Colorado DOR Adopts Amended Rule on Electronic Tax Filing Requirements

March 16, 2026, 2:56 PM UTC

The Colorado Department of Revenue (DOR) adopted amendments to a rule governing electronic tax filing and payment requirements. The rule clarifies the requirements for electronic filing and payment of taxes, including how filing and payment dates are determined, the requirements for proof of submission, and penalties for non-compliance. [Colo. Dep’t of Revenue, Reg. Section 39-21-119.5 - 1, 02/27/26]

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