded senior looking on screen of laptop sitting at table with coffee cup.
Investing Articles

How little is £1,000 invested in Diageo shares at the start of 2025 worth now?

Paul Summers takes a closer look at just how bad 2025 has been for holders of Diageo's shares. Will things…

Read more »

Aston Martin DBX - rear pic of trunk
Investing Articles

After a terrible 2025, can the Aston Martin share price bounce back?

The Aston Martin share price has shed 41% of its value in 2025. Could the coming year offer any glimmer…

Read more »

Close-up of British bank notes
Investing Articles

How much do you need in an ISA to target £3,000 per month in passive income?

Ever thought of using an ISA to try and build monthly passive income streams in four figures? Christopher Ruane explains…

Read more »

piggy bank, searching with binoculars
Investing Articles

Want to aim for a million with a spare £500 per month? Here’s how!

Have you ever wondered whether it is possible for a stock market novice to aim for a million? Our writer…

Read more »

Investing Articles

Want to start buying shares next week with £200 or £300? Here’s how!

Ever thought of becoming a stock market investor? Christopher Ruane explains how someone could start buying shares even on a…

Read more »

Rear view image depicting a senior man in his 70s sitting on a bench leading down to the iconic Seven Sisters cliffs on the coastline of East Sussex, UK. The man is wearing casual clothing - blue denim jeans, a red checked shirt, navy blue gilet. The man is having a rest from hiking and his hiking pole is leaning up against the bench.
Investing Articles

2 ideas for a SIPP or ISA in 2026

Looking for stocks for an ISA or SIPP portfolio? Our writer thinks a FTSE 100 defence giant and fallen pharma…

Read more »

Midnight is celebrated along the River Thames in London with a spectacular and colourful firework display.
Investing Articles

Could buying this stock at $13 be like investing in Tesla in 2011?

Tesla stock went on to make early investors a literal fortune. Our writer sees some interesting similarities with this eVTOL…

Read more »