Statewide
Proposition 136Income Tax Rate Limit
Sourced facts
Official ballot title
Shall there be a change to the Colorado Revised Statutes capping the state income tax rate at 4.4% of federal taxable income for individuals and corporations?
Verbatim from: Amendments and Propositions on the 2026 Ballot (Colorado Secretary of State)
Summary
Sets 4.4 percent, the current rate, as the maximum state income tax rate in statute for individuals and corporations.
Plain-language summary written for this guide from the sources below.
What a YES vote does
A “yes” vote on Proposition 136 establishes the current state income tax rate of 4.4 percent as the maximum rate.
What a NO vote does
A “no” vote on Proposition 136 keeps the current state income tax rate of 4.4 percent without establishing a new limit in statute.
Official text from the Blue Book (“What Your Vote Means”).
How it got on the ballot
- Citizen initiative petition #232. The Secretary of State found the petition sufficient on Aug 20, 2026. [Colorado Secretary of State: 2025–2026 initiative filings and petition status]
- Signatures: 184,454 submitted; verified by random sample. [Colorado Secretary of State: 2025–2026 initiative filings and petition status]
- Requirement: 124,238 valid signatures. Initiatives that amend the Colorado Constitution must also include signatures from at least 2% of registered voters in each state Senate district. [Colorado Secretary of State: 2025–2026 initiative filings and petition status]
- Certified to the ballot by the Secretary of State Sept 4, 2026. [SOS ballot certification news release, Sept 4, 2026]
Official fiscal information
- “This results in no change to state or local government revenue or spending. For this reason, the measure has no fiscal impact.”
From the official source’s fiscal section. Figures marked “(Estimated)” are estimates or projections in the source.