September Fed Rate Hike Odds Jump — Should Investors Still Buy the S&P 500?

The Quick Take

• The probability of a Federal Reserve rate hike in September increased sharply, raising questions about equity positioning at current market levels
• Higher interest rates historically pressure stock valuations by raising the discount rate and increasing competition from risk-free yields
• The Motley Fool analysis argues investors should assess whether the current S&P 500 entry level is justified given elevated rate hike risk

As the probability of a September Federal Reserve rate hike climbed sharply on the back of oil-driven inflation data, equity investors are reassessing whether the S&P 500 offers compelling value at current levels. The academic basis for concern is well-established: higher interest rates compress the present value of future earnings by raising the discount rate applied to cash flows, and simultaneously make risk-free assets like Treasury bills and money market funds more attractive alternatives to equities. This dual pressure on equity valuation multiples is the primary mechanism through which rate hike cycles create headwinds for the stock market.

Historical rate hike cycles offer mixed guidance for equity investors. The S&P 500 has sometimes continued rising through tightening cycles when earnings growth was strong enough to offset the valuation compression — but in the current environment, oil-driven inflation compresses corporate margins on the input cost side while simultaneously eroding consumer purchasing power. For long-term investors, the question of whether to buy, hold, or reduce exposure is largely a function of time horizon: short-term volatility is likely elevated, but investors with five or more years of time horizon have historically been rewarded for buying quality equities through rate cycles.

The forward signal for equity investors is the Fed's September dot plot, which will show the committee's projected terminal rate and guide expectations for the full cycle. If the dot plot signals one or two remaining hikes with a pause thereafter, markets would likely rally on the "peak tightening" thesis. If the dot plot shows continued hikes through 2027, the equity risk premium may need to compress further. Watch the 10-year Treasury yield relative to the S&P 500 earnings yield as the most direct valuation benchmark for whether equities remain cheap relative to bonds at current prices.

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