Colorado DOR Proposes Rule Mandating Electronic Filing, Payment of Motor Fuel Tax

December 19, 2025, 7:42 PM UTC

The Colorado Department of Revenue (DOR) proposed a rule mandating electronic filing and payment for the International Fuel Tax Agreement (IFTA) tax report and motor fuel tax. The proposal establishes a phased implementation of electronic filing requirements based on total miles traveled by IFTA licensees. [Colo. Dep’t of Revenue, Proposed Reg. Section 39-21-119.5 - 6, 12/15/25]

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