Earnings Yield Spread

What Is the Earnings Yield Spread?

The earnings yield spread (EYS) measures the gap between the forward earnings yield of an equity index — typically the S&P 500 — and the nominal yield on the 10-year US Treasury. The earnings yield is simply the inverse of the forward price-to-earnings ratio: if the S&P 500 trades at 20x forward earnings, the earnings yield is 5.0%. If the 10-year Treasury yields 4.5%, the EYS is +0.5%, suggesting equities offer only a thin premium over risk-free bonds on this measure.

The concept gained widespread use as the "Fed Model" — a term coined by market commentators interpreting a 1997 Fed Humphrey-Hawkins report — which posited that equity markets are fairly valued when the earnings yield equals the long-term bond yield. A positive spread favors equities; a negative spread suggests bonds are relatively more attractive. It functions as a rough proxy for the equity risk premium and is used extensively in asset allocation frameworks.

Why It Matters for Traders

The EYS is a primary tool for cross-asset relative value positioning — specifically, tactical allocation shifts between equities and fixed income. When the spread compresses toward zero or turns negative, it signals that the equity risk premium is historically thin, historically associated with periods of equity underperformance or elevated drawdown risk over the subsequent 12-24 months.

For macro traders, the spread provides context for understanding sector rotation and great rotation narratives: as rates rise sharply (as in 2022), the spread compresses, making bond yields increasingly competitive versus equity earnings yields, creating valuation headwinds for equities even if earnings remain stable. The EYS also interacts with real yields — rising real yields are particularly corrosive to the spread since they raise the risk-free hurdle without the inflation offset that higher nominal yields might imply.

How to Read and Interpret It

Historical ranges for the S&P 500 EYS versus the 10-year Treasury:

• EYS > +3%: Equities historically cheap versus bonds — strong mean-reversion signal toward equities.
• EYS +1% to +3%: Neutral to modestly favorable for equities; typical post-GFC regime.
• EYS 0% to +1%: Warning zone — equities pricing in significant growth premium with little margin of safety.
• EYS < 0% (negative): Rare in modern history outside of bubble peaks; bonds offer higher income yield than the equity earnings yield, historically preceding poor equity forward returns.

As of late 2023, with the 10-year Treasury near 4.7-5.0% and S&P 500 forward earnings yield around 4.5-4.8%, the EYS was close to zero or negative — a historically unusual configuration last seen meaningfully in the early 2000s.

Historical Context

Between 2010 and 2021, the EYS averaged approximately +3 to +4 percentage points as near-zero interest rates made equities structurally cheap on this measure, supporting the TINA (There Is No Alternative) narrative. The spread collapsed from roughly +3.5% in early 2022 to near 0% by late 2023 as the Fed raised rates by 525 bps — the fastest tightening cycle since the 1980s. This compression contributed directly to the 40%+ drawdown in long-duration growth equities (Nasdaq) in 2022 even as aggregate S&P 500 earnings remained resilient, illustrating that valuation de-rating driven by EYS compression can dominate earnings fundamentals in a rate-shock environment.

Limitations and Caveats

• Inflation matters: Earnings are a real claim on assets whereas nominal bond yields are not inflation-adjusted. Comparing nominal earnings yield to nominal bond yield conflates real and nominal concepts, which is why the model has theoretical critics.
• Earnings quality: Forward earnings estimates are consensus analyst forecasts, subject to systematic upward bias — overstated earnings yields inflate the apparent spread attractiveness.
• The model failed spectacularly in Japan: Japanese equities traded with a deeply positive EYS for decades without providing equity outperformance, suggesting structural factors can override the valuation signal indefinitely.
• The spread is a valuation tool, not a timing tool — the EYS can remain at extreme levels for years before mean-reverting.

What to Watch

• Track the 10-year real yield via TIPS markets — real yield moves are more directly comparable to equity earnings yields.
• Monitor earnings revisions breadth to assess whether the earnings yield denominator is stable or deteriorating.
• Watch equity risk premium compression as a related concept capturing the full risk premium including growth, quality, and liquidity premiums beyond the simple EYS.