Share your opinion and earn yourself a free Motley Fool premium report!

We are looking for Fools to join a 75 minute online independent market research forum on 15th / 16th December.

To find out more and express your interest please click here

1 ISA mistake to avoid

This commonly overlooked investing mistake can cost ISA investors tens of thousands of pounds over time. Here’s how I’d try to avoid it.

| More on:

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.

ISA coins

Image source: Getty Images

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.

Investing regularly in a Stocks and Shares ISA can build substantial wealth over time. In fact, there are almost 5,000 ISA millionaires in the UK, according to the latest available data.

However, not every account is guaranteed to go up. Some can struggle, for a number of reasons.

Here, I want to look at one often overlooked mistake that can — quite literally — be very costly.

Fees and costs

I’m talking about the impact of fees associated with managing ISAs.

Now, some costs are unavoidable, including platform fees and stamp duty (a government tax) on dealing most UK stocks. This is the basic price we all have to pay to invest.

However, some UK brokers still charge customers for trading shares. Most US investors are shocked to learn this, as commission-free trading has been the norm for many years across the pond.

My Lifetime ISA and self-invested personal pension (SIPP) are with an online platform that still charges £5 per trade. So I’m careful not to overtrade. Thankfully though, it seems that trading fees in the UK are slowly going the way of the dinosaurs.

Foreign exchange fees can also be easy to overlook. These are paid on international shares (0.5%-1.5% per transaction, for example).

As we can see, regular trading (particularly with modest amounts) can quickly rack up a load of charges and significantly erode long-term returns.

That’s not all

Investors can also often underestimate the impact of annual management fees charged by funds.

A seemingly small 1% figure can dramatically reduce long-term gains due to compounding. For a £20,000 ISA growing at 7% annually, a 1% fee would cost more than £30,000 in lost returns over 30 years!

Most index trackers have expense ratios under 0.2% nowadays. But it’s always worth keeping an eye on the costs associated with actively managed funds. I try to prioritise low-cost options where possible.

I trust this one

One such fund that I hold is Scottish Mortgage Investment Trust (LSE: SMT). The share price is up 29% in one year and around 79% over five years.

The aim of the trust is to invest in the greatest growth companies in the world. Today, that includes Facebook owner Meta Platforms, AI chipmaker Nvidia, and e-commerce powerhouses MercadoLibre and Amazon.

Scottish Mortgage also gives investors exposure to exciting companies not listed on stock markets. These include internet payments platform Stripe and SpaceX, Elon Musk’s reusable rocket firm.

SpaceX is reportedly set to be valued at around $255bn next month, making it the most valuable private company in the US. Last month, it made history when it sent the world’s largest rocket into space and back, as well as catching the huge first-stage booster with the ‘chopstick’ arms of the launch tower. 

The opportunities that reliable Starship rockets would open up in space tourism, exploration and satellite launches are enormous.

One risk investing in Scottish Mortgage is that the portfolio is made up entirely of growth stocks. Were these to fall out of favour, as happened in 2022, the share price would likely underperform.

However, the ongoing charge for the trust is just 0.35%. That’s less than most actively managed rivals and significantly less than private equity funds.

As such, I reckon Scottish Mortgage offers my portfolio excellent value for money.

John Mackey, former CEO of Whole Foods Market, an Amazon subsidiary, is a member of The Motley Fool’s board of directors. Randi Zuckerberg, a former director of market development and spokeswoman for Facebook and sister to Meta Platforms CEO Mark Zuckerberg, is a member of The Motley Fool's board of directors. Ben McPoland has positions in MercadoLibre and Scottish Mortgage Investment Trust Plc. The Motley Fool UK has recommended Amazon, MercadoLibre, Meta Platforms, and Nvidia. 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

Warren Buffett at a Berkshire Hathaway AGM
Investing Articles

3 Warren Buffett investing ideas I plan to use in 2026

After decades in the top job at Berkshire Hathaway, Warren Buffett is preparing to step aside. But this writer will…

Read more »

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

Looking to earn a second income next year (and every year)? Here’s one approach.

Christopher Ruane explains how some prudent investment decisions now could potentially help set someone up with a second income in…

Read more »

Senior woman potting plant in garden at home
Investing Articles

Could a 10%+ yielding dividend share like this make sense for a retirement portfolio?

With a double-digit percentage yield, could this FTSE 250 share be worth considering for a retirement portfolio? Our writer weighs…

Read more »

Black woman using smartphone at home, watching stock charts.
Investing Articles

Forget Rigetti and IonQ: here’s a quantum computing growth stock that actually looks cheap

Edward Sheldon has found a growth stock in the quantum computing space with lots of potential and a really attractive…

Read more »

UK money in a Jar on a background
Investing Articles

Here’s a £3 a day passive income plan for 2026!

Looking for a simple and cheap plan to try and earn passive income in 2026 and beyond? Christopher Ruane shares…

Read more »

Blue NIO sports car in Oslo showroom
Investing Articles

NIO stock’s down 35% since October. Time to buy?

NIO stock has had a roller coaster year so far! Christopher Ruane looks at some of the highs and lows…

Read more »

Investing Articles

By December 2026, £1,000 invested in BAE Systems shares could be worth…

Where will BAE Systems shares be in a year's time? Here is our Foolish author's review of the latest analyst…

Read more »

Mature people enjoying time together during road trip
Investing Articles

Keen for early retirement with a second income from dividends? Here’s how much you might need to invest

Ditching the office job early is a dream of many, but without a second income, is it possible? Here’s how…

Read more »