There is no single cutoff that proves the S&P 500 is “overvalued.” A better assessment compares several valuation measures—each tied to a different earnings period, payout measure, or cash flow—with its own dated historical reference. Those measures can show that stocks are expensive relative to fundamentals, but they cannot tell you when prices will fall or predict next year’s return.
Start with what “expensive” means
A valuation metric relates the price investors pay for stocks to a measure of what companies earn or distribute. The answer depends on which fundamental measure you choose and the date of the data. A near-term earnings forecast, a decade of past earnings, dividends, and bond yields answer different questions; they should be read together rather than treated as interchangeable verdicts.
For each figure, note the data provider, observation date, calculation, and historical comparison period. Compare like with like: a reading from one provider or series may not be directly comparable with another provider’s figure or a differently calculated historical average.
What each valuation metric tells you
| Metric | What it compares | What it helps answer | Main limitation |
|---|---|---|---|
| Forward P/E | Index price relative to expected earnings over the next 12 months | How much are investors paying for near-term earnings expectations? | Analyst forecasts can be wrong or revised. |
| CAPE (Shiller P/E) | Price relative to a 10-year average of inflation-adjusted earnings | Is price high relative to a longer earnings history that smooths some business-cycle swings? | It can respond slowly to change, and historical earnings may not match today’s business mix or payout practices. |
| Dividend yield | Expected dividends relative to current price | How much expected dividend income does the price represent? | Dividends can change and exclude share repurchases. |
| Earnings-yield spread | Forward earnings yield—the inverse of forward P/E—minus a selected bond yield | How does the earnings yield compare with a bond-rate reference? | Unlike a bond coupon, earnings yield is not a promised payment; the spread is only a rough comparison. |
| Free-cash-flow lens | Cash available after investment relative to market value, using a chosen data series | Does a cash-flow measure change the valuation picture? | Definitions and data coverage vary, so this is not an uncontested replacement for earnings-based measures. |
Forward P/E: the near-term forecast
Forward price-to-earnings (P/E) divides an index’s price by expected earnings, typically for the next 12 months. It provides a view based on analyst expectations rather than earnings already reported, so changes to those forecasts can move the ratio even if the index price does not. The Federal Reserve Board’s November 2025 Financial Stability Report said the S&P 500 forward P/E remained well above its historical median; that is a dated observation, not a live reading.
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CAPE: a longer earnings window
The cyclically adjusted price-to-earnings ratio, commonly called CAPE or the Shiller P/E, compares price with a 10-year average of inflation-adjusted earnings. Smoothing earnings over a longer period can reduce reliance on an unusually strong or weak single year. The trade-off is that the measure may take time to reflect changes in the composition of businesses or how companies return capital to shareholders.
Dividend yield: income, not total shareholder returns
Dividend yield relates expected dividends to the current price. A lower yield can accompany a higher price relative to dividends, but it does not capture share repurchases, and expected dividends can change. It is one income-related perspective, not a complete measure of the value investors receive.
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Earnings yield and bond-rate context
Earnings yield is the inverse of P/E: for example, a P/E of 20 corresponds to an earnings yield of 5%. Comparing that yield with a bond yield can provide context for the return investors may require from stocks. The Federal Reserve describes the comparison of earnings yield with a real Treasury yield as a crude measure of the extra return investors require to hold stocks rather than risk-free bonds. It is not a full equity-risk model: company earnings are uncertain, and an earnings yield is not a bond’s guaranteed coupon.
Free cash flow as a cross-check
A free-cash-flow measure offers another way to consider what remains after companies invest in their businesses. Its usefulness depends on how cash flow and market value are defined and which companies the data cover. Share repurchases also matter when interpreting CAPE and other measures that focus on earnings or dividends. The Federal Reserve Bank of Minneapolis discusses both the cash-flow perspective and the role of repurchases; neither point makes free cash flow a universally accepted substitute for earnings-based valuation.
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The following figures come from J.P. Morgan Asset Management’s U.S. equity-market valuation table, reproduced in Mississippi PERS investment committee materials in April 2026. They describe the market as of March 31, 2026; they are not current readings for October 7, 2026.
| Measure | March 31, 2026 reading | 30-year average | What the comparison indicates |
|---|---|---|---|
| Forward P/E | 19.7x | 17.2x | Above its stated average |
| Shiller P/E / CAPE | 37.2x | 28.7x | Above its stated average |
| Dividend yield | 1.6% | 2.0% | Below its stated average |
| Forward earnings yield minus Baa corporate bond yield | -0.3% | 0.7% | Below its stated average |
These four comparisons point toward higher valuations relative to the table’s own 30-year reference values, but they do not mean the metrics measure the same thing. The forward P/E uses expected near-term earnings; CAPE uses a long earnings history; dividend yield focuses on expected dividends; and the spread compares forward earnings yield with a Baa corporate bond yield. The last is not the same comparison as the Federal Reserve’s earnings-yield minus real Treasury-yield measure.
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How to assess a new valuation reading
- Write down the observation date and provider. A valuation number without both can be mistaken for a live market reading or compared with an incompatible series.
- Check the definition and horizon. Confirm whether the P/E uses forecast or reported earnings, whether CAPE uses inflation-adjusted 10-year earnings, and which bond yield is used in any spread.
- Compare each metric with its own dated history. Use the same provider’s calculation and note whether the reference is an average or median and the period it covers.
- Look for agreement and differences. Several measures can suggest elevated valuations while still disagreeing about the relevant earnings horizon, income stream, or rate comparison.
- Keep the conclusion proportional. Describe what the ratios say about price relative to their chosen fundamentals; do not turn them into a short-term forecast.
What valuation can—and cannot—tell you
High valuation readings describe the price investors are paying relative to a selected measure of fundamentals. They do not establish when a decline will happen, whether one is imminent, or what the market will return over the next year. Forecast revisions, future earnings, changing business composition, and companies’ use of dividends versus repurchases all affect how the measures should be interpreted.
The cited materials do not establish a live S&P 500 valuation reading for October 7, 2026. Any “today” figure needs a source with a matching observation date, along with its calculation and historical comparator.
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Sources
- Federal Reserve Board, Financial Stability Report, November 2025 (asset valuations and earnings-yield context).
- J.P. Morgan Asset Management, U.S. equity-market valuation measures, reproduced in Mississippi PERS investment committee materials, April 2026 (figures as of March 31, 2026).
- Federal Reserve Bank of Minneapolis, 2026 (CAPE, free cash flow, and share repurchases).
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