Here’s how I’d aim for a ton of passive income from £20k in an ISA

To get the best passive income from an ISA, I think we need to balance risk with the potential rewards. Here’s one way to go about it.

| 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.

ISA coins

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.

It’s spring, and investors’ thoughts are turning to passive income. And what better way than with our new ISA contribution limit of £20,000?

We could go for a Cash ISA, and some of those pay around 5% these days. And it’s guaranteed, at least for the duration of the deal.

But interest can’t stay that high when the Bank of England starts cutting base rates, can it?

Risk and reward

As with so many things in life, we have to balance risk and reward.

Over the long term, the UK stock market has beaten other forms of investment. But it’s had bad spells, like the past decade.

There are ways we can reduce risk though.

One way is what I think of as playing the percentage shots. Using a term from sport, if we play the shots that are more likely to be modestly successful rather than going for the riskier glory chances, we can stand a better chance of coming out ahead in the long term.

Let’s compare a couple of UK stocks.

Big dividend

Vodafone (LSE: VOD) has been paying some of the FTSE 100‘s biggest dividends. We’re talking serious money here, with yields above 10%. And if that’s not a great route to passive income, what is?

Well, Vodafone hasn’t been taking home the earnings to cover the dividends. Investors can see that. And a big sell-off over the past 10 years has seen the share price slump by 74%.

What’s the point of big dividends if we lose the bulk of our initial stake?

Oh, and Vodafone will slash its dividend in 2025, though shareholders should get one final 10% for 2024.

Still, it’s part of Vodafone’s refocus, and I do think the stock could have a good future now. But back to my point…

Steady income

Let’s compare that with a stock I rate as possibly the most reliable dividend payer in the FTSE 100. I’m talking of National Grid (LSE: NG.), with a forecast 5.4% dividend for 2024.

It’s not the biggest. But it’s increased for more than 25 years now. And in the past 10 years, the share price has gained 19%.

That’s not big growth. But it’s a few points ahead of the Footsie, which I think is fine in the decade we’ve had.

National Grid faces a reduction in gas distribution. And it’s in a regulated industry where minimum investment is often mandated. So it’s not without risk, and the dividend is far from guaranteed.

Percentage shot

But I rate it as the percentage shot, while Vodafone was the glory shot.

Still, I reckon we can do better than a 5.4% return. But we do need to lift the risk a bit. By spreading my ISA cash across a diversified range of dividend stocks, I expect I could snag 7% per year.

A whole ISA allowance invested at that rate could compound to more than £75,000 in 20 years. And then that could pay £6,800 a year in passive income.

Or someone who can stash away the full £20k each year could build more than £850k, for a £60k annual passive income.

Alan Oscroft has no position in any of the shares mentioned. The Motley Fool UK has recommended 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

Investing Articles

Lloyds’ shares are doing great… but these two banks could outperform in 2026

Dr James Fox holds Lloyds' shares and has done for some time. However, his attention is being drawn towards two…

Read more »

Investing Articles

How much would I need in an ISA to earn a £1,667 monthly second income?

Andrew Mackie crunches the numbers on a £20,000-a-year second income ISA – and finds it’s far more achievable than most…

Read more »

Investing Articles

Both the Lloyds and Vodafone share prices have risen above 100p. But could they move higher still in 2026?

It was a close-run race but the Vodafone share price has beaten Lloyds’ to get back to £1. James Beard…

Read more »

UK financial background: share prices and stock graph overlaid on an image of the Union Jack
Investing Articles

2 FTSE 100 shares I believe could plummet in value in 2026!

FTSE 100 shares rose at their fastest pace since after the Great Financial Crisis last year. It's an ascent that…

Read more »

A rear view of a female in a bright yellow coat walking along the historic street known as The Shambles in York, UK which is a popular tourist destination in this Yorkshire city.
Investing Articles

Can you build a million-pound ISA with FTSE 100 shares?

Fancy becoming a Stocks and Shares ISA millionaire? Of course you do. Royston Wild considers whether buying FTSE shares is…

Read more »

Young black colleagues high-fiving each other at work
Investing Articles

Will 2026 be the year of the ISA stock market millionaire?

Discover why a drop in Cash ISA allowances could supercharge the number of stock market millionaires in the UK from…

Read more »

Investing Articles

In 2026, investing £5,000 in a Stocks and Shares ISA could be worth…

Here’s how much money investors could make this year by investing £5,000 in UK stocks, and which sectors looked primed…

Read more »

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

Down 20%, I’ve just bought this battered growth stock! Have I messed up?

Discover which FTSE 250 growth stock I've just bought for my Self-Invested Personal Pension (SIPP) -- and why I believe…

Read more »