£10k in an ISA? Here’s how I’d target a regular £30k+ second income stream

Reliable dividends can help provide a lot more financial freedom. Here’s how I’d aim for a substantial second income inside an ISA account.

| 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.

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.

Close-up of a woman holding modern polymer ten, twenty and fifty pound notes.

Image source: Getty Images

It is becoming increasingly important to bolster one’s financial security, I’d argue. The cost of energy, food, and basic goods continues to rise. So a tax-free second income stream would certainly come in handy.

The good news is that this has never been easier to achieve in the stock market. Investing apps that don’t impose trading fees means I can get the ball rolling with as little as a couple of hundred quid.

Given this, a £10k lump sum is actually a large sum and more than most start out with in an ISA. And left alone, it could even produce decent returns without me contributing any more cash.

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.

Getting compound interest to work the right way

However, I wouldn’t leave the 10 grand alone. I’d instead supercharge the wealth-building process through buying stocks every month, come rain or shine.

Doing so would really fire up the affects of compounding. That is, interest earned upon interest, which is the fuel for wealth creation.

Compound interest can also be the foundation for wealth destruction too, as anyone who runs up huge credit card debt quickly realises.

Building up passive income

The amount of income generated will depend on the dividend yields of the stocks that I select.

Fortunately, the London Stock Exchange is the place to be today for high yields. Dozens of UK shares are carrying yields in excess of 6%.

So, let’s say I build a stock portfolio that collectively yields 6% every year, as well as generating 2% share price appreciation. That would give me an 8% average annual return.

If I was able to invest £800 a month on top of my original sum, I’d end up with £301,939 after just 15 years. Or an incredible £502,032 after 20 years.

Caveats

Now, this assumes I reinvest my cash dividends to buy more shares instead of spending them.

And it also assumes a steady 8% return every year, which isn’t how the stock market works (unfortunately). It goes up and down and dividends can be cut as well as increased.

However, 8% is the ballpark average total return for UK stocks over the long run. Therefore, I think it is realistic to aim for this, and potentially more as my skill level and experience increases over time.

A monopoly dividend stock I like

One steady income stock I hold in my portfolio is National Grid (LSE: NG.). It operates critical infrastructure for electricity transmission and gas distribution in the UK and northeastern US.

It primarily generates revenue by charging fees for the use of this infrastructure, including transmission lines and substations.

This gives the regulated company a natural monopoly status, which is perfect for predictable cash flows. And this translates into reliable dividends.

The dividend yield currently stands at 5.4%.

Naturally, there are risks here. One is the utility giant’s debt pile, which is growing as it invests billons in decarbonising the UK’s transmission network. This could put pressure on dividend increases in future.

Overall though, I prize the steady payouts that National Grid provides. And I reckon it is a solid FTSE 100 starter stock.

A £502,032 portfolio of such dividend shares yielding 6% would pay me a second income of £30,121.

Ben McPoland has positions in National Grid 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

Long-term vs short-term investing concept on a staircase
Investing Articles

As the stock market goes crazy, here’s a FTSE 250 share I’m thinking about buying

The stock market has officially gone haywire, with the FTSE 100 entering correction territory today. Here's what I've got my…

Read more »

Three signposts pointing in different directions, with 'Buy' 'Sell' and 'Hold' on
Investing Articles

Load up on cheap shares now – or wait to see whether they get even cheaper?

As the market fluctuates, some shares may suddenly look cheap. How an investor acts in such moments can affect their…

Read more »

Close-up of British bank notes
Investing Articles

Is this a once-in-a-decade opportunity to target a second income?

Looking to make a large second income from UK dividend shares? Now might be the opportunity you've been waiting for,…

Read more »

Front view of a young couple walking down terraced Street in Whitley Bay in the north-east of England they are heading into the town centre and deciding which shops to go to they are also holding hands and carrying bags over their shoulders.
Investing Articles

What on earth is going on with Barratt Redrow shares?

Barratt Redrow shares are the FTSE 100's biggest faller over the last month. What has been going on with the…

Read more »

Close-up of British bank notes
Investing Articles

This UK penny stock is tipped to double by City analysts!

What should we do when a favourite penny stock falls due to short-term pressures? Consider buying for the long term,…

Read more »

Calendar showing the date of 5th April on desk in a house
Investing Articles

£390 of income a week from a £20k Stocks and Shares ISA? Here’s how!

Christopher Ruane explains how someone with a £20k Stocks and Shares ISA and long-term timeframe could target hundreds of pounds…

Read more »

Abstract 3d arrows with rocket
Investing Articles

Up 25% YTD! Is this red-hot penny stock still ‘cheap’?

This penny stock has been on fire in 2026. Ken Hall takes a closer look at the investment story behind…

Read more »

Man smiling and working on laptop
Investing Articles

Stock market correction? A passive income opportunity!

Looking to turbocharge your passive income? The stock market correction could be a once-in-a-decade chance to do just that, says…

Read more »