NEWS BRIEF
Colorado Public Radio reports that Proposition 136 would set a 4.4% ceiling on Colorado individual and corporate income tax rates, based on federal taxable income, beginning with the 2027 tax year if voters approve it. The November ballot measure would keep the cap in place unless voters later change it through another ballot measure. Supporters say it would protect limits on tax increases, while opponents favor Amendment 87, a proposed graduated income-tax measure, and argue the cap would constrain future state revenue.
What to know
If approved, Proposition 136 would prevent Colorado’s individual and corporate income tax rates from exceeding 4.4% starting in 2027. The proposal would not change the rate by itself, but would limit future increases unless voters approve a later ballot measure.
Reporting: John Daley · Colorado Public Radio · 09-25-2026
