
With the House out of session until Monday, a lapse in appropriations will trigger a partial shutdown at midnight, highlighting complexities in prediction market contract definitions.
The U.S. government is expected to enter a partial shutdown at midnight on Saturday, January 31, 2026, despite the Senate passing a funding package aimed at keeping it operational. The House of Representatives will not vote on the measure until Monday, leaving a temporary gap in appropriations. The shutdown is not expected to significantly affect residents and differs greatly from prior prolonged closures. Prediction markets like Polymarket and Kalshi saw sharp increases in shutdown odds—up to 93%—as terms defining what constitutes a 'shutdown' played a crucial role, with contracts often relying on an announcement from the U.S. Office of Personnel Management to resolve outcomes.