Colorado State Income Tax Brackets 2024 State.  — the tax information provided here is based on 2024 federal marginal rates and state tax rates.  — find colorado income tax forms, tax brackets, deductions, and rates by tax year.

 — effective january 1, 2024, the colorado individual income tax rate is temporarily reduced to 4.25%.  — the deadline for filing a colorado state tax return is april 15, 2024.