Equities • Valuation
Equity Risk Premium (ERP) Explained: Valuation & Returns
How the Equity Risk Premium measures excess expected equity returns, calculates hurdle rates, and signals market extremes.
Author: CMD Wire Institutional Research
Updated: August 2026 • 6 min read
1. What Is the Equity Risk Premium (ERP)?
The Equity Risk Premium (ERP) is the excess expected return that an investor demands for holding equities (stocks) over a risk-free benchmark asset (typically the 10-Year U.S. Treasury note).
Because equities carry business risk, leverage risk, and bankruptcy subordination, capital will only flow into stocks if the expected earnings return offers an adequate buffer above risk-free government debt.
2. Calculating the Implied Equity Risk Premium
A standard quantitative proxy used on institutional trading desks is the difference between the S&P 500 Earnings Yield (the inverse of the P/E ratio, $E/P$) and the 10-Year Nominal Treasury Yield ($Y_{10}$):
ERP ≈ (Forward EPS / S&P 500 Price) − 10-Year Treasury Yield
3. Historical ERP Regimes & Forward Returns
| ERP Regime | Spread Level | 5-Year Forward Equity Return Outlook |
|---|---|---|
| Attractive / High ERP | > 400 bps | Significantly above average forward returns (e.g. 2009, 2012, 2020 bottoms). |
| Fairly Valued | 200 – 350 bps | Moderate mid-single digit real annual returns. |
| Compressed / Low ERP | < 100 bps | Extremely vulnerable to multiple compression; cash/bonds offer superior risk-adjusted returns. |