How long does it take to become an ISA millionaire?

Could your portfolio eventually reach seven-figure status?

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.

A common aim among investors is to become an ISA millionaire. While it is a challenging prospect, it has generally become much easier in recent years. That’s simply because the ISA allowance has gradually increased. For example, while a decade ago it was £7,000 per annum, today it is £20,000 per year. As such, making a million may now be a more realistic aim for Foolish investors.

Simple strategy

Assuming an investor is able to invest £20,000 into an ISA each year, it is possible to start with nothing and end up with £1m within 23 years. This assumes that the investor is able to generate an annual total return of 7% during the period, which is roughly what can be expected from the UK’s main index.

Clearly, not everyone will be able to allocate £20,000 to an ISA every year. And the return on an investment may be higher or lower than the average of 7%. However, the prospect of becoming an ISA millionaire appears to be open to a significant number of investors in the long run. This means that an ISA could prove to be a realistic alternative to a pension at a time when retirement prospects are uncertain for a large number of people.

Improving performance

Of course, it is possible to generate a higher return than 7% per annum. Since ISAs are mostly invested for the long term, it may be a sound idea to invest in mid-caps and smaller companies alongside larger stocks. That’s because mid and small-caps could offer higher return prospects in the long run, as they generally have higher growth potential than their larger peers. And while they may be more volatile, this would not matter to an investor who is focused on the size of a nest egg 20+ years from now.

Similarly, seeking stocks that offer better value for money or stronger growth prospects than those of the wider index could be another means of speeding-up the process of becoming an ISA millionaire. Value investing has been shown to offer relatively strong performance over the long run, while investing in stocks that pay higher dividends may also be a source of improved returns – especially if dividends are reinvested.

Long-term potential

Clearly, changes to the allowance and tax benefits of an ISA could be ahead. A new government may wish to make alterations in this respect, so there is no guarantee that simply investing a large sum each year in a range of stocks will lead to millionaire status.

However, there is at least the potential for any individual who has spare cash available each year to generate a tax-efficient return which over the long run could add up to a significant sum of money. And for investors who are able to consistently beat the market, the eventual nest egg could be even more impressive.

More on Investing Articles

Young mixed-race woman looking out of the window with a look of consternation on her face
Investing Articles

With stock market risks emerging, is now the time to consider the 60/40 portfolio?

The stock market could be in for a period of turbulence. Here’s a simple strategy that can help long-term investors…

Read more »

Bus waiting in front of the London Stock Exchange on a sunny day.
Investing Articles

Is a stock market crash coming? It’s not too late to get ready!

Christopher Ruane sees reasons to fear a coming stock market crash. Rather than tying to time it, he's hoping to…

Read more »

Investing Articles

Down 4% in 2026, is now the time to consider buying Nvidia shares

Has Nvidia become too big to keep growing? Or is the stock’s decline this year a chance to think about…

Read more »

Investing Articles

Is the party finally over for Rolls-Royce shares?

Rolls-Royce shares have made investors rich but momentum is slowing and the Iran conflict isn't helping. How worried should we…

Read more »

Asian man looking concerned while studying paperwork at his desk in an office
Investing Articles

7.8% dividend yield! A dirt-cheap UK income share to buy today?

I’m on the hunt for lucrative passive income opportunities, and this under-the-radar FTSE stock currently offers a whopping 7.8% dividend…

Read more »

Close-up image depicting a woman in her 70s taking British bank notes from her colourful leather wallet.
Investing Articles

3 passive income stocks tipped to soar 41% (or more) by 2027

One of these shares offering passive income is trading at a massive 79% discount to where City analysts think it…

Read more »

Mature Caucasian woman sat at a table with coffee and laptop while making notes on paper
Investing Articles

171,885 shares of this FTSE dividend star pays an income equal to the State Pension

Zaven Boyrazian calculates how many shares investors would have to buy to generate enough income to match the UK State…

Read more »

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

This stock’s the opposite of red-hot at the moment. But I reckon it could still be one to buy

The recent dramatic fall in the value of this FTSE 100 stock makes James Beard think it’s a stock to…

Read more »