‘I’m a money expert and ISA decision could cost you £100,000’ | Personal Finance | Finance

Antonia Medlicott, founder and MD of Investing Insiders (Image: Investing Insiders)
Pensions and ISAs are two of the most important tools when it comes to our finances, helping us to save for the future and hit our financial goals. However, with so many options available when it comes to which providers and funds to choose from, a finance expert has warned savers that they could be missing out on potential thousands, all because they didn’t do their research beforehand.
To help inform people that they should take control of the pots their money is kept in, Antonia Medlicott, founder and managing director of financial education specialists Investing Insiders, has compared the best and worst performing stocks and shares ISA and pension providers to show just how much money could be being left on the table and it’s not small amounts.
ISA differences
“It’s important to understand the different types of ISA portfolios available,” Antonia explained. “The most popular categories are adventurous, balanced, cautious, and conservative, with the amount of risk your money is at descending as you go through them. Adventurous portfolios offer the highest risk but the highest potential returns, whilst conservative funds offer the opposite.
“With this in mind, we found that the best-performing ISA over a 10-year period is one that fits into the adventurous category, with returns of 224.98 per cent. On the other hand, the worst-performing ISA belongs to the conservative category, with returns reaching just 9.2 per cent. This really showcases just how different the results across these portfolios can be – and the impact of choosing the wrong one.

Getting your money in the right place is key (Image: stocknshares via Getty Images)
“In real terms of how much money you stand to make, if you’d have invested £10,000 into the highest-performing ISA 10 years ago, you’d have more than tripled your money, with it now sitting at around £32,498. In comparison, the same amount invested in the lowest-performing account would see you with an increase of just £920, which is not an amount you want to see after 10 years of investment. That’s an astronomical difference of £21,578 between the amount of money you would’ve earned, and that’s only over a 10-year period. Increase that to 20, or even 30 years, and the distance between the two grows exponentially.”
“If you’re a diligent saver with an ISA pot of £50,000 saved up, the difference over just 10 years becomes even more unbelievable. In the high-performing ISA, you would have £162,490, compared to £54,600 if you went with the opposite choice. With a difference of over £100,000, it’s easy to see why these decisions matter.”
Pension differences
Antonia said: “If you’re part of a workplace pension, for the most part you won’t have any say over the pension provider that your savings are with. However, you can control the fund and risk level, as much like ISAs, pension providers also offer a variety of funds to help you achieve your savings goals, ranging from high risk to low risk, and the success of these portfolios can fluctuate massively.
“For the high-risk portfolios, the best-performing option with the highest five-year cumulative total returns since 2020 had returns of 180.28 per cent, whilst the worst-performing option actually saw huge losses of -98.59 per cent. So, depending on your provider, your money could almost have tripled, or have been nearly lost entirely.
“This means someone with a £50,000 fund would have increased their pot to £140,140 in the last five years in the best fund, but reduced it to £705 in the worst, a startling difference of 19,778 per cent. A modest £10,000 fund would be worth £28,028 if kept in the top performer, or have fallen to £141 in the worst.
“Looking at the medium-risk funds, it’s a very similar story, albeit with a smaller margin. The best-performing fund saw a five-year return of 79.81 per cent, whilst the worst-performing again saw losses, this time of -46.31 per cent. Even in a low-risk fund, the best-performing portfolio saw returns of 39.34 per cent, with the worst-performing making a loss of 25.64 per cent.
“If you’re early on in your pension-saving journey, high-risk funds are often the best choice, as you can afford to take more risk to help give you an initial boost, and have decades to recover any losses. As you approach retirement, you may want to consider switching to a low-risk fund, ensuring that your money is more stable whilst still most likely experiencing some growth before you access it.”
Finally, Antonia said: “These figures go to show how being more invested in your ISAs and pensions can have a huge impact down the line, and by making the right choices early, you’re setting yourself up for a strong financial future.”


