This simple passive income idea could earn me £300 a month

By investing the right amount in well-chosen shares, this writer believes he could earn hundreds of pounds in monthly passive income.

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.

From setting up an online shop to buying a rental property, the world is full of passive income ideas that to me look anything but passive.

By contrast, putting money into the shares of proven blue-chip businesses, then sitting back and letting them pay me regular dividends, is the sort of passive income idea I can really get excited about. Indeed, like millions of people, I am already earning money that way without working for it.

If I wanted to target £300 a month on average doing that, here is how I would go about it.

Finding shares to buy

My starting point would be finding the sorts of firms I reckoned may pay beefy dividends far into the future.

Some people try to do that by looking at current yields. Diversified Energy, for example, currently has a dividend yield of 15.4%. That means for every £100 I invested in Diversified shares today, I would hopefully earn over £15 annually in dividends.

I say ‘hopefully’ because dividends are not guaranteed at Diversified – or any other company. That is why, rather than focusing on yield, I look at the fundamentals of a business.

Is there going to be a large market of potential customers for its products or services? Does it have some edge over rivals that means it will not need to compete on price alone? Will the company be able to distribute excess cash to shareholders as dividends, or will it need to be spent on other priorities such as paying down debt?

Building a portfolio

Such an approach may whittle down my options considerably. That is fine by me. I want to focus on high-quality companies that meet my investment criteria for passive income potential, including when it comes to their valuation.

If I cannot find such shares today, I will wait. Such is the patience of the long-term investor.

I want to build a portfolio of such shares, rather than put all my eggs in one basket. To do so, I would set up a share-dealing account, or Stocks and Shares ISA.

Setting a target

How much would I need to invest to hit my target of £300 a month?

That depends on the average yield of my portfolio. £300 per month is £3,600 a year. At a 10% yield, I could earn that with a £36,000 investment. A 5% yield would require me to invest £72,000.

With my focus on quality and value, I would not choose shares just because of their yield. That might mean that to hit my target, I need to invest more money than I have available today.

In that case, I would aim to build my portfolio over time. I could hopefully start earning at least some passive income in a matter of months, even if it took me much longer finally to hit my monthly target of £300.

C Ruane has no position in any of the shares mentioned. 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

UK financial background: share prices and stock graph overlaid on an image of the Union Jack
Investing Articles

These 2 UK shares were stinking out my SIPP – now they’re flying! What next?

Harvey Jones has been given a very bumpy ride by these two UK shares. But now they're looking up and…

Read more »

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

I’ve just added this under-the-radar FTSE 100 stock to my SIPP

James Beard explains why he’s put this relatively unknown share in his Self-Invested Personal Pension (SIPP). And so far, he…

Read more »

Investing Articles

How much do you need in a Stocks and Shares ISA to target £1,500 a month in passive income?

This writer shares how he’s working to turn his Stocks and Shares ISA into a source of passive income, harnessing…

Read more »

Surprised Black girl holding teddy bear toy on Christmas
Investing Articles

Will Rolls-Royce shares be the gift that keeps on giving in 2026?

It's been another superb year for anyone holding Rolls-Royce shares. But Paul Summers wonders if a hefty price tag will…

Read more »

A rear view of a female in a bright yellow coat walking along the historic street known as The Shambles in York, UK which is a popular tourist destination in this Yorkshire city.
Investing Articles

£5,000 invested in Glencore shares in January 2025 is now worth…

I’m building my 2026 ISA and Glencore shares keep pulling me back. One chart shows why the miner’s earnings mix…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

How much do you actually need in an ISA to target £2,500 per month in passive income?

Dr James Fox believes all Britons should be using their Stocks and Shares ISAs if they have to means to…

Read more »

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

Aviva shares are up 42% in 2025 – can they repeat it in 2026 and boost your ISA?

Aviva shares jumped in 2025 – I’m tracking them in my ISA to see if dividends and growth can keep…

Read more »

Emma Raducanu for Vodafone billboard animation at Piccadilly Circus, London
Investing Articles

Analysts reckon the Vodafone share price is on the money. But I’m not so sure

James Beard disagrees with the consensus view of analysts, which predicts little movement in the Vodafone share price over the…

Read more »