The 90/10 Portfolio: Buffett Recommendation
Warren Buffett's estate instructions point at a near-all-stock mix. Here's what the 90/10 portfolio is, why he favors it, and who it actually suits.
Don't have time? Here's what you need to know:
- 1Buffett's 2013 shareholder letter described a 90% S&P 500 / 10% short-term Treasuries mix for a trust benefiting his wife.
- 2The 10% bond sleeve barely cushions a crash; its real role is providing cash so you never sell stocks at the bottom.
- 390/10 falls roughly 45% in a 50% stock bear market, so it suits only long-horizon, high-tolerance investors.
- 4Build it with VOO (or VTI + VXUS) for the 90% and a short-term Treasury fund like SHY for the 10%.
The Buffett Connection
The 90/10 portfolio gets its fame from Warren Buffett. In his 2013 letter to Berkshire Hathaway shareholders, Buffett described the instructions he left for the trust benefiting his wife: put 90% of the money in a low-cost S&P 500 index fund and 10% in short-term government bonds. He argued this simple mix would beat the results most investors get from higher-fee, more complicated strategies.
The 90/10 portfolio holds 90% in stocks and 10% in bonds or cash-like government securities. It is one notch more aggressive than 80/20 and just shy of an all-stock portfolio. The 10% sleeve is deliberately small, it is there to provide a little stability and a source of funds for spending or rebalancing, not to materially change the portfolio's growth profile, which is driven almost entirely by the 90% in equities.
Why a Near-All-Stock Mix Can Make Sense
Buffett's reasoning rests on two durable ideas. First, over long horizons, low-cost broad equity index funds have outperformed the large majority of actively managed and more complex strategies, mainly because they keep costs minimal and capture the market's full return. Second, for money that will not be touched for a very long time, the higher volatility of stocks is a feature you can ride out rather than a danger to avoid.
The 10% in short-term government bonds plays a specific role in his design: it is the buffer that can be spent during a market crash so the equity sleeve is never sold at the bottom. Buffett famously suggested the bond portion exists so a downturn never forces a sale of stocks at depressed prices. That framing, holding cash-like assets to avoid selling stocks low, is a useful way to think about why even an aggressive portfolio keeps a small fixed-income sleeve.
Tip: Think of the 10% bond sleeve as your 'never sell stocks at the bottom' fund. Its job is to cover spending during a crash so the 90% in equities can recover untouched.
Who Should and Shouldn't Run 90/10
A 90/10 portfolio fits investors with a long horizon, a high tolerance for volatility, and the discipline to hold through deep drawdowns. In a severe bear market where stocks fall 50%, a 90/10 portfolio drops about 45%, only marginally better than an all-stock portfolio. If a paper loss of that size would push you to sell, 90/10 is too aggressive for you regardless of what any famous investor does.
It is also worth noting that Buffett's specific instruction was for a particular situation, a surviving spouse with more than enough money and a simple mandate, not a universal prescription. Younger accumulators may reasonably go even further to 100% stocks, while anyone near or in retirement who needs the money soon should hold considerably more in bonds. Use 90/10 as a model for the aggressive end of the spectrum, not a one-size-fits-all answer.
Important: 90/10 falls almost as hard as an all-stock portfolio in a crash, roughly 45% versus 50%. The small bond sleeve barely cushions losses; its real value is providing cash so you never sell stocks low.
Building a 90/10 Portfolio
The purest Buffett-style build is 90% in an S&P 500 fund like VOO and 10% in short-term Treasuries via a fund such as SHY or BSV. Many investors broaden the equity side to the total U.S. market with VTI and add international exposure through VXUS, which gives wider diversification than the S&P 500 alone while keeping the 90/10 balance.
A reasonable three-fund version might be 65% VTI, 25% VXUS, and 10% short-term bonds. Whichever route you take, rebalance about once a year. Because the 10% sleeve is so small, an aggressive portfolio like this drifts quickly, so a regular check keeps the buffer from shrinking to nothing after a strong run for stocks.
| Sleeve | Buffett-style build | Globally diversified build |
|---|---|---|
| U.S. stocks | 90% VOO (S&P 500) | 65% VTI (total market) |
| International stocks | — | 25% VXUS |
| Bonds / cash | 10% short-term Treasuries | 10% short-term bonds |
Frequently Asked Questions
Did Warren Buffett really recommend a 90/10 portfolio?
Yes, with an important caveat. In his 2013 Berkshire Hathaway shareholder letter, Buffett described leaving instructions for a trust benefiting his wife: 90% in a low-cost S&P 500 index fund and 10% in short-term government bonds. It was guidance for that specific situation, not a blanket recommendation for everyone, but it has become a popular model for an aggressive, simple allocation.
Is 90/10 too risky for most people?
It is on the aggressive end. A 90/10 portfolio falls almost as much as an all-stock portfolio in a crash, around 45% versus 50%, so it suits only investors with a long horizon and the discipline to hold through deep losses. Those near retirement or prone to panic-selling should hold more bonds. The right mix depends on your time horizon and behavior, not on copying a famous investor.
What is the point of the 10% in bonds if it barely cushions losses?
Its main job is not to reduce drawdowns but to provide spendable, stable assets during a downturn so you never have to sell stocks at the bottom. Buffett framed the bond sleeve this way: it lets the 90% equity portion ride out a crash untouched while you draw on the bond portion for cash needs. For an accumulator, it also gives a little dry powder to rebalance.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.