Colorado e-File – Acks and Processing

The Colorado Department of Revenue (DOR) expects to begin issuing electronic filing acknowledgments (acks) for returns on or after the dates listed below: Individual and Corporate returns: January 26, 2026. S Corporation and Partnership returns: January 30, 2026. Fiduciary returns: February 4, 2026. While you will receive acknowledgments from the state, they will not begin processing e-filed returns until later. As a result: Acks for some returns may still be delayed or continue to show as pending during this initial period. Refunds will be delayed. Direct debit paymen...
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