Putting £500 aside each month? Here’s how I’d aim for £90,400 in passive income

Passive income is the holy grail of investing for many of us. However, reaching a position where it’s actually life-changing can take time.

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.

Smiling white woman holding iPhone with Airpods in ear

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.

Plenty of us put a bit of cash aside each month. But not all of us make that money work as hard as it could do. And unfortunately, that’s what we need to do if we want our savings to turn into passive income.

So how can I turn my monthly savings into a monster passive income?

Savings accounts

The majority of us in the UK put our money in savings accounts rather than investing in stocks and shares. In fact, as a country, our participation in the stock market is quite low, at just 8%. Meanwhile, Britons have ploughed over £1.8trn into savings accounts rather than investing.

Obviously, it’s great that we’re putting money aside. However, savings accounts don’t offer the best rates of return.

For example, my HSBC savings account is currently offering me 2% AER, and that’s up from 0.25% over the past decade.

If I had left my money in there, I really wouldn’t have seen much growth. And looking forward, I still wouldn’t be getting much in the way of interest.

Just look at the example below. Here, I’ve assumed AER of 1% on average over 30 years while putting aside £500 a month — which is my personal aim.

Created at thecalculatorsite.com

But as we can see, the accrued interest is only a fraction of my deposits. After 30 years, I’d have £209k, with £29k of that being interest.

We can do much better.

Investing and compounding

On the other hand, investing is more risky, but offers the opportunity for much better returns. In fact, novice investors aim for returns in the realm of 6-10%, while I aim for annualised returns in low double digits.

And, of course, these returns compound over time. Compound returns mean earning money not just on the original investment, but also on the money I’ve already made.

It’s like making interest on my interest. Over time, this snowball effect can grow my wealth faster, as my earnings keep building on themselves.

As we can see from the example below, the growth rate is exponential as my money compounds year after year. Here’s how £500 a month grows with a 10% annualised return. After 30 years, I’d have £1.13m.

Created at thecalculatorsite.com

Generating passive income

Once I’ve generated a level of wealth that I’m happy with, I can then think about generating passive income. The easiest way to do this would be to transition my investments towards dividend-paying stocks.

Of course, we’re talking 30 years’ time but, at the moment, I’d invest in companies like Legal & General and Phoenix Group which offer dividend yields of 8.1% and 10.1% respectively.

If I were able to achieve an average dividend yield of 8% with a portfolio of £1.13m, I’d be earning £90,400 a year in passive income. That’s a really healthy return, even though inflation would make it worth a lot less than it is today.

It all sounds great, but I’ve got to be wary of making mistakes. Many novice (and experienced) investors get it wrong and lose money. I also have to remember that I might undershoot my percentage returns target. That’s why I need to use the array of resources available to me, including The Motley Fool.

HSBC Holdings is an advertising partner of The Ascent, a Motley Fool company. James Fox has positions in HSBC Holdings, Legal & General Group Plc and Phoenix Group Holdings plc. The Motley Fool UK has recommended HSBC Holdings. 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

British bank notes and coins
Investing Articles

Here’s a £30-a-week plan to generate passive income!

Putting a passive income plan into action need not take a large amount of resources. Christopher Ruane explains how it…

Read more »

Close-up of British bank notes
Investing Articles

Want a second income? Here’s how a spare £3k today could earn £3k annually in years to come!

How big can a second income built around a portfolio of dividend shares potentially be? Christopher Ruane explains some of…

Read more »

Close-up of British bank notes
Investing Articles

£20,000 for a Stocks and Shares ISA? Here’s how to try and turn it into a monthly passive income of £493

Hundreds of pounds in passive income a month from a £20k Stocks and Shares ISA? Here's how that might work…

Read more »

Snowing on Jubilee Gardens in London at dusk
Investing Articles

£5,000 put into Nvidia stock last Christmas is already worth this much!

A year ago, Nvidia stock was already riding high -- but it's gained value since. Our writer explores why and…

Read more »

Investing Articles

Are Tesco shares easy money heading into 2026?

The supermarket industry is known for low margins and intense competition. But analysts are bullish on Tesco shares – and…

Read more »

Smiling black woman showing e-ticket on smartphone to white male attendant at airport
Investing Articles

Can this airline stock beat the FTSE 100 again in 2026?

After outperforming the FTSE 100 in 2025, International Consolidated Airlines Group has a promising plan to make its business more…

Read more »

Investing Articles

1 Stocks and Shares ISA mistake that will make me a better investor in 2026

All investors make mistakes. The best ones learn from them. That’s Stephen Wright’s plan to maximise returns from his Stocks…

Read more »

Portrait Of Senior Couple Climbing Hill On Hike Through Countryside In Lake District UK Together
Investing Articles

I asked ChatGPT if £20,000 would work harder in an ISA or SIPP in 2026 and it said…

Investors have two tax-efficient ways to build wealth, either in a Stocks and Shares ISA or SIPP. Harvey Jones asked…

Read more »