Traders assign the highest odds to a government shutdown coinciding with Democratic control of the House in 2026 because ongoing disputes over appropriations bills and continuing resolutions have created repeated funding deadlines that test narrow congressional majorities. These probabilities reflect assessments of historical midterm dynamics, where the president's party often faces seat losses amid voter dissatisfaction with spending fights and fiscal policy. Recent legislative maneuvering around debt-ceiling adjustments and agency funding priorities has reinforced expectations that partisan standoffs could produce a lapse before the November elections, while Democratic challengers benefit from turnout patterns in swing districts. Any resolution of current budget measures or shifts in Senate leverage could still alter the balance before markets settle on the final outcome.