3 costly ISA mistakes to avoid

Christopher Ruane explains a trio of investment ideas used by Warren Buffett he hopes can reduce potential losses in his ISA.

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.

Person holding magnifying glass over important document, reading the small print

Image source: Getty Images

Investing via a Stocks and Shares ISA can be a lucrative activity. Disappointingly, it does not always turn out that way!

Successful investing involves getting things right – but it also means trying to avoid some common investing mistakes.

Here are three potentially costly missteps I aim to avoid with my Stocks and Shares ISA.

Chasing yield

A common error when trying to maximise income is chasing yield.

There is nothing wrong with having a strong dividend stream as an investing objective. Indeed, that is partly why I own shares like M&G and Legal & General.

But it is important not to let the tail wag the dog.

Is the high yield the only attraction of a share? Or is that yield a reflection of a solid business that is generating substantial profits or free cash flows?

Billionaire investor Warren Buffett says that he does not think in terms of buying shares. Rather, he considers the activity through the lens of owning a small stake in a business. I reckon a similar approach to investing via my ISA could help me avoid some yield traps.

Doing too much

Another thing Buffett tends to do is: not very much!

In fact, his masterly inactivity popped up in this year’s letter by the Sage of Omaha to shareholders in his company Berkshire Hathaway. He mused that the business’s results over the past few decades have largely been driven by about one “truly good decision” every five years.

In fairness, that does not mean he sits on his hands all day. He spends hours every day scouring company reports and trying to find great investments.

But Buffett’s approach involves making few investment moves. He waits to go for those he likes in a big way, rather than drip-feeding money into a wide range of mediocre opportunities.

Doing the same with my ISA makes sense to me.

Growing its value is a much more realistic proposition if I can find a handful of great investment opportunities than dozens of companies I simply think might be worth a punt. After all, I see an ISA as a vehicle for investment not speculation.

Keeping a lid on costs

When it comes to choosing companies in which to invest, people often look at how good the firm’s cost control is.

Buffett certainly does. Disciplined cost management can make the difference between an attractive top line and a less appealing bottom line.

But not everyone applies the same discipline to their own ISA!

Charges and fees can add up, meaning that even if I find great shares that go up in price or pay juicy dividends, I may still not get the rewards I would hope for.

That is why I am careful to choose a Stocks and Shares ISA that matches my own personal financial situation and investment objectives.

C Ruane has positions in Legal & General Group Plc and M&g Plc. The Motley Fool UK has recommended M&g Plc. 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

These British dividend stocks have been flying in 2026. I think there could be more to come!

If you think dividend stocks are boring, think again. Paul Summers looks at three FTSE 100 giants whose share prices…

Read more »

Investing Articles

Down 50%! 1 beaten-down FTSE 100 growth share to consider buying instead of Rolls-Royce

Harvey Jones highlights a growth share that has had a very bumpy five years but may finally be pointing in…

Read more »

Young Woman Drives Car With Dog in Back Seat
Investing Articles

How much is needed in an ISA to earn a £750 monthly passive income?

Christopher Ruane explains the timeline, approach and some risks of using the annual ISA contribution limit to build passive income…

Read more »

Investing Articles

Down 50% with a P/E of just 6.6! Should I buy even more of this stupidly cheap value stock?

Harvey Jones reckons this value stock has more recovery potential than any other blue-chip. So why isn't it flying with…

Read more »

Young female hand showing five fingers.
Investing Articles

Diageo: 5 reasons why a FTSE 100 turnaround is still possible

Diageo gave investors an all-too-familiar fright this week. So, why does this writer think things could improve in future for…

Read more »

Middle-aged white man wearing glasses, staring into space over the top of his laptop in a coffee shop
Investing Articles

With a P/E of 13 and 4.3% dividend yield, should I consider buying Greggs shares now?

Paul Summers takes a fresh look at the battered FTSE 250 baker. Is now the time to finally load up…

Read more »

Tesla building with tesla logo and two teslas in front
Investing Articles

After making a fortune on Tesla, Scottish Mortgage manager Baillie Gifford is piling into this ‘mini-SpaceX’ growth stock

Ben McPoland was intrigued to learn this well-known institutional investor has been loading up on a little-known growth stock recently.

Read more »

A handsome mature bald bearded black man in a sunglasses and a fashionable blue or teal costume with a tie is standing in front of a wall made of striped wooden timbers and fastening a suit button
Investing Articles

Here’s how I’m aiming for a million in my Stocks and Shares ISA

The best way to aim for a million in a Stocks and Shares ISA is by slow and steady progress…

Read more »