Colorado Personal Tax Extension 2026: 2025 Tax-Year Filing Guide
Individual Income Tax · Colorado 104 · 104PN · 104
This guide explains the Colorado personal tax extension for the 2025 tax year. Most individuals receive an automatic extension to October 15, 2026, but payment is still due by April 15, 2026. For federal filing details, see our federal tax extension resources.
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Colorado (CO) gives most individuals an automatic filing extension. File by October 15, 2026, and pay any Colorado tax owed by April 15, 2026.
Colorado Personal Tax Extension: Filing Details
Colorado generally grants an automatic six-month extension for individual income tax returns. The extended filing deadline for a 2025 calendar-year return is October 15, 2026.
The extension applies to filing time only. Pay any balance due by April 15 to limit penalties and interest.
Quick Reference: Deadlines and Forms
Use this summary to confirm Colorado personal filing deadlines, return forms, and payment requirements.
| Item | Colorado personal return | Deadline or method |
|---|---|---|
| Original deadline | 2025 Colorado return | April 15, 2026 |
| Extended deadline | Automatic extension | October 15, 2026 |
| Return forms | 104, 104PN, 104 | Use the form for your filing status |
| Payment form | DR 0158 | Payment remains due April 15 |
Frequently Asked Questions
Answers about Colorado personal tax extensions. Confirm current rules with the Colorado Department of Revenue.
Visit Colorado Revenue Online →Most individuals receive an automatic Colorado extension and do not need to submit a separate extension form. The extension moves the filing deadline to October 15, 2026, but payment remains due April 15, 2026. For business filings, see our Colorado business tax extension page.
No. Colorado tax is due by April 15, 2026. Pay through My Colorado Taxes or use the applicable payment method to limit penalties and interest.
For most 2025 calendar-year individual returns, the Colorado extended filing deadline is October 15, 2026. Check the current Colorado Revenue Online individual filing guidance if your circumstances differ.