£12,000 in savings? Here’s why I’d aim for £31,377 a year in passive income with FTSE 100 dividend stocks

Our writer Royston Wild explains how he plans to use FTSE 100 dividend stocks to build a magnificent passive income.

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.

happy senior couple using a laptop in their living room to look at their financial budgets

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.

I’m convinced that buying UK shares is the best way to build long-term wealth. I myself have opened a Stocks and Shares ISA, an instrument that allows me to invest up to £20,000 in growth and dividend stocks without having to pay tax.

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.

Here’s how — thanks to the miracle of compound interest — I’m hoping I could turn this into a five-figure passive income once I retire.

Investing in the FTSE 100

For decades, UK shares have been a great way for average investors to make cash. The FTSE 100, for instance, has delivered an average annual return of 7.48% since it came into being 40 years ago.

If that annual average were to continue, I would, with an investment of £12,000 in Footsie stocks today, make a profit (excluding fees) of £897.60.

Over a 10-year period I would have made an impressive £8,976. This is far better than any savings account could have made me over that time.

But this is assuming that I withdrew my yearly gains as passive income to spend. With compounding, where I plough back any dividends I receive, I have an opportunity to make bigger (and potentially life-changing) returns.

With dividends reinvested, I could make an investment pot worth a whopping £25,294.45, as shown below.

Chart showing potential returns over a 10-year timeframe.
Created at thecalculatorsite.com

Compound gains

The beauty of compound interest allows me to make money on any dividends I reinvest as well as on my initial investment. And if I can afford to invest regularly after buying my first FTSE 100 shares, my eventual return could really take off.

Let’s say that I can purchase another £500 of Footsie stocks each month. That’s on top of the £12,000 I’ve already used to invest. I would have a huge £114,161.10 sitting in my account, as seen in the chart below.

Chart showing potential returns over a 10-year timeframe.
Created at thecalculatorsite.com

£31k+ passive income!

As I mentioned at the top, I’m buying shares to help me live comfortably when I retire. So I plan to continue investing in FTSE 100 stocks up until that point.

This is where things really get exciting. The principle compounding means that the longer I invest for, the greater sum of money I can expect once I stop.

If I invested that £500 a month for 30 years, I would have built up a pot of £783,417.49, assuming that 7.48% annual average stays the same.

Applying the 4% retirement drawdown rule — which would give me money for three decades before my investments run out — would provide me with a yearly passive income of £31,336.70.

A great way to invest

Of course past performance is no guarantee of future success. That average rate of return could well erode in the coming years thanks to company, industry, and macroeconomic factors.

But those figures above show what can be achieved. The growing number of Stocks and Shares ISA millionaires also underline what can be achieved by drawing up and sticking to an investment plan.

And the chances of successful investing today are improved thanks to the wealth of information available from experts like The Motley Fool.

Royston Wild has no position in any of the shares mentioned. 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

Tesla building with tesla logo and two teslas in front
Investing Articles

Why Tesla stock outperformed the S&P 500 — again — in 2025

As the Tesla share price shrugs off declining revenues and profits to climb 19%, what kind of further excitement will…

Read more »

Black woman using smartphone at home, watching stock charts.
Investing Articles

Thinking of investing in the stock market? Keep these basic rules in mind

Investing in the stock market can put investors on the fast track to building wealth and earning passive income. And…

Read more »

piggy bank, searching with binoculars
US Stock

This Dow Jones stock could be a dark horse outperformer for 2026

Jon Smith looks across the pond and spots a Dow Jones company that has fallen by 11% in the past…

Read more »

Investing Articles

Why Greggs shares crashed 40% in 2025

Greggs has more stores than it had a year ago and total sales are higher, so is a 40% discount…

Read more »

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

4 pros and cons of buying Lloyds shares in 2026!

Investors piled into Lloyds shares last year as the bank delivered strong trading numbers in tough conditions. Could the FTSE…

Read more »

Investing Articles

Prediction: AI stocks will rise again in 2026 and Nvidia’s share price will soar to this level

Can Nvidia and other AI stocks continue to perform in 2026? Edward Sheldon believes so. Here, he explains why he’s…

Read more »

Chalkboard representation of risk versus reward on a pair of scales
Investing Articles

3 S&P 500 growth stocks that could make index funds looks silly over the next 5 years

Edward Sheldon believes these three high-flying S&P 500 stocks have the potential to smash the market over the next five…

Read more »

Investing Articles

Here’s how to start building a passive income portfolio worth £2k a month in 2026

Dr James Fox believes there's never a better time to start a passive income ISA portfolio than today. Here's how…

Read more »