Will the U.S. invade Iran before 2027?

Platform comparison

Market context

The question centres on whether the United States will initiate a military campaign designed to seize territory within Iran's borders before the end of 2026. This differs materially from strikes on Iranian military assets or proxies; the resolution criterion requires an offensive with the stated intent to establish control over Iranian land. The 12% probability reflects a low but non-negligible tail risk, consistent with assessments that direct US–Iran conflict remains unlikely under current conditions but remains within the realm of geopolitical possibility.

Historical precedent shapes how traders should calibrate this probability. The 2003 Iraq invasion occurred amid sustained diplomatic breakdown, explicit regime-change rhetoric, and a post-9/11 security environment. The 1991 Gulf War involved a coalition response to cross-border invasion of Kuwait, not unilateral territorial seizure. Neither the Obama nor Trump administrations, despite tensions and proxy conflicts, crossed into direct territorial conquest. The Biden administration has emphasised deterrence and containment rather than offensive operations. A shift to invasion would require either a major escalation trigger—such as a successful Iranian nuclear weapons test or a catastrophic attack on US personnel—or a significant change in executive strategy, neither of which current reporting suggests is imminent.

Traders should monitor several dependencies: Iranian nuclear programme developments, particularly IAEA inspection access and enrichment levels; statements from the incoming US administration regarding Iran policy; regional proxy activity in Iraq, Syria, and the Levant; and any major terrorist attack attributed to Iranian actors. The CFTC's reach into US-domiciled prediction market operators means this market's accessibility varies by jurisdiction; UK traders under GlüStV rules may face different KYC thresholds, whilst US traders on compliant platforms typically encounter no-KYC access up to $1,500 notional exposure, a practical ceiling that shapes retail participation in lower-probability geopolitical events.

Methodology

We track Will the U.S. invade Iran before 2027? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Tax UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket Tax UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on Polymarket Tax UK?

Zero. Polymarket Tax UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.