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.

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.

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

Image source: Getty Images

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

DIVIDEND YIELD text written on a notebook with chart
Investing Articles

How big does an ISA need to be to aim for a £1,500 monthly second income?

Harvey Jones shows how building a balanced portfolio of FTSE 100 dividend stocks can produce a high-and-rising second income in…

Read more »

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 »