Is the S&P 500 Overvalued?
By nearly every long-run gauge the S&P 500 is historically expensive. Here's where it sits versus its own history, why, and what that has meant for returns.
By nearly every long-run measure, yes — the S&P 500 is historically expensive in 2026, sitting in the top few percent of its own recorded history. As always, "overvalued" is not a sell signal or a crash forecast. It is a statement about how today's price compares with fundamentals and with the index's own past — and about the returns that have tended to follow from such levels.
The S&P 500 versus its own history
The S&P 500 is the US large-cap market, so the standard US valuation gauges measure it directly. As of mid-2026, almost all of them sit near record extremes:
| Gauge | Current | Where it sits |
|---|---|---|
| CAPE (10-yr cyclically-adjusted P/E) | ~41 | 99th percentile |
| Trailing P/E | ~28 | 96th percentile |
| Buffett Indicator (market cap ÷ GDP) | ~219% | 99th percentile |
| Price-to-book & price-to-sales | near highs | top of range |
| Dividend yield | ~1.3% | low (i.e. expensive) |
A CAPE near 41 is extraordinary: outside the brief peak of the late-1990s dot-com bubble, the S&P 500 has essentially never been more expensive on this measure. You can see all six gauges live, on one cheap-to-expensive scale, on the US valuation dashboard. (These figures move daily — treat the numbers above as a June 2026 snapshot.)
Why is it so expensive?
A few forces reinforce each other:
- Composition. The index is heavily weighted toward mega-cap technology firms with high margins and high growth expectations, which command premium multiples.
- Concentration. A handful of giant companies now drive a large share of the index's value and its valuation.
- A decade of low interest rates trained investors to pay up for equities when bonds yielded little — and those expectations are slow to unwind.
None of this makes a high valuation "justified" or "unjustified." It simply explains why the multiple is where it is.
What that has meant for returns
Here is the part that matters. Historically, the higher the S&P 500's starting CAPE, the lower its return over the following decade. At today's CAPE of roughly 41, that relationship points to a central estimate of about zero in real terms — near −0.2% a year after inflation over the next ten years — well below the long-run average of around 6–7%.
That is a central tendency, not a prophecy. The relationship is loose: it explains only about a quarter of the historical variation in 10-year returns, so the band around that estimate is wide (the model shows an upside scenario near +4% a year, with a comparable downside). Explore the full model and its uncertainty on the expected returns page.
The crucial caveat: this is not a market-timing tool. The S&P stayed expensive — and kept climbing — for years in the late 1990s before it finally corrected. A stretched valuation lowers the expected return and widens the range of bad outcomes; it does not set a date. We look at the predictive record honestly in does CAPE predict returns?.
The S&P 500 vs the rest of the world
The US is the most expensive major market by a wide margin. Much of the rest of the world — Europe, the UK, China and other emerging markets — trades at far lower multiples. If the S&P's valuation concerns you, that gap is exactly where the cheapest stock markets sit, and it's central to the global valuation picture too. For the worldwide view, see the companion piece, is the stock market overvalued?
So should you do anything?
This is general information, not financial advice. What the S&P's valuation is genuinely useful for is setting expectations — if your retirement plan quietly assumes 7% real returns from an index the data suggests may deliver close to zero, that is worth knowing now — and deciding your geographic mix, since cheaper markets abroad currently price in higher expected returns. What it is not useful for is timing the market. The evidence broadly favours staying invested and diversified over jumping in and out on a valuation signal.
Check the live numbers
- US stock market valuation — all six gauges for the S&P 500, against their own history.
- Expected returns — what today's CAPE has historically implied for the next decade.
- Cheapest stock markets in the world — where the cheaper opportunities are.
- Is the stock market overvalued? — the same question for world equities.