Will the U.S. invade Iran before 2027?

Platform comparison

Market context

The United States has already launched a major joint military offensive with Israel against Iran, known as Operation Epic Fury, which began on 28 February 2026 and involved nearly 900 strikes targeting Iranian leadership, nuclear sites, and missile infrastructure[5][8]. This conflict, which concluded on 5 May 2026, fundamentally alters the premise of any market asking if the US will invade Iran before 2027, as a full-scale offensive intended to degrade the regime has already occurred[5].

Historical precedents such as the 2003 Iraq invasion and the 2026 operation itself suggest that while air campaigns are frequent, ground invasions to establish territorial control remain rare due to geopolitical costs and the resilience of Iranian defences[5][10]. The current 12% crowd-implied probability likely reflects uncertainty over whether the US will transition from the existing air campaign to a ground occupation, a shift that contradicts the limited scope of Operation Epic Fury which focused on strikes rather than annexation[5][10].

Traders should monitor White House announcements regarding the deployment of ground troops, as recent reports indicate President Trump is considering further kinetic actions to force nuclear compliance[2][3]. Key catalysts include scheduled US military rotations in the Persian Gulf and any shifts in Iran’s nuclear fortification efforts, which have intensified with concrete coverings and tunnel reinforcements since February 2026[3]. The divergence between Polymarket’s 100% probability for strikes in February 2026 and this market’s 12% for invasion highlights that the crowd distinguishes clearly between air strikes and a ground invasion[1][5].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Will the U.S. invade Iran before 2027? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Best Prediction Markets UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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 Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.