Why the S&P 500 Could Face a Sharp Drop in 2026

The S&P 500 is navigating a complex landscape. The economic impact of President Trump's tariffs, combined with high stock market valuations and the uncertainty of midterm elections, could trigger a significant decline or even a crash in 2026. For investors, understanding these interconnected risks is crucial.

President Trump's trade policies, including tariffs, are a central factor in the economic outlook for 2026.

Trump's Tariffs: Economic Claims vs. Reality

In a January editorial for The Wall Street Journal, President Trump argued that his administration's tariffs have fueled "extraordinarily high economic growth." He also claimed that foreign exporters are footing the bill. However, a closer look at the data suggests a different narrative.

Deconstructing 2025 GDP Growth

The assertion of tariff-driven growth doesn't align with economic figures. Here’s a breakdown of the first nine months of 2025:

• Underwhelming Performance: Real GDP grew by 2.51%. This rate is actually below the 10-year average (2.75%), the 30-year average (2.58%), and the 50-year average (2.84%).

• The AI Factor: According to the Federal Reserve Bank of St. Louis, spending on artificial intelligence (AI) contributed 0.97 percentage points to GDP growth during this period. Without the boost from AI, the economy would have expanded by just 1.54%. Goldman Sachs noted that without AI, "U.S. GDP would have almost flatlined."

Who Really Pays for the Tariffs?

President Trump’s editorial also stated that foreign producers are absorbing "at least 80% of tariff costs," citing a Harvard Business School study. This appears to be a misinterpretation of the research.

The study he referenced explicitly concludes, "Our results suggest that U.S. consumers paid up to 43 percent of the tariff burden, with the rest absorbed by U.S. firms." The report does not suggest that foreign exporters paid a substantial portion of the tariffs.

The takeaway is clear: contrary to claims, GDP growth in 2025 was subpar and heavily propped up by AI investment, not tariffs.

Historical Headwinds for the Stock Market

Beyond the tariff debate, two historical patterns are signaling caution for the S&P 500 in 2026: elevated valuations and the midterm election cycle.

A Market Priced for Perfection

The S&P 500 currently trades at 22.2 times forward earnings, according to FactSet Research. This is a very expensive valuation from a historical perspective. In the last 40 years, the index has only sustained a forward price-to-earnings (P/E) ratio above 22 during two periods: the dot-com bubble and the COVID-19 pandemic. Both were followed by bear markets.

This high valuation is particularly risky because the forward P/E metric already incorporates Wall Street's optimistic expectations for accelerated earnings in 2026. If companies fail to meet these high forecasts as tariffs weigh on the economy, stocks could fall sharply.

Midterm Election Year Jitters

History shows that midterm election years often bring market volatility. The S&P 500 has experienced a median intra-year drawdown of 19% in these years. This pattern suggests there is a 50/50 chance the index could see a similar decline in 2026.

This volatility stems from the uncertainty that midterm elections create. The party in power typically loses seats in Congress, leaving investors to speculate about future fiscal, trade, and regulatory policies.

The Bottom Line for Investors

The stock market faces a convergence of headwinds in 2026. The combination of high valuations, the economic drag from tariffs, and the historical uncertainty of a midterm election year raises the probability of a bear market or even a crash.

However, there is a silver lining for long-term investors. Every past market drawdown has ultimately proven to be a buying opportunity, and there is no reason to believe this time will be different.