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90/10 Strategy: Definition, How It Works, Examples – Analytics & Forecasts – 2 February 2023

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How the 90/10 Strategy Works

A typical application of the 90/10 strategy involves the use of short-term Treasury Bills (T-Bills) for the 10%, fixed-income component of the portfolio. Investment of the remaining 90% is in higher-risk (but low-cost) index funds.

For example, an investor with a $100,000 portfolio electing to employ a 90/10 strategy might invest $90,000 in an S&P 500 index fund. The remaining $10,000 might go toward one-year Treasury Bills, which in our hypothetical scenario yield 4% per annum.

Of course, the “90/10” rule is merely a suggested benchmark, which may be easily modified to reflect a given investor’s tolerance to investment risk. Investors with lower risk tolerance levels can adjust lower equity portions to the equation.

For instance, an investor who sits at the lower end of the risk spectrum may adopt a 40/60 or even 30/70 split model. The only requirement is that the investor earmarks the more substantial portion of the portfolio funds for safer investments, such as shorter-term bonds that have an A- or better rating

Calculating 90/10 Strategy Annual Returns

To calculate the returns on such a portfolio, the investor must multiply the allocation by the return and then add those results. Using the example above, if the S&P 500 returns 10% at the end of one year, the calculation is (0.90 x 10% + 0.10 x 4%) resulting in a 9.4% return.

However, if the S&P 500 declines by 10%, the overall return on the portfolio after one year would be -8.6% using the calculation (0.90 x -10% + 0.10 x 4%).

Real-World Example of 90/10 Strategy

Buffett not only advocates for the 90/10 plan in theory, but he actively puts this principle into practice as reported in Berkshire Hathaway’s 2013 letter to shareholders. Most notably, Buffett uses the principle as a trust and estate planning directive for his wife, as laid out in his will:

My money, I should add, is where my mouth is: What I advise here is essentially identical to certain instructions I’ve laid in my will. One bequest provides that cash will be delivered to a trustee for my wife’s benefit. (I have to use cash for individual bequests, because all of my Berkshire shares will be fully distributed to certain philanthropic organizations over the ten years following the closing of my estate.) My advice to the trustee could not be more simple: Put 10% of the cash in short-term government bonds and 90% in a very low-cost S&P 500 index fund. (I suggest Vanguard’s.) I believe the trust’s long-term results from this policy will be superior to those attained by most investors—whether pension funds, institutions, or individuals—who employ high-fee managers.1

Special Considerations

There are variations of Buffett’s 90/10 investing strategy that take into consideration the investor’s age and risk tolerance. As an investor nears retirement, it’s frequently a good idea to rebalance a portfolio to reflect a more conservative approach toward investing. The investor’s need to protect their nest egg so they have funds to live on during retirement becomes paramount over the need for continuous growth. For this reason, the percentages in the investment strategy might change considerably.

One approach has the investor switching the allocations so that 90% of funds are put in low-risk government bonds and 10% are invested in index funds. Additionally, investors who are bearish may opt for these allocation amounts as part of a crash protection strategy.

Other approaches change the percentages for each investment type depending on the investor’s risk tolerance combined with other factors, such as their desire to leave an estate to their heirs or the availability of other assets they can draw upon during retirement.

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