Colorado Tax Guide (2026)
Comprehensive statutory analysis of Colorado individual income tax rates, Department of Revenue filing forms, extension guidelines, telecommuting sourcing rules, and pass-through entity tax provisions.
Key Statutory Tax Parameters (Colorado, 2026)
2026 Legislative & Statutory Highlights
Colorado features a flat individual income tax rate of 4.40%, mandated by Article X, Section 20 of the Colorado Constitution (the Taxpayer's Bill of Rights, or TABOR). Under TABOR, state revenues exceeding statutory expenditure limits are returned to taxpayers via temporary rate reductions or uniform TABOR sales tax refund credits.
Colorado operates a flat personal income tax schedule with a statutory flat rate of 4.4%. Tax parameters are indexed annually or enacted through state legislative sessions. Taxpayers should ensure that adjustments for federal bonus depreciation, Section 179 expensing, and Net Operating Loss (NOL) carryforwards follow Colorado's specific rolling or static Internal Revenue Code conformity date.
Filing Forms, Deadlines & Extension Guidelines
Multi-State Workers & Telecommuting Sourcing Rules
Colorado taxes residents on worldwide income. Nonresidents who telecommute or travel into Colorado for temporary business engagements are subject to Colorado tax on wages earned for days physically present in Colorado, subject to specific corporate sourcing and apportionment rules.
Pass-Through Entity (PTE) Tax & Small Business Rules
Colorado's SALT Parity Act (HB 21-1311 / HB 22-1025) allows pass-through entities to elect to pay Colorado income tax at the entity level at the state flat rate of 4.40%, enabling direct federal tax deduction offsets for partners and S-corp owners.
Estate & Inheritance Tax
Colorado imposes no state estate tax or inheritance tax.
Local & County Taxes
Several Colorado municipalities levy flat local occupational privilege taxes (OPT), such as Denver ($5.75/month paid by employees earning over $500, plus $4.00/month paid by employers).
Worked Tax Example: $120,000 W-2 Earner in Colorado
A single professional in Denver earning $120,000 in taxable income pays approximately $4,620 in Colorado state income tax under the 4.40% flat rate (after federal standard deduction parity adjustments), yielding an effective state rate of 3.85%.
Calculate Your 2026 Colorado Tax Liability
Enter your taxable income, filing status, and municipal details below to calculate your customized state tax liability and print your executive summary.
Single flat rate 4.40% (flat 4.40% for 2026; includes any scheduled temporary adjustments — verify against CO DOR).
2026 Executive Colorado State Tax Audit Summary
Not tax, legal, or financial advice
FiscTalk provides general educational information from public sources. Your tax results depend on the full set of facts, your filing history, and the jurisdiction-specific rules that shift yearly. Before filing or making decisions, consult a licensed CPA, EA, or attorney. FiscTalk is not a fiduciary and is not affiliated with the IRS or any state agency.
Sources & methodology
Frequently Asked Questions: Colorado Taxes
Source-verified — not professional advice
Every figure on this page is checked in-house against its primary source — IRS revenue procedures and publications, state Departments of Revenue, and the text of the underlying statute — before publication. Last reviewed 2026-10-20. The full source list is at the bottom of this page. If you spot an error, see our corrections & standards policy.
Not tax, legal, or financial advice
FiscTalk provides general educational information from public sources. Your tax results depend on the full set of facts, your filing history, and the jurisdiction-specific rules that shift yearly. Before filing or making decisions, consult a licensed CPA, EA, or attorney. FiscTalk is not a fiduciary and is not affiliated with the IRS or any state agency.
Sources & methodology