Here’s how much I’d need to invest to make £500 extra income each month

Christopher Ruane walks through the process he could use to try and earn thousands of pounds annually in extra income by buying carefully chosen shares.

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.

Young mixed-race couple sat on the beach looking out over the sea

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.

One common way to earn some extra income is by investing in shares that can hopefully pay dividends.

I say hopefully as dividends are never guaranteed, even if a business has been a generous payer in the past (Direct Line is an example, having scrapped its shareholder payout this year).

But by carefully looking at the business health and share price valuation of some blue-chip companies I come across in everyday life, I hope I could earn some pretty meaty passive income.

Imagine my target was £500 each month on average. How much would I need to invest?

Calculating possible dividend income

There are two factors that determine how much I might earn in extra income from owning dividend shares: the size of my investment and the average dividend yield I earn on it.

For example, if I invest £100,000 at an average yield of 7%, that should earn me £7,000 annually in dividends. That is already more than my target, as £500 each month adds up to £6,000 in a year.

But yield is not fixed. It depends on the dividends paid out by a company in any given year, which, as explained above, can change for better or for worse.

Setting up a target

Still, dividend cuts rarely come from nowhere. Some businesses like Diageo and investment trusts like City of London have raised their payout annually for many decades already.

By finding high-quality, consistently profitable businesses with strong cash flows and healthy balance sheets, hopefully I can improve the chances that I may not only keep receiving the same dividends, but even see them grow as the years pass.

In any case, I would diversify my portfolio across a range of shares to reduce the overall impact of a dividend cut by any one company in which I invest.

With my target of £6,000 a year in extra income, at a 7% average yield, I would need to invest just under £86,000.

If I could earn a higher yield, that would let me hit my target while investing a smaller amount. I would never just chase yield, though. I always try to stick to high-quality companies I think have what it takes to pump out dividends year after year.

Building up bit by bit

Still, £86,000 is a lot of money. What if I had the same extra income goal – but no spare cash to invest?

I would simply put money regularly into a Stocks and Shares ISA or share-dealing account then compound (reinvest) my dividends.

Doing that with £500 a month at an average yield of 7%, I would hit my target in just over a decade, presuming for the sake of the example, that share prices and dividends are constant.

At that point, instead of putting £500 a month in, I could start taking £500 each month out as extra income!

C Ruane has no position in any of the shares mentioned. The Motley Fool UK has recommended Diageo 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

Group of young friends toasting each other with beers in a pub
Investing Articles

FTSE 100 shares: has a once-a-decade chance to build wealth ended?

The FTSE 100 index has had a strong 2025. But that doesn't mean there might not still be some bargain…

Read more »

Passive income text with pin graph chart on business table
Investing Articles

I asked ChatGPT for its top passive income ideas for 2026 and it said…

Stephen Wright is looking for passive income ideas for 2026. But can asking artificial intelligence for insights offer anything valuable?

Read more »

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

Here’s how a 10-share SIPP could combine both growth and income opportunities!

Juggling the prospects of growth and dividend income within one SIPP can take some effort. Our writer shares his thoughts…

Read more »

Tabletop model of a bear sat on desk in front of monitors showing stock charts
Investing Articles

The stock market might crash in 2026. Here’s why I’m not worried

When Michael Burry forecasts a crash, the stock market takes notice. But do long-term investors actually need to worry about…

Read more »

Person holding magnifying glass over important document, reading the small print
Investing Articles

Is this FTSE 250 retailer set for a dramatic recovery in 2026?

FTSE 250 retailer WH Smith is moving on from the accounting issues that have weighed on it in 2025. But…

Read more »

Young Black woman using a debit card at an ATM to withdraw money
Investing Articles

I’m racing to buy dirt cheap income stocks before it’s too late

Income stocks are set to have a terrific year in 2026 with multiple tailwinds supporting dividend growth. Here's what Zaven…

Read more »

ISA Individual Savings Account
Investing Articles

Aiming for a £1k passive income? Here’s how much you’d need in an ISA

Mark Hartley does the maths to calculate how much an investor would need in an ISA when aiming for a…

Read more »

Two business people sitting at cafe working on new project using laptop. Young businesswoman taking notes and businessman working on laptop computer.
Investing Articles

Is investing £5,000 enough to earn a £1,000 second income?

Want to start earning a second income in the stock market? Zaven Boyrazian breaks down how investors can aim to…

Read more »