Forget the Cash ISA! I’d invest in bargain FTSE 100 shares to get rich and retire early

The Cash ISA sucks. There, I said it. Even the very best rates for locking up my cash are less than inflation! I’d ditch that and do this instead.

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 Cash ISA is a total waste of time, in my opinion. It has little value for creating long-term retirement wealth. Instead, I believe that building up a balanced portfolio of bargain FTSE 100 shares will help me get rich and retire early. That’s especially true if I invest now, when so many FTSE 100 shares are available at attractive valuations. 

Investing to get rich(er) and hopefully to retire early is my lifetime’s work. As I’m now in my 40s, that means I’ve got a good 30 years to use wisely. 

My plan is to ignore the short-term share price movements that make some investors panic-buy or sell. Instead, I’m expanding my thinking to consider a much longer time period. 

Cash ISA = useless

Because UK interest rates are at historic lows at the moment, it’s really difficult for savers to see any kind of return on their cash. I’ve been shopping around while researching this article and I’ve found some pretty shocking numbers. 

Yes, it’s true that savers don’t pay tax on any money they hold in a Cash ISA, and that a Cash ISA is available for anyone over the age of 16. And that everyone gets an allowance of £20,000 to put away in a Cash ISA each tax year. 

But I don’t see why anyone would bother. 

Fixing the Cash ISA

A fixed-rate Cash ISA normally pays a tiny percentage more than easy-access, as a way to compensate savers for locking up their cash for longer. 

But even the market-leading three-year Cash ISA pays a miserly 0.8% interest. On a huge, maximum balance of £20,000 that means I’d get £160 a year. That 0.8% is also below the current rate of UK inflation. So I’d actually be losing money every year I kept it there.

And if I needed to get my hands on that cash sooner than I thought? I’d have to pay a whopping penalty for each withdrawal of up to a year’s interest payments. 

By law, Cash ISA providers have to offer me access to my own money. But most fixed-rate providers would force savers to close their whole account to get it. So it should be clear why this isn’t my preferred way to get rich and retire early.  

Go FTSE 100 shares instead

By contrast, I’m already making a much better rate of return from cheap FTSE 100 shares that offer dividend income.

I’ve only been investing properly for a couple of years, in truth. By properly, I mean doing serious research into good, profitable companies. I only tend to pick the ones I think have a decent shout at remaining in business for decades to come.  

That’s because the power of compound growth comes into its own when it is left to work for 10 years or more. UK investors can access compound growth by reinvesting any dividends from cheap FTSE 100 shares. This is a simple tick box in most Stocks and Shares ISA accounts. 

 So I’d never recommend a Cash ISA, no matter what age my readers are. Instead I stick with quality blue-chip shares and I’ve not gone far wrong yet. 

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

DIVIDEND YIELD text written on a notebook with chart
Investing Articles

A 9% dividend yield! 1 dirt-cheap FTSE 100 passive income gem to snap up today?

This FTSE stock offers huge passive income, looks deeply undervalued, and has strong forecast earnings growth -- making it too…

Read more »

Thoughtful man using his phone while riding on a train and looking through the window
Growth Shares

What are the best growth shares to try and double your money?

Jon Smith points out several key characteristics of growth shares to differentiate the good from the bad, and highlights one…

Read more »

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

I asked ChatGPT for the best FTSE 100 stock for total returns in 2026, and guess what it said…

Are AI chatbots any better than humans at digging out the best value FTSE 100 stocks to consider buying? They…

Read more »

UK money in a Jar on a background
Investing Articles

How much should someone invest to target a £100 weekly second income?

Bringing in a second income can spell the difference between comfort or crisis when an emergency happens. Mark Hartley breaks…

Read more »

Emma Raducanu for Vodafone billboard animation at Piccadilly Circus, London
Investing Articles

Is now the time to consider buying Vodafone shares?

Vodafone shares have been on a roll, transforming a £5,000 investment 12 months ago into £8,455 today. But is the…

Read more »

Female Tesco employee holding produce crate
Investing Articles

Is now the time to consider buying Tesco shares?

Tesco shares have been a stellar performer over the last 12 months, but can this momentum continue? Or is it…

Read more »

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

Is this the perfect time to consider buying Legal & General shares?

Legal & General shares have one of the FTSE 100's biggest forecast dividend yields for 2026. Maybe we should think…

Read more »

Passive income text with pin graph chart on business table
Investing Articles

These are the FTSE 100’s 5 biggest passive-income streams!

These five FTSE 100 firms are expected to pay out £30.5bn in cash dividends in 2026. I'm a huge fan…

Read more »