Deadline extended! The state-collected sales tax filing and payment deadline for January 2026 has been extended to March 2, 2026.

 
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DR 0105 - Fiduciary Income Tax Return (form only)

Every resident estate or trust and nonresident estate or trust with Colorado-source income must file a Colorado fiduciary income tax return if it is required to file a federal income tax return or if it has a Colorado tax liability.