We have some exciting news to share! The Motley Fool UK has now become The Twelfth Magpie -- an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. This site is our new home, and there will be extra tweaks made across the coming few days as we settle in. So if anything looks a little off, please bear with us!

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.

Turning a £20k ISA into a £16,000 annual second income? It’s possible!

By making the most of a £20k ISA using basic investing principles, our writer thinks he could build up to a second income of £16,000 a year.

| More on:
Front view photo of a woman using digital tablet in London

Image source: Getty Images

You’re reading a free article with opinions that may differ from The Twelfth Magpie’s Premium Investing Services. Become a member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn more, and get a free 'Best Buy Now' stock!.

I own shares in Legal & General (LSE: LGEN) as part of my second income strategy. The company ticks several key principal boxes I’ve outlined below. It’s a solid and reliable dividend payer with a 9% yield — considerably higher than the FTSE 100’s average of 3.5%.

However, the shares have disappointed me of late. Since early 2022, they’ve steadily declined from 307p to 231p. Possibly, high interest rates and stifling inflation bloated expenses and suppressed revenue. Naturally, this would limit capital available to the company for growth and reinvestment.

Should you buy Legal & General Group Plc shares today?

Before you decide, please take a moment to review this report first. Despite ongoing uncertainties from US tariffs to global conflicts, Mark Rogers and his team believe many UK shares still trade at substantial discounts, offering savvy investors plenty of potential opportunities to learn about.

That’s why this could be an ideal time to secure this valuable research – Mark’s analysts have scoured the markets to reveal 5 of his favourite long-term ‘Buys’. Please, don’t make any big decisions before seeing them.

Yet through it all it’s remained loyal to its shareholders, consistently increasing dividends since 2009. When aiming for passive income, that type of consistency is precisely what I look for. Of course, if the dwindling profits force the insurance giant to cut its dividends, I’ll reassess my position. 

But for now, it’s one of my best earners.

Screenshot from dividendsdata.co.uk

Now, a 9% yield’s at the high end of the scale. On average, I think a good portfolio could achieve a 7% yield and 5% annual price growth. With that, a monthly investment of £300 could grow to around £265,000 in two decades, paying an annual dividend of £16,740.

So how’s this type of portfolio constructed? Here’s my strategy.

Laying the groundwork 

To get the best tax savings, UK residents can invest up to $20k a year via a Stocks and Shares ISA. I believe strategic investing could turn this allowance into a significant second income over time.

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.

To aim for a consistent second income of £16,000 a year, I’ve considered some strategic investment ideas that leverage the full potential of my £20k ISA allowance. This plan involves a combination of regular contributions and smart portfolio management to achieve a sustainable passive income stream.

But bringing in an extra £16k a year isn’t easy. Here are the key investment principles I’d use.

Diversification 

I should just invest in stocks with the highest returns, right? Seems logical. However, these often come with the highest risk. A 30% gain one year could be a 40% loss the next. That’s why it’s best to spread an investment across various asset classes like stocks, bonds and ETFs. Some may have slower growth but can protect an investment when the economy inevitably dips.

Long-term focus

There’s no shortcut to a lucrative second income. It’s best to focus on long-term growth rather than short-term gains. This allows the investment to compound more over time.

Regular contributions

Making small contributions every month can maximise the ISA’s growth potential. This also defends against suffering a big loss by investing a large amount just before a market slump.

Reinvest dividends

As mentioned above, I’d add some stocks that pay dividends as they provide small amounts of regular income. By reinvesting the dividends, the returns will compound even quicker.

Consider index funds

These funds typically include a range of assets, offering an easy way to invest in a diversified portfolio. Some even track the performance of an entire index like the FTSE 100 or S&P 500.

Rebalancing

Markets change constantly due to economic, social and geopolitical events. Periodically reviewing and adjusting the assets in a portfolio can help to reduce risk and maximise returns.

Mark Hartley has positions in Legal & General Group Plc. The Motley Fool UK has no position in any of the shares mentioned. 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

Elevated view over city of London skyline
Investing Articles

With a 5.8% yield, how much is needed in a Stocks and Shares ISA for £1,000 of monthly passive income?

Muhammad Cheema looks at British Land and its 5.8% dividend yield. How many of its shares are needed in a…

Read more »

British coins and bank notes scattered on a surface
Investing Articles

Why are these FTSE 100 growth and dividend stocks so cheap?

Searching for the greatest FTSE 100 bargain stocks to buy? Royston Wild picks out two to consider with low PEG…

Read more »

many happy international football fans watching tv
Investing Articles

3 cheap FTSE 250 stocks to consider buying before the 2026 World Cup kicks off

With the World Cup less than a week away, our writer highlights a trio of UK stocks to consider buying.…

Read more »

Finger clicking a button marked 'Buy' on a keyboard
Investing Articles

I’m aggressively buying this S&P 500 growth stock for my ISA while it’s down 40%

This S&P 500 tech stock is well off its highs at the moment. But it may not be at depressed…

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

What on earth’s happening to the Barclays share price?

The Barclays share price has been jumping around of late and is up 11% in the past month. Ken Hall…

Read more »

A colourful firework display
Investing Articles

See what £12,000 in explosive JD Sports shares 1 month ago is worth today

After years of doom and gloom, JD sport shares are finally putting on a show. Harvey Jones examines how long…

Read more »

Businessman hand stacking money coins with virtual percentage icons
Investing Articles

The BP share price is on a knife edge – so where does it go next?

Harvey Jones exams why the BP share price has been surprisingly jumpy, even as the oil price spikes. Should investors…

Read more »

Wall Street sign in New York City
Investing Articles

Is the FTSE 100 at risk from an overheated US stock market?

Christopher Ruane explains why the UK market could suffer if its bigger US cousin sinks -- and why he's still…

Read more »