Last mentioned: Mar 18, 2026
General Election
Colorado voters will decide the fate of the progressive tax initiative at the polls.
Ballot Certification
The Secretary of State must certify whether the measure has met the legal requirements to appear on the ballot.
Submission Deadline
Deadline for advocates to submit collected signatures to the Colorado Secretary of State for verification.
Signature Drive Launch
Supporters begin the formal process of collecting voter signatures across Colorado.
Advocacy groups in Colorado have officially launched a signature-gathering campaign for a 2026 ballot initiative aimed at increasing income taxes on the state's highest earners. The measure seeks to transition Colorado from its long-standing flat tax system to a progressive model to bolster funding for public services.