This market resolves YES if Washington Initiative IP26-645 (Initiative Measure No. IP26-645 concerns state and local taxes.) is approved by voters at the November 3, 2026 general election under its official approval rule:

Majority of votes cast on the measure, provided votes on it equal ≥1/3 of all votes cast at the election (Wash. Const. art. II §1(d)); effective 30th day after election (2026-12-03). Votes cast on the measure must equal at least one-third of total votes cast at the election (Wash. Const. art. II §1(d)).

Only the November 3, 2026 vote counts; earlier votes on similar proposals do not. YES means voter approval at this election, not that the measure is later implemented.

What the votes mean (official summary):

• YES: Repeals the 9.9% tax on income over $1,000,000 and prohibits state and local individual income taxes; related tax breaks in the 2026 law remain.

• NO: The 9.9% tax on annual individual income over $1 million (ESSB 6346, from 2028) stays in law.

Results: resolves on the result certified by Washington Secretary of State (certifies statewide results by 30th day after election, RCW 29A.60.250). It may resolve earlier once official returns or the Associated Press show the outcome cannot change and no recount is pending; if a recount or certified correction changes the outcome before resolution, the certified result controls.

No vote: if the measure is removed from the ballot, a court orders its votes not to be counted, or the vote is postponed beyond November 3, 2026, the market resolves N/A.

Later legal challenges: resolution follows voter approval as certified. A court later invalidating, enjoining or delaying the measure does not change the resolution.

Starting probability: 50% is a neutral starting seed, not a forecast.

Official source: https://www.sos.wa.gov/elections/data-research/election-data-and-maps/election-results-and-voters-pamphlets/2026-general-election-voters-guide