Why the S&P 500 Is Not Overvalued as of January 2026: A Rebuttal to Traditional Metrics

As of January 2026, a broad consensus among commentators and strategists holds that the S&P 500 is significantly overvalued. This view is based almost exclusively on traditional valuation metrics—high P/E ratios, elevated PEG ratios, and an earnings yield below the risk-free rate. This article argues that such conclusions reflect a methodological error rather than an economic fact. Static valuation multiples do not measure intrinsic value in a form that markets can arbitrate. When equity valuation is instead expressed in structurally coherent yield terms—specifically through SIRRIPA (Stock Internal Rate of Return Including Price Appreciation)—the U.S. equity market appears fairly valued relative to the prevailing risk-free rate. The apparent contradiction between “high prices” and “fair value” dissolves once valuation is framed correctly.