The S&P 500 Is Trading at 22× Earnings. Can Corporate Profits Justify It?

KEY POINTS

• The S&P 500 is trading at roughly 22× forward earnings, well above its long-term average.

• Elevated valuations aren't necessarily a problem if corporate earnings continue growing rapidly.

• AI-related investment and strong profit growth are supporting the bullish case.

• The biggest risk is that earnings expectations fall while valuations remain elevated.

The stock market has been remarkably resilient.

Despite persistent inflation, elevated interest rates and plenty of geopolitical uncertainty, the S&P 500 has continued to trade near record levels.

But there's one number that deserves investors' attention:

22.

That's roughly how many dollars investors are currently paying for every dollar of expected S&P 500 earnings over the next year.

By historical standards, that's expensive.

And it raises an important question:

Can corporate profits actually grow fast enough to justify it?

Stocks Aren't Cheap

There are several ways to value the stock market, but the price-to-earnings ratio remains one of the simplest.

A lower P/E generally means investors are paying less for each dollar of earnings.

A higher P/E means investors are paying more.

The S&P 500's forward P/E is currently around 22×, compared with a long-term historical average closer to the high teens.

That doesn't automatically mean stocks are about to crash.

Markets can remain expensive for years.

But it does mean investors are paying a premium for future earnings growth.

And the higher the valuation, the less room there is for disappointment.

Earnings Are Doing the Heavy Lifting

The strongest argument for today's valuation is simple:

Corporate earnings are growing.

FactSet's latest estimates call for S&P 500 earnings growth of roughly 13% in 2026, with double-digit earnings growth expected to continue into 2027.

That's significantly stronger than the earnings growth investors have historically received from the broader market.

If companies can deliver that kind of growth, a 22× multiple becomes easier to defend.

Think of it this way.

If earnings grow rapidly, today's high stock prices can eventually look much more reasonable because the underlying companies become more profitable.

That's the bull case.

But it comes with a catch.

Those earnings forecasts are expectations, not guarantees.

The AI Trade Is Doing a Lot of the Work

Much of the optimism surrounding earnings is concentrated in the technology sector.

The AI investment boom has created enormous demand for semiconductors, data centers, networking equipment and cloud infrastructure.

Companies such as Nvidia have become some of the largest contributors to S&P 500 earnings growth.

The bullish argument is that we're still early in the AI investment cycle.

If businesses continue spending heavily on AI infrastructure and eventually generate significant productivity gains from those investments, corporate profits could continue expanding at an unusually fast pace.

That would give investors a fundamental reason to pay higher multiples.

But there's another possibility.

Companies could spend enormous amounts on AI infrastructure without generating profits quickly enough to justify the investment.

If that happens, earnings expectations could eventually come down.

And that's where a 22× valuation becomes much more uncomfortable.What Happens If Earnings Miss?

This is the biggest risk facing the market.

Imagine investors are willing to pay 22× earnings because they expect profits to grow 13%.

If earnings growth comes in at 5% instead, investors may decide they don't want to pay the same multiple.

You could therefore get a double hit:

Lower earnings + a lower P/E multiple.

That's how expensive markets can fall quickly.

It doesn't require the economy to enter a recession.

Sometimes all it takes is for investors to realize that future growth won't be quite as strong as they expected.

There's Another Side to the Valuation Story

The 22× figure also needs some context.

The S&P 500 today isn't identical to the S&P 500 of 20 or 30 years ago.

Technology companies make up a much larger portion of the index.

Many of today's largest businesses have extremely high margins, strong balance sheets and enormous global customer bases.

Companies like Microsoft, Apple, Alphabet and Nvidia are fundamentally different businesses from many of the companies that dominated the index decades ago.

That could justify some valuation premium.

The question is how much of a premium?

That's where reasonable investors can disagree.

What Investors Should Watch

The most important number isn't actually the S&P 500's P/E ratio.

It's the relationship between price and earnings growth.

If earnings continue growing at a double-digit pace, today's valuation could eventually look much less extreme.

But if earnings growth slows while investors continue paying 22× or more, the market becomes increasingly vulnerable to a correction.

That means investors should pay close attention to quarterly earnings, forward guidance and analysts' earnings estimates.

Especially for the handful of mega-cap companies responsible for a huge share of the market's profits and returns.

The market doesn't necessarily need to become cheap.

It just needs earnings to grow into the price.

And right now, Wall Street is betting heavily that they will.