Funds vs Shares: How Should You Invest Your ISA Allowance?

With ISA season almost upon us, should you buy shares or funds with your annual allowance?

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.

There is great debate among investors and financial services professionals about whether buying shares in companies or units of funds is a better idea. Clearly, there are advocates for both sides of the argument and, now that you will have another £15,240 to invest in either (or both) through your ISA, it seems to be a good time to revisit the question.

Diversification

While it is possible to gain access to a wide variety of companies in different sectors, which operate in different regions, and that are of different sizes, funds allow you to have far more diversification than do shares. In fact, even if you invest all of your cash in just one fund, you are still likely to have more diversification than you could achieve through shares alone. For example, you may wish to invest in UK-listed companies and, while your portfolio may contain 20-40 stocks, a fund could have literally hundreds of companies included within it.

Costs

Shares, however, are a much cheaper way to invest in the long run. For example, you can invest for as little as £2 per trade (using aggregated orders), which means that even if you buy 40 stocks with this year’s allowance, you will still only pay £80 in your first year in dealing charges. This works out as just 0.5% of the annual allowance, which is the same as stamp duty and, moving forward, the only other cost will be to sell the shares a number of years down the line.

Funds, however, can charge much more. For example, even a tracker fund will charge upwards of 0.35% per annum, while an actively managed fund will typically charge 1% or 1.5% per annum. So, assuming you invest £15,240 right now and nothing else for five years, and the value of your portfolio remains at the initial level throughout the period, you will pay £266 in total for a tracker fund and up to £1143 in total for an actively managed fund. That’s significantly more than the cost of dealing in shares and, for many investors, is a deal breaker.

Performance

Clearly, the people running funds are professionals and, in general, they will be more knowledgeable than part-time, private investors. However, there is still no clear cut evidence that fund managers, in general, outperform private investors in the long run once the cost of their services has been deducted. So, if it’s better performance you’re after, then funds may not be the answer.

Time

Of course, it is often argued that funds require less time than shares, with investing in companies needing vast amounts of research and funds requiring relatively little. However, some funds are better than others, just as some companies are more appealing than others, and so, realistically, you are likely to spend just as long finding the right fund manager as you are the right stocks. Certainly, logic says that you should be spending at least as much time performing due diligence when you trust someone else with your hard-earned cash as you do when you are making your own investment decisions.

So, while funds do make diversification easier, in today’s internet age buying shares is so straightforward, cheap and information is so freely available that for most investors buying stocks with their ISA allowance could be the most appealing option. Certainly, mistakes will occur, but with patience and a long term view you can start to build a comfortable retirement through buying slices of high quality companies with this year’s ISA allowance.

More on Investing Articles

Investing Articles

Is Alphabet still one of the best shares to buy heading into 2026?

The best time to buy shares is when other investors are seeing risks. Is that the case with Google’s parent…

Read more »

Investing Articles

Could the Barclays share price be the FTSE 100’s big winner in 2026?

With OpenAI and SpaceX considering listing on the stock market, could investment banking revenues push the Barclays share price higher…

Read more »

Investing Articles

Will the Nvidia share price crash in 2026? Here are the risks investors can’t ignore

Is Nvidia’s share price in danger in 2026? Stephen Wright outlines the risks – and why some might not be…

Read more »

Middle-aged white man pulling an aggrieved face while looking at a screen
Growth Shares

I asked ChatGPT how much £10,000 invested in Lloyds shares 5 years ago is worth today? But it wasn’t very helpful…

Although often impressive, artificial intelligence has its flaws. James Beard found this out when he used it to try and…

Read more »

Portrait of pensive bearded senior looking on screen of laptop sitting at table with coffee cup.
Investing Articles

Did ChatGPT give me the best FTSE stocks to buy 1 year ago?

ChatGPT can do lots of great stuff, but is it actually any good at identifying winning stocks from the FTSE…

Read more »

Surprised Black girl holding teddy bear toy on Christmas
Investing Articles

Who will be next year’s FTSE 100 Christmas cracker?

As we approach Christmas 2025, our writer identifies the FTSE 100’s star performer this year. But who will be number…

Read more »

Businessman with tablet, waiting at the train station platform
Investing Articles

I asked ChatGPT for an 8%-yielding passive income portfolio of dividend shares and it said…

Mark Hartley tested artificial intelligence to see if it understood how to build an income portfolio from dividend shares. He…

Read more »

Female student sitting at the steps and using laptop
Investing Articles

How much do you need in an ISA to target £8,333 a month of passive income?

Our writer explores a potential route to earning double what is today considered a comfortable retirement and all tax-free inside…

Read more »