Will the U.S. invade Iran before 2027?

Platform comparison

Market context

A **YES** share pays out if the United States begins a military offensive intended to establish control over any part of Iran before the settlement deadline; a **NO** share pays out otherwise. In plain language, this market is not about isolated airstrikes alone, but about whether U.S. action crosses the line into an offensive aimed at taking or holding territory, which is a much higher bar than routine signalling or stand-off attacks.

That distinction matters because recent U.S.-Iran confrontation has already included large-scale operations. The U.S. began Operation Epic Fury on 28 February 2026, and official statements describe its aims as destroying Iranian missile systems, production, and naval/security infrastructure rather than occupying territory.[11][12] Reuters also reported in March that Defence Secretary Pete Hegseth said U.S. objectives had not changed, while sources said the Pentagon was weighing more troops and possible actions tied to the Strait of Hormuz.[8] For prediction markets, an 18% YES price implies the crowd sees escalation risk as real, but still treats a territorial invasion as unlikely compared with continued strikes, pressure, or limited maritime operations.

Traders should watch for any White House, Pentagon, or congressional language that shifts from deterrence and strikes to seizure, holding, or “control” of land, plus mobilisation steps such as a major ground-force deployment or amphibious planning. CNN reported on 3 August that the military had been asked for “creative and unconventional” ideas to punish Iran, and that planning included possible renewed strikes on remaining nuclear sites, which suggests escalation remains active even if invasion is not the stated aim.[6] News of carrier movements, troop surges, or a new authorisation from Congress would matter, because this market settles on a consensus reading of whether the U.S. actually commenced an offensive intended to establish control over Iranian territory, not simply whether tensions rose.[2][6]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Will the U.S. invade Iran before 2027? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

UK Frequently Asked Questions

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.