You won’t retire early with a Cash ISA. Here’s what I’d do instead

Forget the Cash ISA, says this Fool. Here’s how you can turbocharge your savings and increase your chances of retiring early.

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.

I’ve not had a Cash ISA for years and with good reason. Today I’ll explain why anyone even considering retiring early should steer clear of them.

The true cost of a Cash ISA

Any account that stops you from paying tax sounds great, in theory. In practice, however, the Cash ISA’s the worst destination of them all.

When even the best instant access account pays a measly 0.9%, any money stored here will barely rise in value, particularly when inflation is factored in. No, to have any chance of retiring early, your best bet is the stock market. 

Let’s say you have £10,000 and two options. Either you put this money in the Cash ISA, or you put it in a Stocks and Shares ISA. In the latter, let’s assume you invest every penny in a fund holding lots of big, global companies. It returns an average 10% per annum.

After 30 years, the first option will give you a little over £13,000. In the second, you’ll have £174,500! That’s the power of compound interest.

Sure, this example is simplified. Interest rates will vary over a 30-year period (although I can’t see them going up for a while). Average investment returns for the fund could be lower or higher and I’ve not taken into account any fees.  You also need to commit to not touching your money for a long time.

Nevertheless, this brief example shows how investing in stocks over a long timeline will give you a far better shot at retiring early than a Cash ISA ever will. 

Balancing the risk/reward ratio

Can I speed things up? Potentially, yes. The annual return in the example above is great but not exceptional. You can actually retire earlier (or retire after the same amount of time with a lot more money) if you outperform that hypothetical fund. There’s just one snag. To do this, you’ll probably need to take more risk with your capital. 

For me, this means looking lower down the market for smaller stocks that have the potential to be big winners. This requires time, energy, and, yes, a fair dollop of luck. Many minnows go bust, taking investors’ money with them.

That said, the potential returns are massive. Take a look at the share price of drug company Synairgen last week and you get an idea of just how much money can be made over a very short period of time. Now compare this to the Cash ISA interest rate.

A less-risky alternative to picking your own stocks would be to put your faith in a professional investor. To get your money’s worth, be sure to only back small-cap managers who’ve shown they can outperform the market most of the time (it’s very hard to do it every year).

If paying higher fees is something you don’t want to do, however, you could always invest in an exchange-traded fund that tracks small companies around the globe or within a specific country.  

Bottom line

Don’t dismiss early retirement as a pipe dream. Take advantage of the best wealth-generating mechanism out there: the stock market. The strategy for getting there may vary depending on how involved you want to be but even a simple approach can yield great results. 

Oh, and avoid the Cash ISA.

Paul Summers 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

Investing Articles

Is 2026 the year the Diageo share price bounces back?

Will next year be the start of a turnaround for the Diageo share price? Stephen Wright looks at a key…

Read more »

Investing Articles

Here’s my top FTSE 250 pick for 2026

UK investors looking for under-the-radar opportunities should check out the FTSE 250. And 2026 could be an exciting year for…

Read more »

Yellow number one sitting on blue background
Investing Articles

Here’s my number 1 passive income stock for 2026

Stephen Wright thinks a 5.5% dividend yield from a company with a strong competitive advantage is something passive income investors…

Read more »

Thoughtful man using his phone while riding on a train and looking through the window
Investing Articles

Should I sell my Scottish Mortgage shares in 2026?

After a strong run for Scottish Mortgage shares, our writer wonders if he should offload them to bank profits in…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

Down 35%! These 2 blue-chips are 2025’s big losers. But are they the best shares to buy in 2026?

Harvey Jones reckons he's found two of the best shares to buy for the year ahead, but he also acknowledges…

Read more »

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.
Investing Articles

State Pension worries? 3 investment trusts to target a £2.6m retirement fund

Royston Wild isn't worried about possible State Pension changes. Here he identifies three investment trusts to target a multi-million-pound portfolio.

Read more »

Smiling white woman holding iPhone with Airpods in ear
Dividend Shares

4 dirt-cheap dividend stocks to consider for 2026!

Discover four great dividend stocks that could deliver long-term passive income -- and why our writer Royston Wild thinks they’re…

Read more »

Young mixed-race woman jumping for joy in a park with confetti falling around her
Investing Articles

These fabulous 5 UK stocks doubled in 2025 – can they do it again next year?

These five UK stocks have more than doubled investors' money as the FTSE 100 surges. Harvey Jones wonders if they…

Read more »