US Midterm Elections: Why They Matter for Markets

The 2026 US midterm elections could shape markets mainly through fiscal policy, regulation and the longer-term direction of US economic policy.

• Polls suggest Democrats may gain at least one chamber of Congress, while divided government remains a likely outcome; historically, divided government has often limited major policy shifts and supported markets.
• A shift of roughly 4 to 5 seats among approximately 29 competitive or toss-up House races could change control of the chamber, while a Democratic sweep would raise the focus on healthcare, affordability and consumer protection.
• Legislative gridlock could restrain new spending and reduce upward pressure on Treasury yields, although a year-end package could include defense, agriculture and infrastructure measures worth as much as 0.5% of GDP.
• The federal debt ceiling must be raised by next year, and the timing and political process could affect markets and potentially the government’s credit rating; inflation may remain difficult to reduce because energy supply disruptions linked to the Middle East war are driving part of the current surge.
• The election could influence the future regulation of AI, with a Democratic sweep potentially increasing scrutiny of data centers, while national-security concerns could favor lighter regulation to preserve US competitiveness with China.

Takeaway: Global investors should monitor the election result and any year-end spending agreement because the absence of such a package could produce 0.5% of fiscal tightening next year, affecting US growth, interest rates, inflation and the relative appeal of US and non-US assets.