Colorado Income Tax 2026

Colorado has a flat 4.40% income tax for 2026. The standard deduction is $0 (single) / $0 (married filing jointly). Flat 4.40% individual income tax for tax year 2026 (statutory standing rate, down from prior 4.55%/4.50% via TABOR-driven reductions). TABOR surplus mechanisms can TEMPORARILY lower the rate further (e.g., to 4.25% in certain surplus years), but 4.40% is the baseline encoded for 2026. Colorado has NO separate state standard deduction or personal exemption: the state tax base STARTS from federal taxable income, which already reflects the federal standard deduction or federal itemized deductions, then applies Colorado-specific additions/subtractions. Standard deduction is therefore set to 0 intentionally. NO local or city income taxes (Denver/Aurora/Greenwood Village etc. impose a flat per-month Occupational Privilege Tax on employees/employers, but it is not an income tax). Social Security: residents 65+ can deduct ALL federally taxable Social Security benefits; ages 55-64 may deduct SS benefits subject to the pension/annuity income exclusion (up to $20,000 ages 55-64, up to $24,000 age 65+). Retirement/pension income exclusion of up to $20,000 (55-64) or $24,000 (65+) applies. Key credits: state EITC (percentage of federal EITC) and Child Tax Credit.