The 3 steps to becoming an ISA millionaire

It is easy to become an ISA millionaire if you know how.

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 new tax year begins on April 6, which means that from today, you have less than two weeks to make the most of your £20,000 tax-free savings allowance for the year. 

Maxing out your annual ISA allowance is a good idea if you can afford to do it. Indeed, if you can put away £20,000 for 25 years, assuming a conservative rate of return of 5% per annum, you could become an ISA millionaire

And even if you can’t afford to use all of your ISA limit, you could still reach the landmark £1m figure by following three simple steps. 

Three steps to a million

The first step on the road to a million is to start saving as soon as possible on a regular basis. 

The sooner you start saving, the better. For example, if you start at age 40 putting away £100 a month and earning 2% per year, with the goal of retiring at 65, you will have £38,946 at retirement. However, if you start saving £100 per month at 20 years of age, at a rate of 2%, you will have built a pot of £87,611 by the time of retirement with no extra effort on your part. This is why it’s essential to make as much use of your ISA as possible every year.

The power of time is just one tool you have available to you to improve your long term returns. 

If you want to make your money work as hard as possible for you, it’s vital that you invest. The great thing is that today, you don’t have to put any effort at all into investing your money. The FTSE 250 has produced a total return of around 9% per annum for the past decade, extrapolated over 45 years, as in the example above, this rate of return is enough to turn just £100 a month into £729,120. Or, if you save for only 25 years, £111,700.

A basket of high-quality stocks, such as UnileverDiageo and AstraZeneca could help you achieve similar returns. 

If you’re saving regularly and investing, the final step you need to take is to minimise costs. Many investors don’t realise high costs are one of the most common reasons why they struggle even to match market returns. With this being the case, it’s essential you keep an eye on what you’re paying out in fees. 

Currently, the lowest cost FTSE 250 tracker fund charges investors only 0.09% per annum in fees. Meanwhile, the average change for an actively managed fund today is 0.9%. That’s 10 times higher. If I plug this into the above example: £100 a month, invested at a rate of 9% per annum, with a cost of 0.09%, will be worth £679,930 at age 65. On the other hand, if you pay out 0.9% per annum in fees, the pot will only be worth £525,055 at age 65, that’s a difference of £154,875!

Foolish summary 

These examples illustrate how easy it is to build a fortune if you follow just a few critical steps. You don’t need to spend thousands on advisors or start off with an extensive portfolio, as long as you save regularly, invest sensibly and keep costs low, over time, your pot will grow. 

Rupert Hargreaves owns shares in Unilever. The Motley Fool UK owns shares of and has recommended Unilever. The Motley Fool UK has recommended AstraZeneca and Diageo. 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

Night Takeoff Of The American Space Shuttle
Investing Articles

Should I buy Nasdaq stock Micron for my ISA after blowout Q2 earnings?

Nasdaq tech stock Micron is generating incredible revenue growth at the moment amid the AI boom. Yet it still looks…

Read more »

Hand flipping wooden cubes for change wording" Panic" to " Calm".
Investing Articles

Is it time to dump my shares ahead of an almighty stock market crash? Nah!

How should we cope with growing fears of a stock market crash? 'Keep Calm and Carry On' worked in 1939,…

Read more »

Business man pointing at 'Sell' sign
Investing Articles

As the FTSE 100 tanks, consider buying this cheap dividend stock with a 7.3% yield

The FTSE 100 index is in meltdown mode due to the spike in oil prices. This is creating opportunities for…

Read more »

Sun setting over a traditional British neighbourhood.
Investing Articles

UK investors should consider buying shares in Uber. Here’s why

Uber shares could be a great fit for long-term UK investors that are looking to generate capital growth, says Edward…

Read more »

This way, That way, The other way - pointing in different directions
Growth Shares

£1k invested in Rolls-Royce shares at the beginning of the year is currently worth…

Jon Smith points out how well Rolls-Royce shares have done so far in 2026, but issues caution when looking further…

Read more »

Finger clicking a button marked 'Buy' on a keyboard
Value Shares

It might not feel like it, but this is the time to think about buying stocks

The FTSE 100 isn’t the first place most investors look for quality growth stocks to consider buying. But Stephen Wright…

Read more »

A young woman sitting on a couch looking at a book in a quiet library space.
Investing Articles

How are Lloyds shares looking in March 2026?

Lloyds shares have taken a tumble in the last month. What has happened? And could this be a golden opportunity…

Read more »

piggy bank, searching with binoculars
Investing Articles

Are Barclays shares really 50% cheaper than HSBC right now?

Barclays shares are trading at a price-to-book ratio half that of rivals like HSBC. Ken Hall looks at what the…

Read more »