I’d invest £10 a day in cheap FTSE 100 shares to aim for a million-pound ISA

The FTSE 100’s packed with top UK shares trading at low valuations. Now’s a brilliant time to start building long-term wealth.

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.

The FTSE 100 has fallen more than 9% since racing past 8,000 in February, and loads of shares look cheap right now. This presents a great opportunity for far-sighted investors to buy UK companies at reduced prices and build substantial long-term wealth. 

It’s good to aim high in life and it’s possible to build a million-pound portfolio using the annual Stocks and Shares ISA allowance, even with a relatively low initial commitment of £10 a day.

That may sound pie in the sky, but here’s how.

Making a million is possible

The last 20 years haven’t been great for the FTSE 100, but it’s still delivered an average total return of 6.89% a year. Over the long run, it’s closer to 8%, assuming dividends reinvested. Someone who invested their full annual £20,000 ISA allowance into a lead index tracker and generated 6.89% would be a millionaire in just under 22 years. 

If they chose their own stocks and generated a superior return of 9% a year, they’d get there roughly three years earlier.

Most of us can’t afford to put away £20k a year. Yet making a million is still doable with £10 a day, which works out at £3,650 a year. With 6.89% average growth, my calculations suggest it would take just over 35 years. I’d knock four years off that if I did some stock picking and generated a higher total return of 9% a year.

These figures also assume I increase my contribution by 5% a year to maintain its value against inflation. The obvious problem is that making a million in this way takes two or three decades. This is fine for investors in their 30s, not so good for late starters.

However, I think recent FTSE 100 underperformance gives me an opportunity to accelerate this timescale. That’s because a heap of terrific businesses are currently trading at large discounts to their intrinsic value.

Lots of big name blue-chips are now trading at between four and eight times earnings today. That’s well below the 15 times traditionally seen as fair value.

Better still, many yield as much as 8% or 9% a year. Even with modest share price growth, they could help me generate an average total annual return of 12%, or more. By using a Stocks and Shares ISA, there’s no tax to pay on the income or growth.

Buy and diversify

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.

As we’ve seen lately, UK shares can be volatile. Buying individual stocks may increase the potential rewards, but the risk rises too. I would get round this by building a diversified portfolio of shares across different FTSE 100 sectors.

Some of my cheap stock picks may turn out to be value traps that never recover their lost value. I’d therefore conduct due diligence to check growth prospects, earnings sustainability, competitor challenges and underlying problems, such as high net debt.

Now’s a great time to go shopping for cheap FTSE 100 shares, and I don’t want to waste it. Even if I never make that million, I should still end up richer than if I never try.

Harvey Jones 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

Sunrise over Earth
Investing Articles

Meet the ex-penny share up 109% that has topped Rolls-Royce and Nvidia in 2025

The share price of this investment trust has gone from pennies to above £1 over the past couple of years.…

Read more »

House models and one with REIT - standing for real estate investment trust - written on it.
Investing Articles

1 of the FTSE 100’s most reliable dividend stocks for me to buy now?

With most dividend stocks with 6.5% yields, there's a problem with the underlying business. But LondonMetric Property is a rare…

Read more »

Investing Articles

Is 2026 the year to consider buying oil stocks?

The time to buy cyclical stocks is when they're out of fashion with investors. And that looks to be the…

Read more »

ISA coins
Investing Articles

3 reasons I’m skipping a Cash ISA in 2026

Putting money into a Cash ISA can feel safe. But in 2026 and beyond, that comfort could come at a…

Read more »

US Stock

I asked ChatGPT if the Tesla share price could outperform Nvidia in 2026, with this result!

Jon Smith considers the performance of the Tesla share price against Nvidia stock and compares his view for next year…

Read more »

Investing Articles

Greggs: is this FTSE 250 stock about to crash again in 2026?

After this FTSE 250 stock crashed in 2025, our writer wonders if it will do the same in 2026. Or…

Read more »

Investing Articles

7%+ yields! Here are 3 major UK dividend share forecasts for 2026 and beyond

Mark Hartley checks forecasts and considers the long-term passive income potential of three of the UK's most popular dividend shares.

Read more »

Hand is turning a dice and changes the direction of an arrow symbolizing that the value of an ETF (Exchange Traded Fund) is going up (or vice versa)
Investing Articles

2 top ETFs to consider for an ISA in 2026

Here are two very different ETFs -- one set to ride the global robotics boom, the other offering a juicy…

Read more »