Stop saving and start investing! My plan for building a £1m ISA starting in 2019

Is it possible to invest your way to a million using an ISA? It surely is, as hundreds have already achieved exactly that.

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.

What’s the difference between saving and investing? I’ll give you one example… it’s like the difference between opening a Cash ISA and a Stocks & Shares ISA. 

A Cash ISA is essentially just a bank savings account, except that you don’t pay any tax on the interest you earn. But it’s likely to get you only around 1.5% at best, which isn’t even enough to keep pace with inflation. You’d be making a loss in real terms, but at least you wouldn’t pay tax on that loss — whoop-de-doo!

When you put money into a Cash ISA, or any other kind of savings account, it ultimately gets invested, you get your pittance in interest, and investment managers keep the rest.

Stocks & Shares

But if you go for a Stocks & Shares ISA, you choose what shares to buy and you get all of the profits from your investments (minus a small annual management charge) for yourself. Of course, you’ll shoulder any losses too.

But over the past century and more, investing in shares for the long term has beaten cash savings hands down. In fact it has to really, because cash savings can’t pay more in interest than is actually made from investing your cash.

The next question is, can you actually get as far as a million pounds by investing in an ISA? The easy answer to that is, yes you can.

I can say that confidently, because a survey of top providers has shown this year there are more than 250 individuals in the UK with at least a million in their ISAs. And there are a lot more with totals approaching that figure.

PEP start

Some of those will be investors who took advantage of PEPs, the forerunners which started in 1987 before converting to ISAs. But, according to Interactive Investor, using up the full annual allowance every year from 1987 until today, and putting it all in the FTSE All-Share, you would have racked up a million.

That’s £1m from investing over a period of 32 years. So someone retiring today at 65 would have had to start at the age of 33 to have that million to add to their pension pot. Imagine what they could have achieved had ISAs been around when they were 18?

That’s using a technically very simple way to go about it — just put your investment money into a tracker fund every year and forget about it. But can you do better? I certainly think it’s possible.

I prefer dividend-paying FTSE 100 stocks myself, as I see them as the least risky on the market. And they include the ones that have grown to become cash cows today.

Starting now

The long-term average annual return from UK stocks is approximately 8%, so let’s do some sums based on that. Using up your full £20,000 ISA allowance every year, it will take just 21 years to reach a million. Start today, and you could be a millionaire by 2040.

You might not have that much to invest, but just £100 per week could get you to a million in 36 years. The important thing is that every pound you invest, as early as you can, can make a big difference to how much you’ll have when you retire

Views expressed 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

Close-up of a woman holding modern polymer ten, twenty and fifty pound notes.
Investing Articles

Here’s what it takes to earn £50 a day of passive income in the stock market

What does someone need to do in the stock market to earn several hundred pounds a week on average in…

Read more »

Investing Articles

I’ve just doubled down on beaten-up Diageo shares – am I mad?

Harvey Jones can't stop buying Diageo shares because he thinks the falling FTSE 100 stock looks brilliant value. Now he…

Read more »

Businesswoman calculating finances in an office
Investing Articles

How much in dividends could someone earn over a decade by buying 100 Legal & General shares today?

Legal & General shares have lagged the market, but offer a whopping dividend. Christopher Ruane looks at what may happen…

Read more »

Group of young friends toasting each other with beers in a pub
Investing Articles

Here’s how a stock market crash could help me retire years earlier

Stock market crashes are both scary and amazing opportunities to create wealth. Which top share would I buy if there…

Read more »

Aerial view of York downtown at night
Investing Articles

Is the Fresnillo share price headed to £100?

The Fresnillo share price climbed more than any other FTSE 100 stock in 2025. Is it time for investors to…

Read more »

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

This FTSE stock just rocketed over 10% on strong results. Time to consider buying?

Jon Smith races to get up to speed on a FTSE company that surged this week, but explains why March…

Read more »

Two business people sitting at cafe working on new project using laptop. Young businesswoman taking notes and businessman working on laptop computer.
Dividend Shares

How an investor could make a 7% annual yield on a £20k ISA

Jon Smith talks through the strategy behind building a sustainable ISA that's designed to be an income generator with an…

Read more »

Three signposts pointing in different directions, with 'Buy' 'Sell' and 'Hold' on
Investing Articles

2 of my favourite UK stocks are down 10% in a week! Should I buy more?

Falling share prices can present buying opportunities. But should Stephen Wright be concerned about declines in two of his favourite…

Read more »