Here’s how I’d turn a £20k ISA into passive income of almost £10k a year 

Investing in FTSE 100 shares is a great way to generate passive income, as they pay some of the highest dividends in the world.

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.

Middle-aged white man wearing glasses, staring into space over the top of his laptop in a coffee shop

Image source: Getty Images

I’m working hard to generate a passive income in retirement, on top of whatever the state pays me, and I think FTSE 100 dividend shares are the best way to do it. Now is a particularly good time to buy them, as share prices fall and yields rise as a result.

Investors are gloomy today as interest rates look set to stay higher for longer, and the Middle East burns. However, markets rarely stay down for long, so I’m buying shares today in the expectation that at some point they’ll bounce back.

So many shares to buy

If I had enough money to use up my full £20,000 Stocks and Shares ISA allowance this year, I’d be loading it up with UK blue chips.

I’d target dirt-cheap dividend shares like insurer Aviva, mining giant Rio Tinto, and wealth manager M&G. They currently yield 7.81%, 8.22%, and 10.14%, respectively. This level of income absolutely smashes cash, plus there’s potential for share price growth when stock markets finally recover.

Dividends are more rewarding than savings accounts but also riskier. If the company cannot maintain profits and cash flows, it may be forced to slash shareholder payouts or abandon them altogether. I’d reduce the risks by building a diversified portfolio of around 15 FTSE 100 shares, across a range of different sectors.

With luck, my dividend income will steadily rise over time, as companies look to increase their dividends and keep shareholders happy.

I reckon it’s possible to generate a passive income stream of around £10,000 a year, from my initial £20k. I’ll have to be patient though.

I only ever buy shares with a minimum 10-year view. By holding for the long term, I can withstand short-term market volatility, and give my reinvested dividends plenty of time to compound and grow. Later, when I retire, I will draw them as a second income.

The FTSE 100 has delivered an average total return of 8% a year since the 1980s. If my portfolio matches that, in 25 years my £20k will have grown to a pretty nifty £136,970. 

When to start? Today

If my shares yield an average of 7% at the time, that would give me income of £9,588 a year. Not bad considering I only invested £20k.

These sums are a bit rough and ready. My hand-picked portfolio could grow slower than 8% a year so I’d end up with less. Alternatively, my stock picks could outperform. That 7% yield isn’t guaranteed, either.

Another risk is that the stock market crashes just before I retire, reducing the size of my pot. But history shows that in the long run, equities usually outperform cash. Whatever happens, I think the underlying argument holds good: building a portfolio of income paying shares is a great way to fund my retirement.

The longer I can leave my ISA invested, the more time it has to growth. So I won’t waste time, and I’ll start building tomorrow’s passive income stream today.

Harvey Jones has positions in M&G Plc and Rio Tinto Group. The Motley Fool UK has recommended M&G 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

Lady wearing a head scarf looks over pages on company financials
Investing Articles

Is April a good time to start buying shares?

Wondering whether now's a good time to start buying shares to build wealth? History suggests it is, says Edward Sheldon.

Read more »

A senior group of friends enjoying rowing on the River Derwent
Investing Articles

How much passive income could a Stocks and Shares ISA pump out every year?

Regular investing inside a Stocks and Shares ISA could lead to the equivalent of £141 a week in tax-free passive…

Read more »

Fans of Warren Buffett taking his photo
Investing Articles

With the FTSE 100 down 5%+ investors should remember this legendary quote from Warren Buffett

Warren Buffett is widely regarded as the greatest investor of all time. And he says that the best time to…

Read more »

Inflation in newspapers
Investing Articles

1 FTSE 100 stock that could benefit from higher inflation

For most companies, inflation is a risk. But for one FTSE 100 firm, higher input costs could be an opportunity…

Read more »

Man hanging in the balance over a log at seaside in Scotland
Investing Articles

The 2026 stock market sell-off could be a rare opportunity to build wealth in an ISA

The recent stock market sell-off has led to some shares falling 20% or more. This could be a great opportunity…

Read more »

Thoughtful man using his phone while riding on a train and looking through the window
Investing Articles

It’s down another 13%! Analysts were dead wrong about the Greggs share price

The Greggs share price continues to fall and analysts have been revising their share price targets down further. Dr James…

Read more »

Burst your bubble thumbtack and balloon background
Investing Articles

Is the stock market about to reach breaking point?

Private credit has a problem with the emergence of artificial intelligence. And it could be set to create issues across…

Read more »

BUY AND HOLD spelled in letters on top of a pile of books. Alongside is a piggy bank in glasses. Buy and hold is a popular long term stock and shares strategy.
Investing Articles

A once-in-a-decade chance to buy this S&P 500 stock?

As investors focus on oil prices and the conflict in Iran, Stephen Wright's looking at potential opportunities in the S&P…

Read more »