U.S. midterm scenarios and investment implications

The 2026 U.S. midterms are unlikely to derail markets, with a likely gridlocked Congress favoring the status quo but a Republican sweep posing upside-growth and inflation risks.

• Prediction markets assign a 90% probability to Democrats winning at least one chamber and around 30% to a split Congress, while the economy has remained resilient despite 23 months of policy uncertainty, stubborn inflation and high bond yields.
• In Russell Investments’ sample of midterms from 1998 to 2024, risk aversion fell by one standard deviation and the S&P 500 gained around 8% during the 180 days after the election, supporting continued investment and potential dip-buying before November 3.
• A divided government would probably produce legislative gridlock and preserve a status quo viewed as favorable for Corporate America, including record-low statutory tax rates; presidential authority over tariffs and deregulation would nevertheless remain significant.
• A Republican sweep could introduce $5,000 household dividends, a federal gas-tax holiday and sector-specific aid, supporting nominal growth but keeping inflation sticky and interest rates higher for longer.
• Data centers are becoming a political flashpoint: only one in six counties supports new projects, yet they generated 38% of Loudoun County, Virginia’s FY2026 revenue; permitting or grid-connection delays in Texas and Virginia could affect AI hardware demand, component prices, inflation and sovereign rates.

Takeaway: Investors should remain strategically invested and monitor the November 3 outcome, with the main 2027 risks being a Republican sweep that pressures rates through hotter inflation and political opposition that slows the AI data-center buildout.