2 ISA mistakes I’m keen to avoid

Looking to make the most of your ISA? Here are two errors Royston Wild thinks all savers and investors need to beware of.

| 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.

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.

Businessman with tablet, waiting at the train station platform

Image source: Getty Images

The Individual Savings Account (ISA) is an excellent investment product, in my view.

With an annual allowance of £20,000, the Stocks and Shares ISA and Cash ISA meet the needs of most investors. With these tax wrappers, investors don’t pay a single penny in capital gains tax or dividend tax.

But while they’re good products, many investors make poor decisions when it comes to using their ISAs. Here are two mistakes I’m constantly seeking to avoid.

Please note that tax treatment depends on the individual circumstances of each client and may be subject to change in future. The content in this article is provided for information purposes only. It is not intended to be, neither does it constitute, any form of tax advice. Readers are responsible for carrying out their own due diligence and for obtaining professional advice before making any investment decisions.

1. Holding too much cash

It’s crucial that investors like me diversify across ‘risk on’ and ‘risk off’ assets.

Like many people, I do this by holding some of my capital in a savings account, and investing the rest in a variety of shares, trusts, and funds.

I can potentially get a better return with the stock market. But share investing can be volatile, and the value of my holdings could potentially sink. This is where the safe savings account comes in — my money is protected, and I can make a guaranteed return.

There’s no correct answer as to how much to hold in cash versus in stocks. This is a personal choice depending on one’s investing goals and risk tolerance. But I’m an ambitious investor, and worry about making poor returns by alloting too much capital in a savings account.

My money might be safe in a 4%-yielding cash account. But after 30 years, a £20,000 lump sum investment would turn into just £66,270.

By comparison, an 8%-returning basket of shares could make me more than three times as much (£218,715). This is why I constantly monitor my portfolio to check I’ve got the balance right.

Compound returns on a £20,000 investment.
Source: thecalculatorsite.com

2. Owning too few shares

Diversifying my stocks portfolio across a number of shares is another important concept for ISA investors. Failure to do this raises risk. It also limits my exposure to different investment opportunities.

A portfolio holding just two or three shares, for instance, could crash in the event of a single disappointing trading update.

I own roughly 10 to 15 individual shares across multiple sectors in my own portfolio. I also own several exchange-traded funds (ETFs).

Funds like this let me invest in dozens, even thousands, of underlying assets. And I only get charged a single transaction fee when I put in a buy order. Conversely, if I purchased each individual stock I’d pay a broker fee on each one.

The HSBC S&P 500 ETF (LSE:HSPX) is one such fund I currently own. As the name implies, it spreads my investment across the entire S&P 500, which in turn diversifies my holdings across many companies and industries.

Sector diversification
Source: HSBC

What’s more, its focus on large-cap multinational companies reduces my risk still further by providing exposure to different regions.

The past is not a reliable indicator of future returns. But the fund has delivered an average annual return of 13% over the last decade. This is the sort of figure that could supercharge my long-term wealth.

On the downside, the fund is likely to deliver a disappointing return during temporary economic downturns. But I’m confident it will be a great wealth creator for me over a few decades, driven by the strong US economy and 21st century technology boom.

Royston Wild has positions in Hsbc ETFs Public - Hsbc S&P 500 Ucits ETF. 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

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

2 spectacular growth stocks to consider buying in March

Investors ignore the risks with growth stocks when things are going well. But when this changes, fixating on the dangers…

Read more »

UK financial background: share prices and stock graph overlaid on an image of the Union Jack
Investing Articles

Why is the FTSE 100 suddenly beating the S&P 500?

The UK's blue-chip index has been on fire over the past couple of years, helping it catch up to the…

Read more »

Artillery rocket system aimed to the sky and soldiers at sunset.
Investing Articles

This non-oil FTSE stock’s risen 4.6% in 3 days. What’s going on?

Against the backdrop of trouble in the Middle East, James Beard investigates why this FTSE 100 stock’s doing so well.…

Read more »

Three signposts pointing in different directions, with 'Buy' 'Sell' and 'Hold' on
Investing Articles

Has a 2026 stock market crash just come a whole lot closer?

If we're in for a stock market crash, what's the best way for us to prepare, and what kinds of…

Read more »

Silhouette of a bull standing on top of a landscape with the sun setting behind it
Investing Articles

Up 79% in a year, this FTSE 250 stock still gets a resounding Strong Buy from analysts

This under-the-radar growth stock in the FTSE 250 has been on fire over the past 12 months. Why are City…

Read more »

Frustrated young white male looking disconsolate while sat on his sofa holding a beer
Investing Articles

Vistry shares down 20%! Here’s what I’m doing…

Vistry shares have crashed as the firm cuts prices and moves away from share buybacks. But is Stephen Wright’s long-term…

Read more »

UK financial background: share prices and stock graph overlaid on an image of the Union Jack
Investing Articles

The IAG share price is climbing today despite war fears – what’s going on?

It's been a tough week for the IAG share price and Harvey Jones expects more volatility. Yet the FTSE 100…

Read more »

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

By March 2027, £1,000 invested in Natwest shares could turn into…

NatWest shares have been on a tear in recent years. What might the next 12 months have in store for…

Read more »