Share your opinion and earn yourself a free Motley Fool premium report!

We are looking for Fools to join a 75 minute online independent market research forum on 15th / 16th December.

To find out more and express your interest please click here

Turning an empty ISA into a £78,523 yearly second income!

As a UK resident, using the tax-efficient ISA makes it easy to generate wealth over the long run, and eventually turn it into a sizeable second 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.

Stack of one pound coins falling over

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.

Earning a second income is the holy grail of investing for many of us. And if that’s our goal, using the Stocks and Shares ISA might be the best way to go about it. The tax-efficient wrapper provides us with the opportunity to earn tax free-income. Here’s how I’d go about turning an empty ISA into a second income worth £78,523 a year.

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.

From humble beginnings

The Stocks and Shares ISA allows us to contribute up to £20,000 a year into our portfolio. But that’s a lot of money and, in reality, most of us don’t have that kind of cash lying around.

Instead, I can look to start with just small contributions, and it’s important to make these contributions regularly. Firstly, it’s a disciplined saving habit, but it also allows me to benefit more readily from pound-cost-averaging and the compounding of returns.

Just £200 a month, the equivalent of just £6.60 a day — cheaper than a pint at my local — could be enough to get me on the path to earning a significant second income in the long run.

Over the course of a year, that’s £2,400. Of course, that might not sound like much, but when invested over a long period of time, it can grow significantly.

However, first of all, I’ve got to open an ISA. My preference is for the Hargreaves Lansdown platform. It’s the UK’s number one investment platform and it’s very easy to use. But if I’m only investing smaller sums of cash, it may pay me to find a broker with lower fees.

Harnessing the power of exponential growth

One of the most impactful investment strategies is compound returns. This is the process of leaving my money invested for a long period of time and then earning interest on my interest.

Compound returns allow my investments to grow exponentially. As I earn returns on my initial investment, those returns are reinvested and start generating additional returns. Over time, this compounding effect accelerates the growth of my investments.

So how do I harness the power of exponential growth? I just keep reinvesting my returns. No strategy is a guaranteed winner, but compounding can magnify returns over time, enabling passive wealth generation.

I can hope to achieve anything up to 12% annualised growth as an investor on the FTSE 100. But a more realistic figure is between 8% and 10%. A dividend-heavy portfolio might deliver a little less, say 6-8%.

Here’s how big my second income could be by investing just £200 a month.

6% returns8% returns10% returns12% returns
5 years£734.44£1,025.39£1,342.92£1,689.41
10 years£1,827.89£2,703.30£3,758.25£5,029.22
20 years£5,292.21£8,927.49£14,270.65£22,119.31
30 years£11,595.18£22,742.95£42,728.13£78,523.20

I appreciate £78,523 in 30 years isn’t going to be worth what it is today. However, I suspect it’ll still be a sizeable income, and tax-free.

It’s also worth recognising that my £6.60 a day contribution will likely get easier over time. So I may well increase my contribution in line with inflation, or my salary development. This could also have a profound impact on my portfolio’s growth.

James Fox has positions in Hargreaves Lansdown Plc. The Motley Fool UK has recommended Hargreaves Lansdown 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

Businessman using pen drawing line for increasing arrow from 2024 to 2025
Investing Articles

£5,000 in Phoenix shares at the start of 2025 is now worth…

Phoenix Group shares charged ahead in 2025, with some analysts predicting even more explosive growth next year. But is it…

Read more »

High flying easyJet women bring daughters to work to inspire next generation of women in STEM
Investing Articles

Down 67%, is there any hope of a recovery for easyJet shares? Some analysts think so!

Mark Hartley looks for evidence to back analysts' expectations of a 28% gain for easyJet shares in 2026. Reality, or…

Read more »

Aviva logo on glass meeting room door
Investing Articles

£5,000 in Aviva shares at the start of 2025 is now worth…

Aviva shares have vastly outperformed the FTSE 100 since January, making them a fantastic investment this year. But can the…

Read more »

estate agent welcoming a couple to house viewing
Investing Articles

Just look at the amazing dividend forecast for Taylor Wimpey’s shares!

Taylor Wimpey’s shares are among the highest yielding on the FTSE 250. James Beard takes a look at the forecasts…

Read more »

Investing Articles

£5,000 invested in Vodafone shares at the start of 2025 is now worth…

Vodafone shares have been a market-beating investment in 2025, climbing by almost 50%! But is the FTSE 100 stock about…

Read more »

Investing Articles

Could the BP share price double in 2026?

The BP share price has shot up by over 30% since April, but could this momentum accelerate into 2026 and…

Read more »

Investing Articles

Could the BT share price surge by 100% in 2026?

The BT share price has started to rally as the telecoms business approaches a crucial inflection point that could see…

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

£10,000 in these income shares unlocks a £712 passive income overnight

These FTSE 100 income shares have some of the highest yields in the stock market that are backed by actual…

Read more »