Resolution. Resolves YES if the OBR's October 2026 Economic and fiscal outlook states a margin of £10.0 billion or more against the current budget (stability) rule in the rule's target year, after Budget measures, as printed in the outlook's executive summary. If it reports margins for more than one year, the target year named in the fiscal mandate governs. Resolution Foundation estimated about £5bn before any Budget measures on 7 September 2026.

This market closes at 12:00 UTC on Budget day, 30 minutes before the speech is due to begin, because measures resolve as the Chancellor announces them.

If the Budget moves to another date in 2026, this market follows it and the close time moves with it. If no Budget is delivered by 31 December 2026, resolves N/A. Created by Max Ghenis of PolicyEngine (https://www.policyengine.org/uk) as a public record of what PolicyEngine expected before the Budget. The creator may trade in this market; resolution follows the published Budget documents.