£1,000 a month in passive income? Here’s how investors could start with a £20k ISA

Our writer thinks investing in FTSE 100 dividend shares with a £20k ISA could lead to a stable passive income stream down the road.

| 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.

Businessman hand stacking up arrow on wooden block cubes

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.

Trying to pick through all the odd and improbably passive income ideas can be difficult. Rather than try something risky, savvy investors prefer to focus on a tried-and-tested approach.

For decades, British investors have sworn by the regular income that leading dividend stocks deliver. With the FTSE 100 average yield at around 3.5%, the index promises more lucrative dividend income than its US peers.

With a Stocks and Shares ISA, UK residents can invest up to £20k a year with no tax levied on the capital gains. These self-directed investment accounts allow the holder to pick from a wide variety of assets, including stocks, commodities and investment trusts.  

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.

Growing over time

By picking a mix of high-yield stocks, many UK investors have managed to achieve an average yield of around 6%. That would pay only £1,200 a year in dividends on £20k. 

By investing the full £20k each year, within eight years, the pot would reach $231,000 (with dividends reinvested). That would pay £12,000 a year in dividends, or £1,000 a month.

Of course, £20k’s a lot to save every year. But even at half that amount (£10k a year) the same dividend income could be achieved in 12 years.

Choosing stocks

A general rule of thumb dictates that a mix of around 10 stocks provides sufficient diversity in a portfolio. Rather than simply pick the highest-yielding shares, many investors also include some defensive shares or index trackers.

These can help keep a portfolio stable during volatile economic periods. Some defensive stocks also pay a decent dividend, for example, Unilever, with a 3.3% yield, or GSK, at 4.5%.

Naturally, these lower-yielding shares would need to be offset by higher ones to achieve a good average. But very high yields can be indicative of financial problems so it’s critical to dig deeper.

One example

That’s why I like Aviva (LSE: AV). It may have a lower yield than other UK insurers but has a long payment history. I also think it achieves a good balance of allocating funds between the business and dividends.

Looking back, the company has cut dividends several times. This may look bad until you consider how it has used these savings to improve operations. That may be why the share price is up 17.4% in the past five years. Many other UK insurance companies are negative over the same period.

Of course, that doesn’t mean it’s without risk. Like most insurers, Aviva invests in fixed-income securities which are impacted by interest rates. If interest rates fall, it could hurt the company’s bottom line. In the highly competitive UK insurance landscape, it can’t risk losing market share failing to impress customers.

But I think it looks to be in a good position. It surprised analysts in its 2024 first-half results, with earnings coming in 10% higher than expectations. Revenue is now expected to exceed £39bn for the year, considerably higher than the £27.4bn achieved in 2023.

I hold the shares as part of my income portfolio and will continue to drip-feed the investment throughout 2025.

Mark Hartley has positions in Aviva Plc, GSK, and Unilever. The Motley Fool UK has recommended GSK and Unilever. 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

ChatGPT thinks these are the 5 best FTSE stocks to consider buying for 2026!

Can the AI bot come up trumps when asked to select the best FTSE stocks to buy as we enter…

Read more »

Investing For Beginners

How much do you need in an ISA to make the average UK salary in passive income?

Jon Smith runs through how an ISA can help to yield substantial income for a patient long-term investor, and includes…

Read more »

Investing Articles

3 FTSE 250 shares to consider for income, growth, and value in 2026!

As the dawn of a new year in the stock market approaches, our writer eyes a trio of FTSE 250…

Read more »

Warren Buffett at a Berkshire Hathaway AGM
Investing Articles

Want to be a hit in the stock market? Here are 3 things super-successful investors do

Dreaming of strong performance when investing in the stock market? Christopher Ruane shares a trio of approaches used by some…

Read more »

Two white male workmen working on site at an oil rig
Investing Articles

The BP share price has been on a roller coaster, but where will it go next?

Analysts remain upbeat about 2026 prospects for the BP share price, even as an oil glut threatens and the price…

Read more »

Investing Articles

Prediction: move over Rolls-Royce, the BAE share price could climb another 45% in 2026

The BAE Systems share price has had a cracking run in 2025, but might the optimism be starting to slip…

Read more »

Tesla car at super charger station
Investing Articles

Will 2026 be make-or-break for the Tesla share price?

So what about the Tesla share price: does it indicate a long-term must-buy tech marvel, or a money pit for…

Read more »

Portrait of elderly man wearing white denim shirt and glasses looking up with hand on chin. Thoughtful senior entrepreneur, studio shot against grey background.
Investing Articles

Apple CEO Tim Cook just put $3m into this S&P 500 stock! Time to buy?

One household-name S&P 500 stock has crashed 65% inside five years. Yet Apple's billionaire CEO sees value and has been…

Read more »