6% — Will the US officially declare war on Iran by...
Polymarket 6% · 1 contracts · $1K volume · low confidence
Updated 2026-06-21 08:16:33 UTC

Why this matters:
This probability represents the likelihood that the U.S. government formally issues a declaration of war against Iran by an unspecified end date. At 8%, the market reflects skepticism about such an extreme escalation, despite current tensions. The level is driven primarily by two competing dynamics: regional instability and ongoing diplomatic channels remain active, while military posturing and rhetoric from various parties create downside risk. The key catalyst for repricing would be a major military incident—such as an Iranian attack on U.S. forces or allies, or verified credible intelligence of imminent Iranian action—that creates pressure for immediate congressional action. Without such a triggering event, inertia favors continued containment strategies over formal war declarations, which require explicit congressional authorization and represent a significant political commitment.

Key factors:
- Current U.S. military presence in the Middle East and stated deterrence posture against Iranian regional activities
- Status of ongoing diplomatic negotiations or sanctions regimes—whether escalating or stabilizing
- Iranian military capabilities and recent provocative actions or statements indicating intent to escalate
- Congressional appetite for war authorization given historical reluctance post-2003 Iraq invasion
- Regional proxy activities by Iranian-backed forces and potential for uncontrolled escalation from incidents

Contracts:
- Will the US officially declare war on Iran by...?: December 31 — 6¢ Polymarket $1K (weight 100%)

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## Methodology

SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours.

## SF Signal

- SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration.
- No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only.

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*Last verified: 2026-06-19T01:20:20.801Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "6% per prediction markets (SimpleFunctions, June 2026)"
Canonical: https://simplefunctions.dev/answer/us-officially-declare-war-iran
Full data: https://simplefunctions.dev/api/public/query?q=Will%20the%20US%20officially%20declare%20war%20on%20Iran%20by...
Provider: SimpleFunctions — https://simplefunctions.dev