3 pieces of Warren Buffett advice I’m using to try to become an ISA millionaire

Jonathan Smith looks over advice from legendary investor Warren Buffett and sees how long-term thinking can help him to become an ISA millionaire.

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.

The Stocks and Share ISA deadline at the start of April really focused my mind on my portfolio. Each year, the ‘allowance’ of £20,000 resets, allowing me to invest up to £20,000 over the following 12 months and to know the returns will be tax-free. Over time, if I invest the full amount, my dividends and unrealised gains from (hopefully) rising share prices really can mount. I’d like to become an ISA millionaire one day. In this aim, there are some good pointers I can use from legendary investor Warren Buffett to help me on my way.

Stay patient… and have realistic expectations

One quote from Buffett that makes me chuckle is when he said that “you can’t produce a baby in one month by getting nine women pregnant.” He applied this to investing, and I think trying to reach ISA millionaire status is the same.

I can’t speed up the process of reaching the million mark from having lots of Stocks and Shares ISAs. I’m only allowed one with the investment ceiling of £20,000 per year. So logically, it’s going to take me many years to reach this goal. My goal can be accelerated by higher stock returns. Yet in a similar way to having a baby, good things need time and I have to be patient.

So from this, I want to ensure that I don’t get overly anxious about the speed with which my investment pot is growing. 

A second piece of advice that I think is relevant to becoming an ISA millionaire is when Warren Buffett said “the rearview mirror is always clearer than the windshield.”

What I read here is that assessing the past performance of stocks is much easier than trying to predict the future. Just because a stock rose by X% last year doesn’t mean it will again next year. For my ISA, this means I need to be reasonable in the future returns I’m expecting. 

For example, the FTSE 100 is up over 35% from the stock market crash a little over a year ago. But it’s unlikely it’ll increase by 35% this year. So when trying to think about a realistic timeframe to become an ISA millionaire, I need to take such exceptional years into account to avoid disappointment.

ISA millionaire: invest, don’t trade

The final piece of advice from Buffett is that “Wall Street makes its money on activity. You make your money on inactivity”. Wall Street here refers to financial companies, including the one with which I hold my ISA!

It’s no secret that one way companies like this make money is from fees when I trade in and out of stocks. Over time, these can really add up, especially if I’m flipping in and out of stocks every week. 

In fact, the best way for me to reach ISA millionaire status in the long run is to be as frugal as possible on unnecessary trading. Buying is fine, but selling for short-term profits can lead me to miss out on further growth and those dealing fees will add up.

Holding stocks for the long term also lets me benefit from compounded growth. For instance, if I buy more shares with my dividend income, the next year, I’m earning X% on a bigger number of shares. Warren Buffett is a big fan of compounding!

jonathansmith1 has no position in any of the shares mentioned. 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

Warren Buffett at a Berkshire Hathaway AGM
Investing Articles

Can someone invest like Warren Buffett with a spare £500?

Christopher Ruane explains why an investor without the resources of billionaire Warren Buffett could still learn from his stock market…

Read more »

Investing Articles

Can these 2 incredible FTSE 250 dividend stocks fly even higher in 2026?

Mark Hartley examines the potential in two FTSE 250 shares that have had an excellent year and considers what 2026…

Read more »

Thoughtful man using his phone while riding on a train and looking through the window
Investing Articles

Is 45 too late to start investing?

Investing at different life stages can come with its own challenges -- and rewards. Our writer considers why a 45-year-old…

Read more »

Hand of person putting wood cube block with word VALUE on wooden table
Investing Articles

UK shares look cheap — but the market might be about to take notice

UK shares have traded at a persistent discount to their US counterparts. This can create huge opportunities, but investors need…

Read more »

Investing Articles

This FTSE 100 growth machine is showing positive signs for a 2026 recovery

FTSE 100 distributor Bunzl is already the second-largest holding in Stephen Wright’s Stocks and Shares ISA. What should his next…

Read more »

Investing Articles

I asked ChatGPT for the best FTSE 100 stocks to buy for passive income in 2026 and it said…

Paul Summers wanted to learn which dividend stocks an AI bot thinks might be worth buying for 2026. Its response…

Read more »

ISA Individual Savings Account
Investing Articles

Stop missing out! A Stocks and Shares ISA could help you retire early

Investors who don't use a Stocks and Shares ISA get all the risks that come with investing but with less…

Read more »

Investing Articles

Will Greggs shares crash again in 2026?

After a horrible 2025, Paul Summers takes a look at whether Greggs shares could sink even further in price next…

Read more »