How much passive income could I earn by investing £100 a month in UK shares?

With just a £100 monthly investment in UK dividend shares, I could achieve a decent passive income stream of over £13,000 a year.

| 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.

Young Caucasian woman with pink her studying from her laptop screen

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.

The idea of passive income is what first attracted me to investing. But what put me off was the impression that I needed a lot of money. It felt like there was no point in starting unless I had at least £10,000.

Now I realise the absurdity of that thought process. I could have started at any time with as little as £100 a month (or less). The key factor was time, not money. The sooner I began, the better. Looking back, I now see how much I could have been earning had I just put £100 a month into dividend stocks.

But which stocks are best?

Knowing what I know now, the first thing I’d have looked at was the dividend yields of popular FTSE 100 shares.

The table below shows the top five companies with the highest yields currently.

FTSE 100 Dividend yields
Data from dividenddata.co.uk

My initial reaction would be to invest in Phoenix Group, the highest-paying dividend stock. But will it stay that way?

Building passive income takes time, so I need to think long-term. Looking at its history, the company’s been paying a dividend since 2010 but, for much of that time, the yield was between 6% and 7%.

The volatility makes it unreliable. 

Next on the list, Vodafone, recently cut its dividend so it won’t be 10.34% for much longer. Until recently, British American Tobacco was only paying 6% and before 2018, it was only 3%. And M&G has only been paying a dividend for four years.

Which takes me to Legal & General (LSE: LGEN). L&G’s been paying a consistent and reliable dividend for 24 years. In that time, it’s steadily risen from 3% to 8%. When it comes to passive income, consistency and reliability are the key factors I’m looking for. 

Legal & General Group Dividend Yield History

Legal and General dividend data
Graph from dividenddata.co.uk

Yes, it’s had ups and downs so it might dip back below 7% for short periods. But in the long term, I’d expect it to keep growing.

Of course, there are some risks. Profit margins are down to 3.6% from 6.4% last year, so performance is slipping. I also see that earnings per share (EPS) is only 7p, while dividends are currently 20p. That makes the payout ratio well over 200%, meaning dividends could be cut if earnings don’t improve soon. And with a price-to-earnings (P/E) ratio more than double the industry average, the share price could be overvalued.

But it isn’t a growth share so that’s not unusual. The share price is only up 176% in the past 20 years. This equates to annualised returns of 5.22%, which is a fairly acceptable rate for an income share. 

Taking these figures into account and averaging a 2% annual yield increase, I can calculate my potential passive income. By reinvesting the dividends and compounding the returns over 10 years, my pot could grow to £23,642, paying annual dividends of £1,953.

If I continued investing £100 a month for a further 10 years, the total could grow to around £132,149, paying annual dividends of £13,700. That’s a decent £1,141 a month in passive income.

Of course, these are just projections based on the past performance of one stock. Ideally, I would diversify my investment over several reliable dividend stocks to safeguard against a single failure.

Mark Hartley has positions in Legal & General Group Plc. The Motley Fool UK has recommended British American Tobacco P.l.c., M&g Plc, and Vodafone Group Public. 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

Sunrise over Earth
Investing Articles

Meet the ex-penny share up 109% that has topped Rolls-Royce and Nvidia in 2025

The share price of this investment trust has gone from pennies to above £1 over the past couple of years.…

Read more »

House models and one with REIT - standing for real estate investment trust - written on it.
Investing Articles

1 of the FTSE 100’s most reliable dividend stocks for me to buy now?

With most dividend stocks with 6.5% yields, there's a problem with the underlying business. But LondonMetric Property is a rare…

Read more »

Investing Articles

Is 2026 the year to consider buying oil stocks?

The time to buy cyclical stocks is when they're out of fashion with investors. And that looks to be the…

Read more »

ISA coins
Investing Articles

3 reasons I’m skipping a Cash ISA in 2026

Putting money into a Cash ISA can feel safe. But in 2026 and beyond, that comfort could come at a…

Read more »

US Stock

I asked ChatGPT if the Tesla share price could outperform Nvidia in 2026, with this result!

Jon Smith considers the performance of the Tesla share price against Nvidia stock and compares his view for next year…

Read more »

Investing Articles

Greggs: is this FTSE 250 stock about to crash again in 2026?

After this FTSE 250 stock crashed in 2025, our writer wonders if it will do the same in 2026. Or…

Read more »

Investing Articles

7%+ yields! Here are 3 major UK dividend share forecasts for 2026 and beyond

Mark Hartley checks forecasts and considers the long-term passive income potential of three of the UK's most popular dividend shares.

Read more »

Hand is turning a dice and changes the direction of an arrow symbolizing that the value of an ETF (Exchange Traded Fund) is going up (or vice versa)
Investing Articles

2 top ETFs to consider for an ISA in 2026

Here are two very different ETFs -- one set to ride the global robotics boom, the other offering a juicy…

Read more »