Colorado voters narrowly approved a major overhaul of the state’s income tax system on November 3, 2026, replacing its flat 4.4% rate with a graduated structure that will cut taxes for most residents while raising rates on high earners. Amendment 87 also changes the state constitution, allowing Colorado to collect nearly $2 billion in additional annual revenue for education, health care and child care.
…
The proposal divided prominent Colorado Democrats. Gov. Jared Polis, Gov.-elect Phil Weiser and former U.S. Sen. Ken Salazar opposed the overhaul, citing concerns about its economic consequences. The Colorado Chamber of Commerce also warned that higher taxes could weaken the state’s competitiveness and discourage business investment.
Read more here.