- Will the US officially declare war on Iran by December 31, 2026?4¢
This market will resolve to "Yes" if the United States formally declares war on Iran through an act of Congress between market creation and the specified date, 11:59 PM ET. Otherwise, this market will resolve to "No." To qualify, Congress must pass a formal declaration of war, consistent with its constitutional authority under Article I, Section 8. Authorizations for the use of military force (AUMFs), executive orders, presidential statements, or military actions do not qualify unless accompanied by a formal declaration of war enacted by Congress and signed into law. The resolution source will be a clear consensus of credible reporting.
Ongoing US-Iran hostilities, initiated with joint US-Israeli strikes on February 28, 2026, have relied on executive authority and War Powers notifications to Congress rather than a formal declaration. Military operations, including air and naval strikes, a blockade of Iranian ports, and pressure over the Strait of Hormuz, continue amid a collapsed June memorandum of understanding and renewed July escalations. Congressional votes to restrict or end involvement have passed the House but face Senate hurdles, while sanctions and diplomatic backchannels with mediators remain active. Trader consensus assigns low probability to an official congressional declaration by year-end because Article I requirements, partisan divisions, and preference for calibrated force make such a step structurally and politically difficult absent a major new catalyst within the resolution window.