How I’d invest £100 a month in UK shares to target a £12,323 second income

I’d take advantage of this rare opportunity right now in the UK markets to target a sizeable and lifelong second income. Here’s how.

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.

Union Jack flag triangular bunting hanging in a street

Image source: Getty Images

Where’s the best place to invest for a second income? Well, compared to their US and European peers, UK shares trade at a staggering discount right now. 

One estimate from Liberum put the discount at 25% for European stocks and 30% for US stocks. Looking purely at earnings, stocks across the pond cost twice as much. 

Why are shares here so cheap? Well, it’s a messy topic, but UK shares flatlining since 2017 shows a mismanaged post-Brexit transition might have something to do with it.

The good news is these conditions are perfect for bargain hunters. By taking advantage of discounted UK stocks, I could aim to turn £100 a month into a £12,323 yearly second income. Here are the three steps I’d take today to achieve that. 

Save money

The first one? Save some money. I’m hoping to have £100 left at the end of the month for investing. That’s nothing to sniff at in a cost-of-living crisis where the cost of food and other essentials has gone through the roof.

But even if I manage to carve that out my budget, it doesn’t add up quickly. Even 30 years of diligent saving of £100 a month only gives me a cash sum of £36,000. 

£100 a month
1 year£1,200
5 years£6,000
10 years£12,000
20 years£24,000
30 years£36,000

Of course, that is quite a lot of money, but without a consistent return then it won’t be useful for income. For this, I’m looking to underpriced UK shares to accelerate my earning power. 

Invest

So my second step is to invest. The London Stock Exchange offers thousands of companies for me to choose from and, despite a recent lean period, the historical return for shares in this country comfortably beats most of the globe.

How much would I receive? Well, that’s not an easy question to answer. The stocks I invest in have a huge effect, and if I get it wrong, I could end up with subpar returns or even lose money. 

But if I can use the current market bearishness to snaffle up shares on the cheap, I might target a 12% yearly return.

Collect

My final step is to invest through a Stocks and Shares ISA or a SIPP. These accounts let me buy into companies and avoid punishing taxes on dividends or capital gains. With a £20k maximum deposit a year on the ISA, I could feasibly go my entire investing career without sending a single penny to the taxman. 

Please note that tax treatment depends on the individual circumstances of each client and may be subject to change in future. The content in this article is provided for information purposes only. It is not intended to be, neither does it constitute, any form of tax advice. Readers are responsible for carrying out their own due diligence and for obtaining professional advice before making any investment decisions.

So let’s put this together then. Here’s what my £100 a month in UK shares could turn into:

£100 a month
12%
1 year£1,277
5 years£8,110
10 years£22,404
20 years£91,986
30 years£308,097

Now, my final sum of £308,097 can be withdrawn at 4% a year to hand me a £12,323 second income. An income stream so high would give me financial security and may be used to top up a pension or help me retire earlier. 

The 4% amount is key. By withdrawing less than the average returns, my original sum will likely stay intact. That gives me a big rainy day fund or something to leave behind for loved ones as well.

John Fieldsend 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

Black woman using loudspeaker to be heard
Investing Articles

A SIPP opened at birth could be worth £10m in 55 years

The SIPP is an incredible vehicle for building wealth and saving for retirement. Many Britons just don't realise how early…

Read more »

Young Caucasian woman at the street withdrawing money at the ATM
Investing Articles

2 passive income ideas for a Stocks and Shares ISA

Looking for passive income stocks in April? Here are two high-quality FTSE 250 dividend shares to consider buying for an…

Read more »

Front view of aircraft in flight.
Investing Articles

£5,000 invested in Wizz Air shares 2 days ago is now worth…

This week has been a rather good one for beaten-down Wizz Air shares. What would have happened to a £5,000…

Read more »

Road trip. Father and son travelling together by car
Investing Articles

How much do you need in an ISA for £1,000 a week in passive income?

Ben McPoland highlights a FTSE 250 stock down by more than 25% that offers good value and an attractive 5.5%…

Read more »

A row of satellite radars at night
Investing Articles

Is Elon Musk about to send this FTSE 100 stock into orbit?

This year is shaping up to be a big one for this FTSE 100 stock and part of the reason…

Read more »

Petrochemical engineer working at night with digital tablet inside oil and gas refinery plant
Investing Articles

Up 50% in a month! Meet Quadrise, the soaring UK penny stock that offers an alternative to oil

Mark Hartley takes a closer look at a British penny stock that envisions a future less dependent on crude oil.…

Read more »

Senior couple crossing the road on a city street. They are walking with shopping bags while Christmas shopping.
Investing Articles

How much do I need in a SIPP for a £500 monthly passive income?

Looking to earn a reliable passive income from your SIPP? Royston Wild explains how this could be possible with some…

Read more »

Hand of person putting wood cube block with word VALUE on wooden table
Investing Articles

A P/E ratio of less than 7. Is this a red-hot value share to consider now?

James Beard uses a popular tool to identify a UK share that’s potentially undervalued. But he reckons judgement is also…

Read more »