Premium Bonds or stock market investing? What I think you should do this October

Premium Bonds are safe and offer the chance of a windfall. However, on average, stock market investing should build more wealth.

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.

October’s £1m Premium Bond winners have been announced. If you are one of them, then congratulations to you. However, the odds of a bond winning anything are 24,500 to 1, and winners should expect £25, not £1m, in the monthly draw. So, let’s not let the headlines distract us: the vast majority of bondholders are still waiting for a windfall.

With that in mind, it’s worth asking what a Premium Bond buyer can expect from their investment. Once we know that we can take a look and see if there are other investments that could build more wealth.

Premium Bond investing

Let’s explore what will happen with a £100 monthly investment in Premium Bonds (which cost £1 each) over 25 years. With no prizes, £30,000 would be saved over a quarter of a decade. But, we should consider the possibility of winning something. 

Prize draw details are available on the issuer’s (National Savings and Investments) website. I used the probabilities of winning various prizes to work out how much wealth investing £100 each month for 25 years in Premium Bonds might generate. On average the wealth level was £36,040. Premium Bond investors can expect to end up with  £40,950 or less 99% of the time.

Crunching the numbers reveals that 99% of the time, investors can expect a 2.4% annual return or worse on their Premium Bond investment, as described. There are investment options out there that can yield more than this. Before we get to them though it’s worth pointing out a few selling points of Premium Bond investing. The UK Treasury backs any savings and prize money, so an investor will never get back less than they put in. Additionally, Premium Bond prizes are entirely tax-free.

Stock market investing

Investing in the stock market has historically delivered better returns compared with investing in Premium Bonds. The FTSE 100 has delivered an average total return (including dividend reinvestment) of about 6.4% over the last 25 years. Investing £100 per month in a low-cost FTSE 100 index tracker could grow to £72,160 over 25 years.

Picking the right individual stocks to invest in could make an investor even richer. For example, Unilever, Diageo, and Reckitt Benckiser shareholders have enjoyed average returns of around 12.2%, 11.4%, and 10.1% over the last 10 years. And those are relatively safe, dividend-paying stocks. There are other – albeit riskier – growth stocks that could return even more.

Playing it safe

Stock market investing can be done on a tax-free basis, just like Premium Bond investing, inside a Stocks and Shares ISA. Investing in the stock market can, unlike Premium Bonds, return less than was put in. The best defence against this is to maintain a diverse portfolio. This can be done by investing in a fund that tracks an index or investing in multiple stocks. Being able to stick with a stock market investment for years – to allow market crashes time to correct themselves – is also advisable.

I am not going to tell anyone to stop investing in Premium Bonds. However, as long as an investor knows and understands the risks, and invests sensibly, they are more likely to build greater wealth by investing in the stock market.

James J. McCombie owns shares of Diageo and Unilever. The Motley Fool UK has recommended Diageo and Unilever. 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

Investing Articles

Down 35% in 2 months! Should I buy NIO stock at $5?

NIO stock has plunged in recent weeks, losing a third of its market value despite surging sales. Is this EV…

Read more »

Two employees sat at desk welcoming customer to a Tesla car showroom
Investing Articles

Could 2026 be the year when Tesla stock implodes?

Tesla's 2025 business performance has been uneven. But Tesla stock has performed well overall and more than doubled since April.…

Read more »

Portrait of elderly man wearing white denim shirt and glasses looking up with hand on chin. Thoughtful senior entrepreneur, studio shot against grey background.
Investing Articles

Could these FTSE 100 losers be among the best stocks to buy in 2026?

In the absence of any disasters, Paul Summers wonders if some of the worst-performing shares in FTSE 100 this year…

Read more »

Midnight is celebrated along the River Thames in London with a spectacular and colourful firework display.
Investing Articles

Up 184% this year, what might this FTSE 100 share do in 2026?

This FTSE 100 share has almost tripled in value since the start of the year. Our writer explains why --…

Read more »

Close-up as a woman counts out modern British banknotes.
Investing Articles

You can save £100 a month for 30 years to target a £2,000 a year second income, or…

It’s never too early – or too late – to start working on building a second income. But there’s a…

Read more »

Hydrogen testing at DLR Cologne
Investing Articles

Forget Rolls-Royce shares! 2 FTSE 100 stocks tipped to soar in 2026

Rolls-Royce's share price is expected to slow rapidly after 2025's stunning gains. Here are two top FTSE 100 shares now…

Read more »

Road 2025 to 2032 new year direction concept
Investing Articles

Brokers think this 83p FTSE 100 stock could soar 40% next year!

Mark Hartley takes a look at the factors driving high expectations for one major FTSE 100 retail stock – is…

Read more »

Investing Articles

I asked ChatGPT for the best FTSE 100 shares to consider for 2026, and it said…

Whatever an individual investor's favourite strategy, I reckon there's something for everyone among the shares in the FTSE 100.

Read more »