We have some exciting news to share! The Motley Fool UK has now become The Twelfth Magpie -- an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. This site is our new home, and there will be extra tweaks made across the coming few days as we settle in. So if anything looks a little off, please bear with us!

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.

With an empty ISA at 30, I’d follow Warren Buffett’s golden rule to build passive income

One of Warren Buffett’s most famous sayings has been called his ‘golden rule’. Here’s how I’d use it to build a second income.

Warren Buffett at a Berkshire Hathaway AGM

Image source: The Motley Fool

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.

If I were just opening my first Stocks and Shares ISA, I’d follow the lessons handed down by legendary investor Warren Buffett.

At 93 years old, he’s been in the investing game longer than most people have been alive. And his long-term record — a return of 19.8% per year over nearly six decades at Berkshire Hathaway — is just phenomenal. In fact, it’s exactly double the market average!

XXX

When building passive income, I’d particularly absorb what has been dubbed Buffett’s ‘golden rule’.

Rule number 1 (and 2)

Rule No. 1: Never lose money. Rule No. 2: Never forget Rule No. 1

Warren Buffett

First, I should point out that Buffett isn’t speaking literally in the never-lose-money quote above. The Oracle of Omaha has lost money before, both during the financial crisis of 2008 and on his ill-fated Tesco investment.

All investors lose money, even the very best. It’s just that their winners — both in quantity and magnitude — far outweigh the losers.

What Buffett is underscoring though is the mindset that a sensible investor should learn. Investing isn’t buying meme stocks or the latest penny share trending on social media. That’s gambling, and tips the odds in favour of losing money.

Buffett picks companies rather than stocks. In other words, behind every stock is a real-world business, and over time it’s the underlying business that will ultimately deliver value or not. The market itself and stocks in general are largely irrelevant.

This is why Buffett has also said: “Only buy something that you’d be perfectly happy to hold if the market shut down for 10 years.”

Finding value

Given this, it’s crucial that I understand how a company makes money and what competitive advantages it possesses (if any).

However, finding great companies is only the first and arguably easiest part. A crucial element underpinning Buffett’s golden rule is finding a margin of safety.

This represents the difference between what I think the intrinsic value of a stock is and its current market price. It’s essentially a cushion that provides protection against errors in analysis or unforeseen developments.

I can find the greatest business in the world, but it may turn out to be a lousy investment if I grossly overpay to become a shareholder. That’s why bear markets and crashes often prove the most fruitful periods to find stock market bargains.

Investing for decades

One surefire way to lose money — and fail to build passive income — is to regularly trade in and out of stocks. The opposite, of course, is buying to hold.

A perfect example of this is Buffett’s purchase of 400m Coca-Cola shares. This was completed in 1994 after around seven years of accumulation for a total cost of $1.3bn.

Berkshire still owns those shares today, and the returns on them are quite mind-boggling. This year alone, the firm is set to rake in $736m in dividends, up from $75m in 1994.

Or to put it another way, the original investment is now more than doubling every two years from dividends alone. That equates to a 57% yield on cost! And without lifting a finger, it continues to grow.

This demonstrates the power of long-term compounding. It’s something all investors can learn from, whatever stage they’re at on their investing journey.

Ben McPoland has no position in any of the shares mentioned. The Motley Fool UK has recommended Tesco 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

Friends and sisters exploring the outdoors together in Cornwall. They are standing with their arms around each other at the coast.
Investing Articles

£503 buys 14 shares in this FTSE 250 stock that returned 23.9% annually for the last 15 years

This FTSE 250 stock has averaged a huge return for 15 years. At today's price, £503 buys 14 shares. But…

Read more »

Black woman using loudspeaker to be heard
Investing Articles

£1,000 buys 25 shares in this FTSE 100 stock that’s returned 29.2% annually for the last 10 years

This FTSE 100 mining stock has returned close to 30% a year for a decade. At 3,995p, £1,000 buys 25…

Read more »

Female student sitting at the steps and using laptop
Investing Articles

Down 47%, is this growth stock finally worth buying in May?

With a £288m order book and a hidden pipeline of defence and nuclear contracts, is this growth stock now too…

Read more »

House models and one with REIT - standing for real estate investment trust - written on it.
Investing Articles

2 REITs yielding 7%+ to consider for passive income in 2026

A REIT backed by the NHS and another backed by Tesco and Sainsbury's with both yielding 7%+. Here's why I'm…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

Just 97 shares of this UK dividend stock generate £238 in passive income

A 5.7% yield, £238 in passive income from just 97 shares, and one of the most divisive dividend stocks on…

Read more »

ISA coins
Investing Articles

£10,000 in an ISA generates a second income of…

The London Stock Exchange is home to some of the world's most generous dividends. But how big a second income…

Read more »

Shot of a senior man drinking coffee and looking thoughtfully out of a window
Investing Articles

Expert recommendations: 2 top income stocks yielding 7%+!

With yields of 7.2% and 7.8% respectively, these two income stocks are catching the eyes of institutional analysts. Should investors…

Read more »

Illustration of flames over a black background
Investing Articles

3 top income-focused stocks to buy in May 2026, according to experts

Looking for a stock to buy for income in May 2026? Experts have flagged these three UK dividend shares as…

Read more »