Can I turn an empty ISA into £22,000 of tax-free annual passive income?

We’d all love a passive income. But is it possible to generate one starting with nothing? Dr James Fox explains how it could be done.

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.

British bank notes and coins

Image source: Getty Images

Creating passive income by investing in stocks is simple. It may not seem that way when starting with nothing, but it’s entirely possible to turn an empty portfolio into one that generates substantial sums of passive income.

Starting with nothing

To begin, I need to open an account. This can be done through numerous brokers like Hargreaves Lansdown, and we’ll want to use a Stocks & Shares ISA if we haven’t already.

Next, if I’m starting without existing capital, I need to recognise that I’ll need to make regular contributions to my account. In an ideal world, I’ll be saving monthly.

Then I should adopt an investment strategy aligned with income goals and risk tolerance. This may encompass diversifying my portfolio by investing in stocks, bonds, or funds.

Discipline

Now I’m not going to turn an empty portfolio into a huge pot overnight. I need to recognise that it’s going to take time.

If I’m comfortable saving £200 a month, it will take a number of years and constant reinvestment for my portfolio to grow accordingly.

As such, navigating this path necessitates a disciplined mindset coupled with consistent and periodic savings practices.

Compounding

Compounding isn’t the sexiest topic in investing, but it’s how portfolios grow over the long run. It’s also how investors like Warren Buffett became so rich.

My wealth has come from a combination of living in America, some lucky genes, and compound interest,” Buffett famously once said.

Compound returns come into play when I reinvest my earnings annually. This enables me to earn interest not only on my initial contributions but also on the interest I’ve already earned.

In turn, this creates exponential growth, much like a snowball gathering more snow and expanding as it rolls downhill.

As a result, the longer I invest, the quicker my investment grows. With its increasing size, I can expect to receive more interest in the form of dividends.

Using the ISA

One of the primary advantages of a Stocks & Shares ISA is that any capital gains or dividends I earn from investments within the ISA are tax-free.

This means if my investments appreciate in value, I won’t have to pay capital gains tax when I sell them, regardless of the amount of profit I make.

Likewise, as I’m investing passive income in the long run, I won’t have to declare my dividend income.

But even seasoned investors get it wrong. And I must be aware that I could lose money if I make poor investment decisions.

Bringing it all together

Let’s assume I’m saving £200 a month. And as noted, I’m reinvesting my returns every year to benefit from compound returns and, over the course of my investment, I annualise 8% returns. here’s what could happen.

Years investedSize of portfolio
5 years£14,695
10 years£36,589
20 years£117,804
30 years£298,071

At any point within this investment journey, I could stop reinvesting and start taking. But the longer I’ll leave it, the faster it’ll grow. Just take a look at this chart below. And in terms of passive income, after 30 years, my portfolio could be generating £22,000 a year. Even taking into account inflation, that’s not a bad passive income source.

Created at thecalculatorsite.com

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

British pound data
Investing Articles

The red lights are flashing again for Lloyds’ share price! Here’s why

Lloyds' share price continues to defy gravity. But Royston Wild thinks it's only a matter of time before the FTSE…

Read more »

Aston Martin DBX - rear pic of trunk
Investing Articles

Aston Martin shares are now only 41p!

Aston Martin shares just dropped to around the 41p mark! Is this a brilliant buying opportunity or a stock that…

Read more »

Artillery rocket system aimed to the sky and soldiers at sunset.
Investing Articles

Up 325% in 5 years! But are BAE System shares still a no-brainer buy?

BAE Systems shares would have been a brilliant buy five years ago. But could they still offer excellent returns if…

Read more »

Investing Articles

How much do you need to invest each month into FTSE 100 shares to aim for a million?

Simply by putting a few hundred pounds a month into FTSE 100 shares, how might someone aim to become a…

Read more »

Close-up as a woman counts out modern British banknotes.
Investing Articles

£10,000 invested in BAE shares at the beginning of 2026 is now worth…

Paul Summers tips his hat to those who invested in BAE Systems shares when markets opened back up in January.…

Read more »

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.
Investing Articles

What size ISA do you need for £250-a-week retirement income?

Harvey Jones outlines the advantages of investing in a Stocks and Shares ISA rather than leaving money in cash, and…

Read more »

Mature Caucasian woman sat at a table with coffee and laptop while making notes on paper
Investing Articles

£5,000 invested in Legal & General shares 5 years ago is now worth…

Harvey Jones crunches the numbers to show how much an investor would have earned from Legal & General shares lately,…

Read more »

Investing Articles

Just check out the latest bumper forecasts for Lloyds, NatWest and Barclays shares

Harvey Jones says Barclays shares have had a terrific year and there could be more action to come. So what's…

Read more »