Why a Stocks and Shares ISA will make you richer 98% of the time

If you invest in stocks and shares for the long term, Harvey Jones says the odds of winning are firmly in your favour.

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’m not a gambling man. I don’t like taking big risks with money, I like the odds to be in my favour. Yet I invest all my long-term retirement funds in stocks and shares.

Why would I do that? Stock markets are simply not as risky as you think, provided you give them time.

Positive return

New analysis backs me up by showing if you invest in the stock market for at least 10 years you will generate a positive return 98% of the time. Now those are the type of odds I am willing to take a punt on.

Investment platform Willis Owen found that over the long term, a stock market index such as the FTSE 100 is nearly always a long-term winner. It looked at the total return of the FTSE 100 over 10 years on a rolling monthly basis since January 1986 and found investors would have made a profit in 275 out of 281 periods. They would have lost out in just six. Again, I like those odds.

The average total 10-year return with dividends reinvested was an impressive 139.36%, turning £10,000 into £23,936. The largest return was 433% while the biggest loss was 14.5%. 

Rotten timing

The only time you would have lost money since 1986 would be if you bought during the tech boom and sold during the financial crisis.

Investors who got caught up in dot.com euphoria and bought in the six months running from January to June 1999, then lost their nerve in the wake of the financial crisis and sold in the same six months a decade later in 2009, would have lost out.

That’s the only way you could have lost money over a 10-year term in the last 33 years. I can’t imagine many people actually did that. Since most people invest in dribs and drabs and take their money out in dribs and drabs, I would argue that the chances of making a profit over 10 years is actually greater than 98%.

Think long term

Over shorter periods, the stock market becomes more of a gamble. For example, if you had bought the FTSE 100 on 1 January 2017 and sold on 31 December that year, your total return would have been 11.9% with dividends reinvested. If you had bought on the same dates in 2018, you would have made a loss of 8.7%.

You shouldn’t invest in shares for just one year. Five years is the absolute minimum. Willis Owen’s analysis shows that investors received a positive return 88% of the time if they invested over that term.

Making a million

Shorter investment terms are riskier as you have less time to recover from any correction. If you are saving for retirement, you should ideally be putting money away for 20, 30 or 40 years, which is when stock markets really work their magic.

If you give it long enough, you could even make a million from a Stocks and Shares ISA. If you are wondering how to get started, here are some of the stocks that ISA millionaires have put their money on. It’s been a winning investment for them. And less of a gamble than you think.

Harvey Jones 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

Front view of aircraft in flight.
Investing Articles

Is it game over for the BP share price rally?

The BP share price has looked like a one-way bet in recent weeks as oil and gas prices soar but…

Read more »

Man hanging in the balance over a log at seaside in Scotland
Investing Articles

Amid geopolitical and AI risks, here’s how I’m positioning my ISA and SIPP in 2026

Edward Sheldon explains how he's allocating capital within his investment accounts and SIPP amid the various risks to the market.

Read more »

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

My game plan for the next stock market crash

Markets have been surprisingly resilient during the recent Middle East conflict but we still cannot rule out a stock market…

Read more »

Concept of two young professional men looking at a screen in a technological data centre
Investing Articles

1 top growth stock to consider buying after it crashed 59%

This S&P 500 growth stock has fallen off a cliff lately due to AI software fears. Our writer thinks this…

Read more »

A mature woman help a senior woman out of a car as she takes her to the shops.
Investing Articles

Here’s how a 35-year-old putting £15 a day into an ISA could end up earning £18k+ of passive income annually!

A 35-year-old with no ISA but a willingness to invest relatively small sums could one day be earning many thousands…

Read more »

Young black colleagues high-fiving each other at work
Investing Articles

With the potential to double in 10 years, this could be a dividend stock to consider buying

With a yield of 7.2%, income investors might consider buying this stock. But reinvesting the dividends could deliver even more…

Read more »

Happy couple showing relief at news
Investing Articles

How much would someone need to invest in the stock market to target a £1,250 monthly second income?

Investing in the stock market can help deliver long-term wealth. But James Beard says it can also be a way…

Read more »

happy senior couple using a laptop in their living room to look at their financial budgets
Investing Articles

How much would someone need in an ISA to aim to treble the current State Pension?

Experts say the State Pension isn’t generous enough to provide a comfortable retirement. James Beard says the stock market could…

Read more »