Kalshi traders price 44% chance of US government shutdown on December 12

Traders on Kalshi are pricing a 44.2% chance that the US federal government will be shut down on December 12, 2026.

What the market is actually betting on

The contract hinges on a single moment. It resolves “Yes” only if a partial shutdown is in effect at 10:00 a.m. ET on December 12, 2026.

A shutdown also has to be official to count. The contract requires verification through directives from the Office of Management and Budget or the Office of Personnel Management at the time of closure.

That detail matters more than it sounds. A messy late-night vote that technically lapses funding for a few hours, then gets patched before the morning, would not trigger a payout. Traders are betting on a real closure, not a scheduling hiccup.

Kalshi’s market has been live since September 2026. Its pricing has recently sat in a range of roughly 41% to 45%, with 44.2% as the leading figure as of late November.

Cumulative trading volume on the December contract has topped $248,000. Recent daily activity runs at approximately $16,000 in volume, with around 16,000 contracts changing hands.

A deadline with a track record

The government is currently running on a stopgap. Funding is secured until December 11, 2026, under H.R. 6500, which took effect on September 2, 2026.

As of mid-November, Congress had not finalized any full-year appropriations bills.

The odds have not been static. Kalshi’s shutdown probability stood at 46% in late September, slid into the low 30s by late October, then climbed back above 40%.

That arc tracks the political calendar. The current stretch falls in the lame-duck session that follows the midterm elections, a period when outgoing members have less at stake and incoming ones have not yet arrived.

History is also weighing on sentiment. Two earlier 2026 funding deadlines, January 31 and February 14, both ended in shutdowns, and one of those lapses ran between 75 and 79 days.

Kalshi is not alone in reading the tea leaves this way. Polymarket, a competing prediction platform, has shown similar probabilities for shutdown outcomes.

Why the swings tell a story

The move from 46% down to the low 30s and back above 40% is a compact timeline of congressional mood. Optimism about a deal pulled prices down in October. Renewed doubt as the deadline approached pushed them back up.

The flip side is that thin markets can overreact. With daily volume in the low tens of thousands of dollars, a handful of large trades could nudge the price more than a broad shift in expectations would.

What this means

For Congress, the market is effectively a public scorecard. Lawmakers have until December 11 before current funding runs out, and no full-year bills had been finalized as of mid-November.

Any movement on a new stopgap or full-year appropriations package should pull the odds lower. Signs of renewed gridlock in the lame-duck session would push them back toward, or past, the 46% high seen in late September.

If Kalshi and Polymarket start to diverge meaningfully, it may suggest one market is reacting to information or positioning the other has not yet absorbed.